From efaec26b1d8aa9af88994eaddafc7fcec4ae9ce1 Mon Sep 17 00:00:00 2001
From: Philipp <admin@philipp.info>
Date: Sat, 17 Oct 2020 14:19:57 +0200
Subject: [PATCH] Fix wrong `$this->assert...()` with `self::assert...()

---
 tests/functional/DependencyCheckTest.php      |  42 +-
 tests/legacy/ApiTest.php                      | 600 +++++++++---------
 tests/src/App/ArgumentsTest.php               |  28 +-
 tests/src/App/ModeTest.php                    |  72 +--
 tests/src/App/ModuleTest.php                  |  14 +-
 tests/src/App/RouterTest.php                  |  48 +-
 .../AutomaticInstallationConsoleTest.php      | 124 ++--
 tests/src/Console/ConfigConsoleTest.php       |  16 +-
 tests/src/Console/LockConsoleTest.php         |  20 +-
 tests/src/Console/ServerBlockConsoleTest.php  |  24 +-
 tests/src/Content/PageInfoTest.php            |   4 +-
 tests/src/Content/SmiliesTest.php             |   2 +-
 tests/src/Content/Text/BBCode/VideoTest.php   |   2 +-
 tests/src/Content/Text/BBCodeTest.php         |   8 +-
 tests/src/Content/Text/HTMLTest.php           |   4 +-
 tests/src/Content/Text/MarkdownTest.php       |   4 +-
 tests/src/Core/Cache/CacheTest.php            |  52 +-
 tests/src/Core/Cache/MemoryCacheTest.php      |  38 +-
 tests/src/Core/Config/CacheTest.php           |  70 +-
 tests/src/Core/Config/ConfigTest.php          |  92 +--
 tests/src/Core/Config/JitConfigTest.php       |   2 +-
 tests/src/Core/Config/PreloadConfigTest.php   |   4 +-
 tests/src/Core/InstallerTest.php              |  66 +-
 tests/src/Core/L10nTest.php                   |   2 +-
 tests/src/Core/Lock/LockTest.php              | 140 ++--
 tests/src/Core/Lock/SemaphoreLockTest.php     |  20 +-
 tests/src/Core/PConfig/CacheTest.php          |  52 +-
 tests/src/Core/PConfig/JitPConfigTest.php     |   2 +-
 tests/src/Core/PConfig/PConfigTest.php        | 108 ++--
 tests/src/Core/PConfig/PreloadPConfigTest.php |   4 +-
 tests/src/Core/StorageManagerTest.php         |  50 +-
 tests/src/Core/SystemTest.php                 |  10 +-
 tests/src/Database/DBATest.php                |  12 +-
 tests/src/Database/DBStructureTest.php        |  26 +-
 tests/src/Model/FileTagTest.php               |   4 +-
 tests/src/Model/ProcessTest.php               |  12 +-
 .../src/Model/Storage/DatabaseStorageTest.php |   2 +-
 .../Model/Storage/FilesystemStorageTest.php   |  12 +-
 tests/src/Model/Storage/StorageTest.php       |  22 +-
 tests/src/Model/User/CookieTest.php           |  66 +-
 tests/src/Model/UserTest.php                  |   6 +-
 .../Api/Twitter/ContactEndpointTest.php       |  54 +-
 tests/src/Network/CurlResultTest.php          |  76 +--
 tests/src/Network/ProbeTest.php               |   4 +-
 tests/src/Protocol/ActivityTest.php           |   6 +-
 tests/src/Util/ACLFormaterTest.php            |  20 +-
 tests/src/Util/ArraysTest.php                 |  22 +-
 tests/src/Util/BasePathTest.php               |   2 +-
 tests/src/Util/BaseURLTest.php                |  28 +-
 .../src/Util/Config/ConfigFileLoaderTest.php  |  76 +--
 tests/src/Util/CryptoTest.php                 |  20 +-
 tests/src/Util/DateTimeFormatTest.php         |   2 +-
 tests/src/Util/EMailerTest.php                |  30 +-
 tests/src/Util/Emailer/MailBuilderTest.php    |  26 +-
 .../Util/Emailer/SystemMailBuilderTest.php    |   4 +-
 tests/src/Util/HTTPSignatureTest.php          |   2 +-
 tests/src/Util/JsonLDTest.php                 |  34 +-
 tests/src/Util/Logger/AbstractLoggerTest.php  |  24 +-
 tests/src/Util/Logger/StreamLoggerTest.php    |   4 +-
 tests/src/Util/Logger/WorkerLoggerTest.php    |   8 +-
 tests/src/Util/ProfilerTest.php               |  20 +-
 tests/src/Util/StringsTest.php                |  28 +-
 tests/src/Util/XmlTest.php                    |   8 +-
 63 files changed, 1192 insertions(+), 1192 deletions(-)

diff --git a/tests/functional/DependencyCheckTest.php b/tests/functional/DependencyCheckTest.php
index a99e25cda1..32c0164486 100644
--- a/tests/functional/DependencyCheckTest.php
+++ b/tests/functional/DependencyCheckTest.php
@@ -19,7 +19,7 @@
  *
  */
 
-namespace functional;
+namespace Friendica\Test\functional;
 
 use Dice\Dice;
 use Friendica\App;
@@ -63,8 +63,8 @@ class dependencyCheck extends TestCase
 		/** @var BasePath $basePath */
 		$basePath = $this->dice->create(BasePath::class, [$this->root->url()]);
 
-		$this->assertInstanceOf(BasePath::class, $basePath);
-		$this->assertEquals($this->root->url(), $basePath->getPath());
+		self::assertInstanceOf(BasePath::class, $basePath);
+		self::assertEquals($this->root->url(), $basePath->getPath());
 	}
 
 	/**
@@ -76,14 +76,14 @@ class dependencyCheck extends TestCase
 		/** @var ConfigFileLoader $configFileLoader */
 		$configFileLoader = $this->dice->create(ConfigFileLoader::class);
 
-		$this->assertInstanceOf(ConfigFileLoader::class, $configFileLoader);
+		self::assertInstanceOf(ConfigFileLoader::class, $configFileLoader);
 
 		$configCache = new Cache();
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertNotEmpty($configCache->getAll());
-		$this->assertArrayHasKey('database', $configCache->getAll());
-		$this->assertArrayHasKey('system', $configCache->getAll());
+		self::assertNotEmpty($configCache->getAll());
+		self::assertArrayHasKey('database', $configCache->getAll());
+		self::assertArrayHasKey('system', $configCache->getAll());
 	}
 
 	/**
@@ -94,7 +94,7 @@ class dependencyCheck extends TestCase
 		/** @var Profiler $profiler */
 		$profiler = $this->dice->create(Profiler::class);
 
-		$this->assertInstanceOf(Profiler::class, $profiler);
+		self::assertInstanceOf(Profiler::class, $profiler);
 
 		$configCache = new Cache([
 			'system' => [
@@ -109,8 +109,8 @@ class dependencyCheck extends TestCase
 		$this->dice = new Dice();
 		$profiler = $this->dice->create(Profiler::class, [$configCache]);
 
-		$this->assertInstanceOf(Profiler::class, $profiler);
-		$this->assertTrue($profiler->isRendertime());
+		self::assertInstanceOf(Profiler::class, $profiler);
+		self::assertTrue($profiler->isRendertime());
 	}
 
 	public function testDatabase()
@@ -118,8 +118,8 @@ class dependencyCheck extends TestCase
 		/** @var Database $database */
 		$database = $this->dice->create(Database::class);
 
-		$this->assertInstanceOf(Database::class, $database);
-		$this->assertTrue($database->connected());
+		self::assertInstanceOf(Database::class, $database);
+		self::assertTrue($database->connected());
 	}
 
 	public function testAppMode()
@@ -127,9 +127,9 @@ class dependencyCheck extends TestCase
 		/** @var App\Mode $mode */
 		$mode = $this->dice->create(App\Mode::class);
 
-		$this->assertInstanceOf(App\Mode::class, $mode);
+		self::assertInstanceOf(App\Mode::class, $mode);
 
-		$this->assertTrue($mode->isNormal());
+		self::assertTrue($mode->isNormal());
 	}
 
 	public function testConfiguration()
@@ -137,9 +137,9 @@ class dependencyCheck extends TestCase
 		/** @var IConfig $config */
 		$config = $this->dice->create(IConfig::class);
 
-		$this->assertInstanceOf(IConfig::class, $config);
+		self::assertInstanceOf(IConfig::class, $config);
 
-		$this->assertNotEmpty($config->get('database', 'username'));
+		self::assertNotEmpty($config->get('database', 'username'));
 	}
 
 	public function testLogger()
@@ -147,7 +147,7 @@ class dependencyCheck extends TestCase
 		/** @var LoggerInterface $logger */
 		$logger = $this->dice->create(LoggerInterface::class, ['test']);
 
-		$this->assertInstanceOf(LoggerInterface::class, $logger);
+		self::assertInstanceOf(LoggerInterface::class, $logger);
 	}
 
 	public function testDevLogger()
@@ -159,7 +159,7 @@ class dependencyCheck extends TestCase
 		/** @var LoggerInterface $logger */
 		$logger = $this->dice->create('$devLogger', ['dev']);
 
-		$this->assertInstanceOf(LoggerInterface::class, $logger);
+		self::assertInstanceOf(LoggerInterface::class, $logger);
 	}
 
 	public function testCache()
@@ -167,7 +167,7 @@ class dependencyCheck extends TestCase
 		/** @var ICache $cache */
 		$cache = $this->dice->create(ICache::class);
 
-		$this->assertInstanceOf(ICache::class, $cache);
+		self::assertInstanceOf(ICache::class, $cache);
 	}
 
 	public function testMemoryCache()
@@ -176,7 +176,7 @@ class dependencyCheck extends TestCase
 		$cache = $this->dice->create(IMemoryCache::class);
 
 		// We need to check "just" ICache, because the default Cache is DB-Cache, which isn't a memorycache
-		$this->assertInstanceOf(ICache::class, $cache);
+		self::assertInstanceOf(ICache::class, $cache);
 	}
 
 	public function testLock()
@@ -184,6 +184,6 @@ class dependencyCheck extends TestCase
 		/** @var ILock $cache */
 		$lock = $this->dice->create(ILock::class);
 
-		$this->assertInstanceOf(ILock::class, $lock);
+		self::assertInstanceOf(ILock::class, $lock);
 	}
 }
diff --git a/tests/legacy/ApiTest.php b/tests/legacy/ApiTest.php
index 1ff66efb6a..9f7aff7a00 100644
--- a/tests/legacy/ApiTest.php
+++ b/tests/legacy/ApiTest.php
@@ -123,14 +123,14 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertSelfUser(array $user)
 	{
-		$this->assertEquals($this->selfUser['id'], $user['uid']);
-		$this->assertEquals($this->selfUser['id'], $user['cid']);
-		$this->assertEquals(1, $user['self']);
-		$this->assertEquals('DFRN', $user['location']);
-		$this->assertEquals($this->selfUser['name'], $user['name']);
-		$this->assertEquals($this->selfUser['nick'], $user['screen_name']);
-		$this->assertEquals('dfrn', $user['network']);
-		$this->assertTrue($user['verified']);
+		self::assertEquals($this->selfUser['id'], $user['uid']);
+		self::assertEquals($this->selfUser['id'], $user['cid']);
+		self::assertEquals(1, $user['self']);
+		self::assertEquals('DFRN', $user['location']);
+		self::assertEquals($this->selfUser['name'], $user['name']);
+		self::assertEquals($this->selfUser['nick'], $user['screen_name']);
+		self::assertEquals('dfrn', $user['network']);
+		self::assertTrue($user['verified']);
 	}
 
 	/**
@@ -142,12 +142,12 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertOtherUser(array $user)
 	{
-		$this->assertEquals($this->otherUser['id'], $user['id']);
-		$this->assertEquals($this->otherUser['id'], $user['id_str']);
-		$this->assertEquals(0, $user['self']);
-		$this->assertEquals($this->otherUser['name'], $user['name']);
-		$this->assertEquals($this->otherUser['nick'], $user['screen_name']);
-		$this->assertFalse($user['verified']);
+		self::assertEquals($this->otherUser['id'], $user['id']);
+		self::assertEquals($this->otherUser['id'], $user['id_str']);
+		self::assertEquals(0, $user['self']);
+		self::assertEquals($this->otherUser['name'], $user['name']);
+		self::assertEquals($this->otherUser['nick'], $user['screen_name']);
+		self::assertFalse($user['verified']);
 	}
 
 	/**
@@ -159,8 +159,8 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertStatus(array $status)
 	{
-		$this->assertInternalType('string', $status['text']);
-		$this->assertInternalType('int', $status['id']);
+		self::assertInternalType('string', $status['text']);
+		self::assertInternalType('int', $status['id']);
 		// We could probably do more checks here.
 	}
 
@@ -173,10 +173,10 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertList(array $list)
 	{
-		$this->assertInternalType('string', $list['name']);
-		$this->assertInternalType('int', $list['id']);
-		$this->assertInternalType('string', $list['id_str']);
-		$this->assertContains($list['mode'], ['public', 'private']);
+		self::assertInternalType('string', $list['name']);
+		self::assertInternalType('int', $list['id']);
+		self::assertInternalType('string', $list['id_str']);
+		self::assertContains($list['mode'], ['public', 'private']);
 		// We could probably do more checks here.
 	}
 
@@ -190,8 +190,8 @@ class ApiTest extends FixtureTest
 	 */
 	private function assertXml($result, $root_element)
 	{
-		$this->assertStringStartsWith('<?xml version="1.0"?>', $result);
-		$this->assertContains('<' . $root_element, $result);
+		self::assertStringStartsWith('<?xml version="1.0"?>', $result);
+		self::assertContains('<' . $root_element, $result);
 		// We could probably do more checks here.
 	}
 
@@ -221,7 +221,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiUser()
 	{
-		$this->assertEquals($this->selfUser['id'], api_user());
+		self::assertEquals($this->selfUser['id'], api_user());
 	}
 
 	/**
@@ -232,7 +232,7 @@ class ApiTest extends FixtureTest
 	public function testApiUserWithUnallowedUser()
 	{
 		$_SESSION = ['allow_api' => false];
-		$this->assertEquals(false, api_user());
+		self::assertEquals(false, api_user());
 	}
 
 	/**
@@ -242,7 +242,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiSource()
 	{
-		$this->assertEquals('api', api_source());
+		self::assertEquals('api', api_source());
 	}
 
 	/**
@@ -253,7 +253,7 @@ class ApiTest extends FixtureTest
 	public function testApiSourceWithTwidere()
 	{
 		$_SERVER['HTTP_USER_AGENT'] = 'Twidere';
-		$this->assertEquals('Twidere', api_source());
+		self::assertEquals('Twidere', api_source());
 	}
 
 	/**
@@ -264,7 +264,7 @@ class ApiTest extends FixtureTest
 	public function testApiSourceWithGet()
 	{
 		$_GET['source'] = 'source_name';
-		$this->assertEquals('source_name', api_source());
+		self::assertEquals('source_name', api_source());
 	}
 
 	/**
@@ -274,7 +274,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiDate()
 	{
-		$this->assertEquals('Wed Oct 10 00:00:00 +0000 1990', api_date('1990-10-10'));
+		self::assertEquals('Wed Oct 10 00:00:00 +0000 1990', api_date('1990-10-10'));
 	}
 
 	/**
@@ -285,7 +285,7 @@ class ApiTest extends FixtureTest
 	public function testApiRegisterFunc()
 	{
 		global $API;
-		$this->assertNull(
+		self::assertNull(
 			api_register_func(
 				'api_path',
 				function () {
@@ -294,9 +294,9 @@ class ApiTest extends FixtureTest
 				'method'
 			)
 		);
-		$this->assertTrue($API['api_path']['auth']);
-		$this->assertEquals('method', $API['api_path']['method']);
-		$this->assertTrue(is_callable($API['api_path']['func']));
+		self::assertTrue($API['api_path']['auth']);
+		self::assertEquals('method', $API['api_path']['method']);
+		self::assertTrue(is_callable($API['api_path']['func']));
 	}
 
 	/**
@@ -377,7 +377,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiCheckMethod()
 	{
-		$this->assertFalse(api_check_method('method'));
+		self::assertFalse(api_check_method('method'));
 	}
 
 	/**
@@ -388,7 +388,7 @@ class ApiTest extends FixtureTest
 	public function testApiCheckMethodWithCorrectMethod()
 	{
 		$_SERVER['REQUEST_METHOD'] = 'method';
-		$this->assertTrue(api_check_method('method'));
+		self::assertTrue(api_check_method('method'));
 	}
 
 	/**
@@ -398,7 +398,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiCheckMethodWithWildcard()
 	{
-		$this->assertTrue(api_check_method('*'));
+		self::assertTrue(api_check_method('*'));
 	}
 
 	/**
@@ -422,7 +422,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'callback_name(["some_data"])',
 			api_call($this->app, $args)
 		);
@@ -459,7 +459,7 @@ class ApiTest extends FixtureTest
 			'network'        => ['some_function' => 200]
 		];
 
-		$this->assertEquals(
+		self::assertEquals(
 			'["some_data"]',
 			api_call($this->app, $args)
 		);
@@ -485,7 +485,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'{"status":{"error":"Internal Server Error","code":"500 Internal Server Error","request":"api_path"}}',
 			api_call($this->app, $args)
 		);
@@ -499,7 +499,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiCallWithUninplementedApi()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'{"status":{"error":"Not Implemented","code":"501 Not Implemented","request":""}}',
 			api_call($this->app)
 		);
@@ -525,7 +525,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'["some_data"]',
 			api_call($this->app, $args)
 		);
@@ -551,7 +551,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'some_data',
 			api_call($this->app, $args)
 		);
@@ -577,7 +577,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0" encoding="UTF-8"?>' . "\n" .
 			'some_data',
 			api_call($this->app, $args)
@@ -604,7 +604,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0" encoding="UTF-8"?>' . "\n" .
 			'some_data',
 			api_call($this->app, $args)
@@ -626,7 +626,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'{"status":{"error":"Method Not Allowed","code":"405 Method Not Allowed","request":"api_path"}}',
 			api_call($this->app, $args)
 		);
@@ -651,7 +651,7 @@ class ApiTest extends FixtureTest
 
 		$args = DI::args()->determine($_SERVER, $_GET);
 
-		$this->assertEquals(
+		self::assertEquals(
 			'{"status":{"error":"This API requires login","code":"401 Unauthorized","request":"api_path"}}',
 			api_call($this->app, $args)
 		);
@@ -665,7 +665,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiErrorWithJson()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'{"status":{"error":"error_message","code":"200 OK","request":""}}',
 			api_error('json', new HTTPException\OKException('error_message'), DI::args())
 		);
@@ -679,7 +679,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiErrorWithXml()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0"?>' . "\n" .
 			'<status xmlns="http://api.twitter.com" xmlns:statusnet="http://status.net/schema/api/1/" ' .
 			'xmlns:friendica="http://friendi.ca/schema/api/1/" ' .
@@ -700,7 +700,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiErrorWithRss()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0"?>' . "\n" .
 			'<status xmlns="http://api.twitter.com" xmlns:statusnet="http://status.net/schema/api/1/" ' .
 			'xmlns:friendica="http://friendi.ca/schema/api/1/" ' .
@@ -721,7 +721,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiErrorWithAtom()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0"?>' . "\n" .
 			'<status xmlns="http://api.twitter.com" xmlns:statusnet="http://status.net/schema/api/1/" ' .
 			'xmlns:friendica="http://friendi.ca/schema/api/1/" ' .
@@ -743,14 +743,14 @@ class ApiTest extends FixtureTest
 	{
 		$user_info = ['url' => 'user_url', 'lang' => 'en'];
 		$result    = api_rss_extra($this->app, [], $user_info);
-		$this->assertEquals($user_info, $result['$user']);
-		$this->assertEquals($user_info['url'], $result['$rss']['alternate']);
-		$this->assertArrayHasKey('self', $result['$rss']);
-		$this->assertArrayHasKey('base', $result['$rss']);
-		$this->assertArrayHasKey('updated', $result['$rss']);
-		$this->assertArrayHasKey('atom_updated', $result['$rss']);
-		$this->assertArrayHasKey('language', $result['$rss']);
-		$this->assertArrayHasKey('logo', $result['$rss']);
+		self::assertEquals($user_info, $result['$user']);
+		self::assertEquals($user_info['url'], $result['$rss']['alternate']);
+		self::assertArrayHasKey('self', $result['$rss']);
+		self::assertArrayHasKey('base', $result['$rss']);
+		self::assertArrayHasKey('updated', $result['$rss']);
+		self::assertArrayHasKey('atom_updated', $result['$rss']);
+		self::assertArrayHasKey('language', $result['$rss']);
+		self::assertArrayHasKey('logo', $result['$rss']);
 	}
 
 	/**
@@ -761,14 +761,14 @@ class ApiTest extends FixtureTest
 	public function testApiRssExtraWithoutUserInfo()
 	{
 		$result = api_rss_extra($this->app, [], null);
-		$this->assertInternalType('array', $result['$user']);
-		$this->assertArrayHasKey('alternate', $result['$rss']);
-		$this->assertArrayHasKey('self', $result['$rss']);
-		$this->assertArrayHasKey('base', $result['$rss']);
-		$this->assertArrayHasKey('updated', $result['$rss']);
-		$this->assertArrayHasKey('atom_updated', $result['$rss']);
-		$this->assertArrayHasKey('language', $result['$rss']);
-		$this->assertArrayHasKey('logo', $result['$rss']);
+		self::assertInternalType('array', $result['$user']);
+		self::assertArrayHasKey('alternate', $result['$rss']);
+		self::assertArrayHasKey('self', $result['$rss']);
+		self::assertArrayHasKey('base', $result['$rss']);
+		self::assertArrayHasKey('updated', $result['$rss']);
+		self::assertArrayHasKey('atom_updated', $result['$rss']);
+		self::assertArrayHasKey('language', $result['$rss']);
+		self::assertArrayHasKey('logo', $result['$rss']);
 	}
 
 	/**
@@ -778,7 +778,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiUniqueIdToNurl()
 	{
-		$this->assertFalse(api_unique_id_to_nurl($this->wrongUserId));
+		self::assertFalse(api_unique_id_to_nurl($this->wrongUserId));
 	}
 
 	/**
@@ -788,7 +788,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiUniqueIdToNurlWithCorrectId()
 	{
-		$this->assertEquals($this->otherUser['nurl'], api_unique_id_to_nurl($this->otherUser['id']));
+		self::assertEquals($this->otherUser['nurl'], api_unique_id_to_nurl($this->otherUser['id']));
 	}
 
 	/**
@@ -799,10 +799,10 @@ class ApiTest extends FixtureTest
 	public function testApiGetUser()
 	{
 		$user = api_get_user($this->app);
-		$this->assertSelfUser($user);
-		$this->assertEquals('708fa0', $user['profile_sidebar_fill_color']);
-		$this->assertEquals('6fdbe8', $user['profile_link_color']);
-		$this->assertEquals('ededed', $user['profile_background_color']);
+		self::assertSelfUser($user);
+		self::assertEquals('708fa0', $user['profile_sidebar_fill_color']);
+		self::assertEquals('6fdbe8', $user['profile_link_color']);
+		self::assertEquals('ededed', $user['profile_background_color']);
 	}
 
 	/**
@@ -815,10 +815,10 @@ class ApiTest extends FixtureTest
 		$pConfig = $this->dice->create(IPConfig::class);
 		$pConfig->set($this->selfUser['id'], 'frio', 'schema', 'red');
 		$user = api_get_user($this->app);
-		$this->assertSelfUser($user);
-		$this->assertEquals('708fa0', $user['profile_sidebar_fill_color']);
-		$this->assertEquals('6fdbe8', $user['profile_link_color']);
-		$this->assertEquals('ededed', $user['profile_background_color']);
+		self::assertSelfUser($user);
+		self::assertEquals('708fa0', $user['profile_sidebar_fill_color']);
+		self::assertEquals('6fdbe8', $user['profile_link_color']);
+		self::assertEquals('ededed', $user['profile_background_color']);
 	}
 
 	/**
@@ -831,10 +831,10 @@ class ApiTest extends FixtureTest
 		$pConfig = $this->dice->create(IPConfig::class);
 		$pConfig->set($this->selfUser['id'], 'frio', 'schema', '---');
 		$user = api_get_user($this->app);
-		$this->assertSelfUser($user);
-		$this->assertEquals('708fa0', $user['profile_sidebar_fill_color']);
-		$this->assertEquals('6fdbe8', $user['profile_link_color']);
-		$this->assertEquals('ededed', $user['profile_background_color']);
+		self::assertSelfUser($user);
+		self::assertEquals('708fa0', $user['profile_sidebar_fill_color']);
+		self::assertEquals('6fdbe8', $user['profile_link_color']);
+		self::assertEquals('ededed', $user['profile_background_color']);
 	}
 
 	/**
@@ -850,10 +850,10 @@ class ApiTest extends FixtureTest
 		$pConfig->set($this->selfUser['id'], 'frio', 'link_color', '#123456');
 		$pConfig->set($this->selfUser['id'], 'frio', 'background_color', '#123456');
 		$user = api_get_user($this->app);
-		$this->assertSelfUser($user);
-		$this->assertEquals('123456', $user['profile_sidebar_fill_color']);
-		$this->assertEquals('123456', $user['profile_link_color']);
-		$this->assertEquals('123456', $user['profile_background_color']);
+		self::assertSelfUser($user);
+		self::assertEquals('123456', $user['profile_sidebar_fill_color']);
+		self::assertEquals('123456', $user['profile_link_color']);
+		self::assertEquals('123456', $user['profile_background_color']);
 	}
 
 	/**
@@ -867,7 +867,7 @@ class ApiTest extends FixtureTest
 		$_SERVER['PHP_AUTH_USER'] = 'Test user';
 		$_SERVER['PHP_AUTH_PW']   = 'password';
 		$_SESSION['allow_api']    = false;
-		$this->assertFalse(api_get_user($this->app));
+		self::assertFalse(api_get_user($this->app));
 	}
 
 	/**
@@ -878,7 +878,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetUserWithGetId()
 	{
 		$_GET['user_id'] = $this->otherUser['id'];
-		$this->assertOtherUser(api_get_user($this->app));
+		self::assertOtherUser(api_get_user($this->app));
 	}
 
 	/**
@@ -890,7 +890,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetUserWithWrongGetId()
 	{
 		$_GET['user_id'] = $this->wrongUserId;
-		$this->assertOtherUser(api_get_user($this->app));
+		self::assertOtherUser(api_get_user($this->app));
 	}
 
 	/**
@@ -901,7 +901,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetUserWithGetName()
 	{
 		$_GET['screen_name'] = $this->selfUser['nick'];
-		$this->assertSelfUser(api_get_user($this->app));
+		self::assertSelfUser(api_get_user($this->app));
 	}
 
 	/**
@@ -912,7 +912,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetUserWithGetUrl()
 	{
 		$_GET['profileurl'] = $this->selfUser['nurl'];
-		$this->assertSelfUser(api_get_user($this->app));
+		self::assertSelfUser(api_get_user($this->app));
 	}
 
 	/**
@@ -925,7 +925,7 @@ class ApiTest extends FixtureTest
 		global $called_api;
 		$called_api         = ['api_path'];
 		$this->app->argv[1] = $this->otherUser['id'] . '.json';
-		$this->assertOtherUser(api_get_user($this->app));
+		self::assertOtherUser(api_get_user($this->app));
 	}
 
 	/**
@@ -937,7 +937,7 @@ class ApiTest extends FixtureTest
 	{
 		global $called_api;
 		$called_api = ['api', 'api_path'];
-		$this->assertSelfUser(api_get_user($this->app));
+		self::assertSelfUser(api_get_user($this->app));
 	}
 
 	/**
@@ -947,7 +947,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiGetUserWithCorrectUser()
 	{
-		$this->assertOtherUser(api_get_user($this->app, $this->otherUser['id']));
+		self::assertOtherUser(api_get_user($this->app, $this->otherUser['id']));
 	}
 
 	/**
@@ -958,7 +958,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiGetUserWithWrongUser()
 	{
-		$this->assertOtherUser(api_get_user($this->app, $this->wrongUserId));
+		self::assertOtherUser(api_get_user($this->app, $this->wrongUserId));
 	}
 
 	/**
@@ -968,7 +968,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiGetUserWithZeroUser()
 	{
-		$this->assertSelfUser(api_get_user($this->app, 0));
+		self::assertSelfUser(api_get_user($this->app, 0));
 	}
 
 	/**
@@ -979,7 +979,7 @@ class ApiTest extends FixtureTest
 	public function testApiItemGetUser()
 	{
 		$users = api_item_get_user($this->app, []);
-		$this->assertSelfUser($users[0]);
+		self::assertSelfUser($users[0]);
 	}
 
 	/**
@@ -990,8 +990,8 @@ class ApiTest extends FixtureTest
 	public function testApiItemGetUserWithDifferentParent()
 	{
 		$users = api_item_get_user($this->app, ['thr-parent' => 'item_parent', 'uri' => 'item_uri']);
-		$this->assertSelfUser($users[0]);
-		$this->assertEquals($users[0], $users[1]);
+		self::assertSelfUser($users[0]);
+		self::assertEquals($users[0], $users[1]);
 	}
 
 	/**
@@ -1002,7 +1002,7 @@ class ApiTest extends FixtureTest
 	public function testApiWalkRecursive()
 	{
 		$array = ['item1'];
-		$this->assertEquals(
+		self::assertEquals(
 			$array,
 			api_walk_recursive(
 				$array,
@@ -1022,7 +1022,7 @@ class ApiTest extends FixtureTest
 	public function testApiWalkRecursiveWithArray()
 	{
 		$array = [['item1'], ['item2']];
-		$this->assertEquals(
+		self::assertEquals(
 			$array,
 			api_walk_recursive(
 				$array,
@@ -1043,8 +1043,8 @@ class ApiTest extends FixtureTest
 	{
 		$item = true;
 		$key  = '';
-		$this->assertTrue(api_reformat_xml($item, $key));
-		$this->assertEquals('true', $item);
+		self::assertTrue(api_reformat_xml($item, $key));
+		self::assertEquals('true', $item);
 	}
 
 	/**
@@ -1056,8 +1056,8 @@ class ApiTest extends FixtureTest
 	{
 		$item = '';
 		$key  = 'statusnet_api';
-		$this->assertTrue(api_reformat_xml($item, $key));
-		$this->assertEquals('statusnet:api', $key);
+		self::assertTrue(api_reformat_xml($item, $key));
+		self::assertEquals('statusnet:api', $key);
 	}
 
 	/**
@@ -1069,8 +1069,8 @@ class ApiTest extends FixtureTest
 	{
 		$item = '';
 		$key  = 'friendica_api';
-		$this->assertTrue(api_reformat_xml($item, $key));
-		$this->assertEquals('friendica:api', $key);
+		self::assertTrue(api_reformat_xml($item, $key));
+		self::assertEquals('friendica:api', $key);
 	}
 
 	/**
@@ -1080,7 +1080,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiCreateXml()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0"?>' . "\n" .
 			'<root_element xmlns="http://api.twitter.com" xmlns:statusnet="http://status.net/schema/api/1/" ' .
 			'xmlns:friendica="http://friendi.ca/schema/api/1/" ' .
@@ -1098,7 +1098,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiCreateXmlWithoutNamespaces()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0"?>' . "\n" .
 			'<ok>' . "\n" .
 			'  <data>some_data</data>' . "\n" .
@@ -1115,7 +1115,7 @@ class ApiTest extends FixtureTest
 	public function testApiFormatData()
 	{
 		$data = ['some_data'];
-		$this->assertEquals($data, api_format_data('root_element', 'json', $data));
+		self::assertEquals($data, api_format_data('root_element', 'json', $data));
 	}
 
 	/**
@@ -1125,7 +1125,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiFormatDataWithXml()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'<?xml version="1.0"?>' . "\n" .
 			'<root_element xmlns="http://api.twitter.com" xmlns:statusnet="http://status.net/schema/api/1/" ' .
 			'xmlns:friendica="http://friendi.ca/schema/api/1/" ' .
@@ -1143,7 +1143,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiAccountVerifyCredentials()
 	{
-		$this->assertArrayHasKey('user', api_account_verify_credentials('json'));
+		self::assertArrayHasKey('user', api_account_verify_credentials('json'));
 	}
 
 	/**
@@ -1165,7 +1165,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testRequestdata()
 	{
-		$this->assertNull(requestdata('variable_name'));
+		self::assertNull(requestdata('variable_name'));
 	}
 
 	/**
@@ -1176,7 +1176,7 @@ class ApiTest extends FixtureTest
 	public function testRequestdataWithPost()
 	{
 		$_POST['variable_name'] = 'variable_value';
-		$this->assertEquals('variable_value', requestdata('variable_name'));
+		self::assertEquals('variable_value', requestdata('variable_name'));
 	}
 
 	/**
@@ -1187,7 +1187,7 @@ class ApiTest extends FixtureTest
 	public function testRequestdataWithGet()
 	{
 		$_GET['variable_name'] = 'variable_value';
-		$this->assertEquals('variable_value', requestdata('variable_name'));
+		self::assertEquals('variable_value', requestdata('variable_name'));
 	}
 
 	/**
@@ -1213,7 +1213,7 @@ class ApiTest extends FixtureTest
 		$_GET['status'] = '<b>Status content</b>';
 
 		$result = api_statuses_mediap('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1252,7 +1252,7 @@ class ApiTest extends FixtureTest
 		];
 
 		$result = api_statuses_update('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1265,7 +1265,7 @@ class ApiTest extends FixtureTest
 		$_GET['htmlstatus'] = '<b>Status content</b>';
 
 		$result = api_statuses_update('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1372,10 +1372,10 @@ class ApiTest extends FixtureTest
 		$app->argc = 2;
 
 		$result = api_media_upload();
-		$this->assertEquals('image/png', $result['media']['image']['image_type']);
-		$this->assertEquals(1, $result['media']['image']['w']);
-		$this->assertEquals(1, $result['media']['image']['h']);
-		$this->assertNotEmpty($result['media']['image']['friendica_preview_url']);
+		self::assertEquals('image/png', $result['media']['image']['image_type']);
+		self::assertEquals(1, $result['media']['image']['w']);
+		self::assertEquals(1, $result['media']['image']['h']);
+		self::assertNotEmpty($result['media']['image']['friendica_preview_url']);
 	}
 
 	/**
@@ -1384,7 +1384,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusShowWithJson()
 	{
 		$result = api_status_show('json', 1);
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1393,7 +1393,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusShowWithXml()
 	{
 		$result = api_status_show('xml', 1);
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -1403,7 +1403,7 @@ class ApiTest extends FixtureTest
 	{
 		$item = api_get_last_status($this->selfUser['id'], $this->selfUser['id']);
 
-		$this->assertNotNull($item);
+		self::assertNotNull($item);
 	}
 
 	/**
@@ -1415,12 +1415,12 @@ class ApiTest extends FixtureTest
 	{
 		$result = api_users_show('json');
 		// We can't use assertSelfUser() here because the user object is missing some properties.
-		$this->assertEquals($this->selfUser['id'], $result['user']['cid']);
-		$this->assertEquals('DFRN', $result['user']['location']);
-		$this->assertEquals($this->selfUser['name'], $result['user']['name']);
-		$this->assertEquals($this->selfUser['nick'], $result['user']['screen_name']);
-		$this->assertEquals('dfrn', $result['user']['network']);
-		$this->assertTrue($result['user']['verified']);
+		self::assertEquals($this->selfUser['id'], $result['user']['cid']);
+		self::assertEquals('DFRN', $result['user']['location']);
+		self::assertEquals($this->selfUser['name'], $result['user']['name']);
+		self::assertEquals($this->selfUser['nick'], $result['user']['screen_name']);
+		self::assertEquals('dfrn', $result['user']['network']);
+		self::assertTrue($result['user']['verified']);
 	}
 
 	/**
@@ -1431,7 +1431,7 @@ class ApiTest extends FixtureTest
 	public function testApiUsersShowWithXml()
 	{
 		$result = api_users_show('xml');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -1443,7 +1443,7 @@ class ApiTest extends FixtureTest
 	{
 		$_GET['q'] = 'othercontact';
 		$result    = api_users_search('json');
-		$this->assertOtherUser($result['users'][0]);
+		self::assertOtherUser($result['users'][0]);
 	}
 
 	/**
@@ -1455,7 +1455,7 @@ class ApiTest extends FixtureTest
 	{
 		$_GET['q'] = 'othercontact';
 		$result    = api_users_search('xml');
-		$this->assertXml($result, 'users');
+		self::assertXml($result, 'users');
 	}
 
 	/**
@@ -1489,7 +1489,7 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['user_id'] = $this->otherUser['id'];
 		$result              = api_users_lookup('json');
-		$this->assertOtherUser($result['users'][0]);
+		self::assertOtherUser($result['users'][0]);
 	}
 
 	/**
@@ -1503,8 +1503,8 @@ class ApiTest extends FixtureTest
 		$_REQUEST['max_id'] = 10;
 		$result             = api_search('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
-			$this->assertContains('reply', $status['text'], null, true);
+			self::assertStatus($status);
+			self::assertContains('reply', $status['text'], null, true);
 		}
 	}
 
@@ -1519,8 +1519,8 @@ class ApiTest extends FixtureTest
 		$_REQUEST['count'] = 20;
 		$result            = api_search('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
-			$this->assertContains('reply', $status['text'], null, true);
+			self::assertStatus($status);
+			self::assertContains('reply', $status['text'], null, true);
 		}
 	}
 
@@ -1535,8 +1535,8 @@ class ApiTest extends FixtureTest
 		$_REQUEST['rpp'] = 20;
 		$result          = api_search('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
-			$this->assertContains('reply', $status['text'], null, true);
+			self::assertStatus($status);
+			self::assertContains('reply', $status['text'], null, true);
 		}
 	}
 
@@ -1550,8 +1550,8 @@ class ApiTest extends FixtureTest
 		$_REQUEST['q'] = '%23friendica';
 		$result        = api_search('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
-			$this->assertContains('#friendica', $status['text'], null, true);
+			self::assertStatus($status);
+			self::assertContains('#friendica', $status['text'], null, true);
 		}
 	}
 
@@ -1567,7 +1567,7 @@ class ApiTest extends FixtureTest
 		$_REQUEST['q']               = 'friendica';
 		$result                      = api_search('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1606,9 +1606,9 @@ class ApiTest extends FixtureTest
 		$_REQUEST['exclude_replies'] = true;
 		$_REQUEST['conversation_id'] = 1;
 		$result                      = api_statuses_home_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1621,9 +1621,9 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['page'] = -2;
 		$result           = api_statuses_home_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1648,7 +1648,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesHomeTimelineWithRss()
 	{
 		$result = api_statuses_home_timeline('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -1661,9 +1661,9 @@ class ApiTest extends FixtureTest
 		$_REQUEST['max_id']          = 10;
 		$_REQUEST['conversation_id'] = 1;
 		$result                      = api_statuses_public_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1677,9 +1677,9 @@ class ApiTest extends FixtureTest
 		$_REQUEST['max_id']          = 10;
 		$_REQUEST['exclude_replies'] = true;
 		$result                      = api_statuses_public_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1692,9 +1692,9 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['page'] = -2;
 		$result           = api_statuses_public_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1719,7 +1719,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesPublicTimelineWithRss()
 	{
 		$result = api_statuses_public_timeline('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -1731,9 +1731,9 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['max_id'] = 10;
 		$result             = api_statuses_networkpublic_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1746,9 +1746,9 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['page'] = -2;
 		$result           = api_statuses_networkpublic_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1773,7 +1773,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesNetworkpublicTimelineWithRss()
 	{
 		$result = api_statuses_networkpublic_timeline('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -1796,7 +1796,7 @@ class ApiTest extends FixtureTest
 	{
 		$this->app->argv[3] = 1;
 		$result             = api_statuses_show('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1809,9 +1809,9 @@ class ApiTest extends FixtureTest
 		$this->app->argv[3]       = 1;
 		$_REQUEST['conversation'] = 1;
 		$result                   = api_statuses_show('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1850,9 +1850,9 @@ class ApiTest extends FixtureTest
 		$_REQUEST['max_id'] = 10;
 		$_REQUEST['page']   = -2;
 		$result             = api_conversation_show('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -1901,12 +1901,12 @@ class ApiTest extends FixtureTest
 	{
 		$this->app->argv[3] = 1;
 		$result             = api_statuses_repeat('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 
 		// Also test with a shared status
 		$this->app->argv[3] = 5;
 		$result             = api_statuses_repeat('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1941,7 +1941,7 @@ class ApiTest extends FixtureTest
 	{
 		$this->app->argv[3] = 1;
 		$result             = api_statuses_destroy('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -1954,7 +1954,7 @@ class ApiTest extends FixtureTest
 		$this->app->user    = ['nickname' => $this->selfUser['nick']];
 		$_REQUEST['max_id'] = 10;
 		$result             = api_statuses_mentions('json');
-		$this->assertEmpty($result['status']);
+		self::assertEmpty($result['status']);
 		// We should test with mentions in the database.
 	}
 
@@ -1967,7 +1967,7 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['page'] = -2;
 		$result           = api_statuses_mentions('json');
-		$this->assertEmpty($result['status']);
+		self::assertEmpty($result['status']);
 	}
 
 	/**
@@ -1991,7 +1991,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesMentionsWithRss()
 	{
 		$result = api_statuses_mentions('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -2005,9 +2005,9 @@ class ApiTest extends FixtureTest
 		$_REQUEST['exclude_replies'] = true;
 		$_REQUEST['conversation_id'] = 1;
 		$result                      = api_statuses_user_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -2020,9 +2020,9 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['page'] = -2;
 		$result           = api_statuses_user_timeline('json');
-		$this->assertNotEmpty($result['status']);
+		self::assertNotEmpty($result['status']);
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -2034,7 +2034,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesUserTimelineWithRss()
 	{
 		$result = api_statuses_user_timeline('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -2101,7 +2101,7 @@ class ApiTest extends FixtureTest
 		$this->app->argc = count($this->app->argv);
 		$_REQUEST['id']  = 3;
 		$result          = api_favorites_create_destroy('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -2115,7 +2115,7 @@ class ApiTest extends FixtureTest
 		$this->app->argc = count($this->app->argv);
 		$_REQUEST['id']  = 3;
 		$result          = api_favorites_create_destroy('rss');
-		$this->assertXml($result, 'status');
+		self::assertXml($result, 'status');
 	}
 
 	/**
@@ -2129,7 +2129,7 @@ class ApiTest extends FixtureTest
 		$this->app->argc = count($this->app->argv);
 		$_REQUEST['id']  = 3;
 		$result          = api_favorites_create_destroy('json');
-		$this->assertStatus($result['status']);
+		self::assertStatus($result['status']);
 	}
 
 	/**
@@ -2157,7 +2157,7 @@ class ApiTest extends FixtureTest
 		$_REQUEST['max_id'] = 10;
 		$result             = api_favorites('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -2169,7 +2169,7 @@ class ApiTest extends FixtureTest
 	public function testApiFavoritesWithRss()
 	{
 		$result = api_favorites('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -2197,12 +2197,12 @@ class ApiTest extends FixtureTest
 			['id' => 2, 'screen_name' => 'recipient_name'],
 			['id' => 3, 'screen_name' => 'sender_name']
 		);
-		$this->assertEquals('item_title' . "\n" . 'item_body', $result['text']);
-		$this->assertEquals(1, $result['id']);
-		$this->assertEquals(2, $result['recipient_id']);
-		$this->assertEquals(3, $result['sender_id']);
-		$this->assertEquals('recipient_name', $result['recipient_screen_name']);
-		$this->assertEquals('sender_name', $result['sender_screen_name']);
+		self::assertEquals('item_title' . "\n" . 'item_body', $result['text']);
+		self::assertEquals(1, $result['id']);
+		self::assertEquals(2, $result['recipient_id']);
+		self::assertEquals(3, $result['sender_id']);
+		self::assertEquals('recipient_name', $result['recipient_screen_name']);
+		self::assertEquals('sender_name', $result['sender_screen_name']);
 	}
 
 	/**
@@ -2218,8 +2218,8 @@ class ApiTest extends FixtureTest
 			['id' => 2, 'screen_name' => 'recipient_name'],
 			['id' => 3, 'screen_name' => 'sender_name']
 		);
-		$this->assertEquals('item_title', $result['title']);
-		$this->assertEquals('<strong>item_body</strong>', $result['text']);
+		self::assertEquals('item_title', $result['title']);
+		self::assertEquals('<strong>item_body</strong>', $result['text']);
 	}
 
 	/**
@@ -2235,8 +2235,8 @@ class ApiTest extends FixtureTest
 			['id' => 2, 'screen_name' => 'recipient_name'],
 			['id' => 3, 'screen_name' => 'sender_name']
 		);
-		$this->assertEquals('item_title', $result['title']);
-		$this->assertEquals('item_body', $result['text']);
+		self::assertEquals('item_title', $result['title']);
+		self::assertEquals('item_body', $result['text']);
 	}
 
 	/**
@@ -2252,8 +2252,8 @@ class ApiTest extends FixtureTest
 			['id' => 2, 'screen_name' => 'recipient_name'],
 			['id' => 3, 'screen_name' => 'sender_name']
 		);
-		$this->assertTrue(!isset($result['sender']));
-		$this->assertTrue(!isset($result['recipient']));
+		self::assertTrue(!isset($result['sender']));
+		self::assertTrue(!isset($result['recipient']));
 	}
 
 	/**
@@ -2294,8 +2294,8 @@ class ApiTest extends FixtureTest
 				'plink'   => 'item_plink'
 			]
 		);
-		$this->assertStringStartsWith('item_title', $result['text']);
-		$this->assertStringStartsWith('<h4>item_title</h4><br>perspiciatis impedit voluptatem', $result['html']);
+		self::assertStringStartsWith('item_title', $result['text']);
+		self::assertStringStartsWith('<h4>item_title</h4><br>perspiciatis impedit voluptatem', $result['html']);
 	}
 
 	/**
@@ -2313,8 +2313,8 @@ class ApiTest extends FixtureTest
 				'plink'   => 'item_plink'
 			]
 		);
-		$this->assertEquals('item_title', $result['text']);
-		$this->assertEquals('<h4>item_title</h4><br>item_plink', $result['html']);
+		self::assertEquals('item_title', $result['text']);
+		self::assertEquals('<h4>item_title</h4><br>item_plink', $result['html']);
 	}
 
 	/**
@@ -2330,8 +2330,8 @@ class ApiTest extends FixtureTest
 				'body'  => 'item_title item_body'
 			]
 		);
-		$this->assertEquals('item_title item_body', $result['text']);
-		$this->assertEquals('<h4>item_title</h4><br>item_title item_body', $result['html']);
+		self::assertEquals('item_title item_body', $result['text']);
+		self::assertEquals('<h4>item_title</h4><br>item_title item_body', $result['html']);
 	}
 
 	/**
@@ -2342,7 +2342,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetAttachments()
 	{
 		$body = 'body';
-		$this->assertEmpty(api_get_attachments($body));
+		self::assertEmpty(api_get_attachments($body));
 	}
 
 	/**
@@ -2353,7 +2353,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetAttachmentsWithImage()
 	{
 		$body = '[img]http://via.placeholder.com/1x1.png[/img]';
-		$this->assertInternalType('array', api_get_attachments($body));
+		self::assertInternalType('array', api_get_attachments($body));
 	}
 
 	/**
@@ -2365,7 +2365,7 @@ class ApiTest extends FixtureTest
 	{
 		$_SERVER['HTTP_USER_AGENT'] = 'AndStatus';
 		$body                       = '[img]http://via.placeholder.com/1x1.png[/img]';
-		$this->assertInternalType('array', api_get_attachments($body));
+		self::assertInternalType('array', api_get_attachments($body));
 	}
 
 	/**
@@ -2376,7 +2376,7 @@ class ApiTest extends FixtureTest
 	public function testApiGetEntitities()
 	{
 		$text = 'text';
-		$this->assertInternalType('array', api_get_entitities($text, 'bbcode'));
+		self::assertInternalType('array', api_get_entitities($text, 'bbcode'));
 	}
 
 	/**
@@ -2389,10 +2389,10 @@ class ApiTest extends FixtureTest
 		$_REQUEST['include_entities'] = 'true';
 		$text                         = 'text';
 		$result                       = api_get_entitities($text, 'bbcode');
-		$this->assertInternalType('array', $result['hashtags']);
-		$this->assertInternalType('array', $result['symbols']);
-		$this->assertInternalType('array', $result['urls']);
-		$this->assertInternalType('array', $result['user_mentions']);
+		self::assertInternalType('array', $result['hashtags']);
+		self::assertInternalType('array', $result['symbols']);
+		self::assertInternalType('array', $result['urls']);
+		self::assertInternalType('array', $result['user_mentions']);
 	}
 
 	/**
@@ -2402,7 +2402,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiFormatItemsEmbededImages()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			'text ' . DI::baseUrl() . '/display/item_guid',
 			api_format_items_embeded_images(['guid' => 'item_guid'], 'text data:image/foo')
 		);
@@ -2415,7 +2415,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiContactlinkToArray()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			[
 				'name' => 'text',
 				'url'  => '',
@@ -2431,7 +2431,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiContactlinkToArrayWithUrl()
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			[
 				'name' => ['link_text'],
 				'url'  => ['url'],
@@ -2449,11 +2449,11 @@ class ApiTest extends FixtureTest
 	{
 		$item   = ['uid' => 0, 'uri' => ''];
 		$result = api_format_items_activities($item);
-		$this->assertArrayHasKey('like', $result);
-		$this->assertArrayHasKey('dislike', $result);
-		$this->assertArrayHasKey('attendyes', $result);
-		$this->assertArrayHasKey('attendno', $result);
-		$this->assertArrayHasKey('attendmaybe', $result);
+		self::assertArrayHasKey('like', $result);
+		self::assertArrayHasKey('dislike', $result);
+		self::assertArrayHasKey('attendyes', $result);
+		self::assertArrayHasKey('attendno', $result);
+		self::assertArrayHasKey('attendmaybe', $result);
 	}
 
 	/**
@@ -2465,11 +2465,11 @@ class ApiTest extends FixtureTest
 	{
 		$item   = ['uid' => 0, 'uri' => ''];
 		$result = api_format_items_activities($item, 'xml');
-		$this->assertArrayHasKey('friendica:like', $result);
-		$this->assertArrayHasKey('friendica:dislike', $result);
-		$this->assertArrayHasKey('friendica:attendyes', $result);
-		$this->assertArrayHasKey('friendica:attendno', $result);
-		$this->assertArrayHasKey('friendica:attendmaybe', $result);
+		self::assertArrayHasKey('friendica:like', $result);
+		self::assertArrayHasKey('friendica:dislike', $result);
+		self::assertArrayHasKey('friendica:attendyes', $result);
+		self::assertArrayHasKey('friendica:attendno', $result);
+		self::assertArrayHasKey('friendica:attendmaybe', $result);
 	}
 
 	/**
@@ -2494,7 +2494,7 @@ class ApiTest extends FixtureTest
 		];
 		$result = api_format_items($items, ['id' => 0], true);
 		foreach ($result as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -2518,7 +2518,7 @@ class ApiTest extends FixtureTest
 		];
 		$result = api_format_items($items, ['id' => 0], true, 'xml');
 		foreach ($result as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -2530,9 +2530,9 @@ class ApiTest extends FixtureTest
 	public function testApiAccountRateLimitStatus()
 	{
 		$result = api_account_rate_limit_status('json');
-		$this->assertEquals(150, $result['hash']['remaining_hits']);
-		$this->assertEquals(150, $result['hash']['hourly_limit']);
-		$this->assertInternalType('int', $result['hash']['reset_time_in_seconds']);
+		self::assertEquals(150, $result['hash']['remaining_hits']);
+		self::assertEquals(150, $result['hash']['hourly_limit']);
+		self::assertInternalType('int', $result['hash']['reset_time_in_seconds']);
 	}
 
 	/**
@@ -2543,7 +2543,7 @@ class ApiTest extends FixtureTest
 	public function testApiAccountRateLimitStatusWithXml()
 	{
 		$result = api_account_rate_limit_status('xml');
-		$this->assertXml($result, 'hash');
+		self::assertXml($result, 'hash');
 	}
 
 	/**
@@ -2554,7 +2554,7 @@ class ApiTest extends FixtureTest
 	public function testApiHelpTest()
 	{
 		$result = api_help_test('json');
-		$this->assertEquals(['ok' => 'ok'], $result);
+		self::assertEquals(['ok' => 'ok'], $result);
 	}
 
 	/**
@@ -2565,7 +2565,7 @@ class ApiTest extends FixtureTest
 	public function testApiHelpTestWithXml()
 	{
 		$result = api_help_test('xml');
-		$this->assertXml($result, 'ok');
+		self::assertXml($result, 'ok');
 	}
 
 	/**
@@ -2576,7 +2576,7 @@ class ApiTest extends FixtureTest
 	public function testApiListsList()
 	{
 		$result = api_lists_list('json');
-		$this->assertEquals(['lists_list' => []], $result);
+		self::assertEquals(['lists_list' => []], $result);
 	}
 
 	/**
@@ -2588,7 +2588,7 @@ class ApiTest extends FixtureTest
 	{
 		$result = api_lists_ownerships('json');
 		foreach ($result['lists']['lists'] as $list) {
-			$this->assertList($list);
+			self::assertList($list);
 		}
 	}
 
@@ -2627,7 +2627,7 @@ class ApiTest extends FixtureTest
 		$_REQUEST['max_id']  = 10;
 		$result              = api_lists_statuses('json');
 		foreach ($result['status'] as $status) {
-			$this->assertStatus($status);
+			self::assertStatus($status);
 		}
 	}
 
@@ -2640,7 +2640,7 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['list_id'] = 1;
 		$result              = api_lists_statuses('rss');
-		$this->assertXml($result, 'statuses');
+		self::assertXml($result, 'statuses');
 	}
 
 	/**
@@ -2665,7 +2665,7 @@ class ApiTest extends FixtureTest
 	{
 		$_GET['page'] = -1;
 		$result       = api_statuses_f('friends');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2676,7 +2676,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFWithFollowers()
 	{
 		$result = api_statuses_f('followers');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2687,7 +2687,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFWithBlocks()
 	{
 		$result = api_statuses_f('blocks');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2698,7 +2698,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFWithIncoming()
 	{
 		$result = api_statuses_f('incoming');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2709,7 +2709,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFWithUndefinedCursor()
 	{
 		$_GET['cursor'] = 'undefined';
-		$this->assertFalse(api_statuses_f('friends'));
+		self::assertFalse(api_statuses_f('friends'));
 	}
 
 	/**
@@ -2720,7 +2720,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFriends()
 	{
 		$result = api_statuses_friends('json');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2731,7 +2731,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFriendsWithUndefinedCursor()
 	{
 		$_GET['cursor'] = 'undefined';
-		$this->assertFalse(api_statuses_friends('json'));
+		self::assertFalse(api_statuses_friends('json'));
 	}
 
 	/**
@@ -2742,7 +2742,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFollowers()
 	{
 		$result = api_statuses_followers('json');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2753,7 +2753,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusesFollowersWithUndefinedCursor()
 	{
 		$_GET['cursor'] = 'undefined';
-		$this->assertFalse(api_statuses_followers('json'));
+		self::assertFalse(api_statuses_followers('json'));
 	}
 
 	/**
@@ -2764,7 +2764,7 @@ class ApiTest extends FixtureTest
 	public function testApiBlocksList()
 	{
 		$result = api_blocks_list('json');
-		$this->assertArrayHasKey('user', $result);
+		self::assertArrayHasKey('user', $result);
 	}
 
 	/**
@@ -2775,7 +2775,7 @@ class ApiTest extends FixtureTest
 	public function testApiBlocksListWithUndefinedCursor()
 	{
 		$_GET['cursor'] = 'undefined';
-		$this->assertFalse(api_blocks_list('json'));
+		self::assertFalse(api_blocks_list('json'));
 	}
 
 	/**
@@ -2786,7 +2786,7 @@ class ApiTest extends FixtureTest
 	public function testApiFriendshipsIncoming()
 	{
 		$result = api_friendships_incoming('json');
-		$this->assertArrayHasKey('id', $result);
+		self::assertArrayHasKey('id', $result);
 	}
 
 	/**
@@ -2797,7 +2797,7 @@ class ApiTest extends FixtureTest
 	public function testApiFriendshipsIncomingWithUndefinedCursor()
 	{
 		$_GET['cursor'] = 'undefined';
-		$this->assertFalse(api_friendships_incoming('json'));
+		self::assertFalse(api_friendships_incoming('json'));
 	}
 
 	/**
@@ -2808,16 +2808,16 @@ class ApiTest extends FixtureTest
 	public function testApiStatusnetConfig()
 	{
 		$result = api_statusnet_config('json');
-		$this->assertEquals('localhost', $result['config']['site']['server']);
-		$this->assertEquals('default', $result['config']['site']['theme']);
-		$this->assertEquals(DI::baseUrl() . '/images/friendica-64.png', $result['config']['site']['logo']);
-		$this->assertTrue($result['config']['site']['fancy']);
-		$this->assertEquals('en', $result['config']['site']['language']);
-		$this->assertEquals('UTC', $result['config']['site']['timezone']);
-		$this->assertEquals(200000, $result['config']['site']['textlimit']);
-		$this->assertEquals('false', $result['config']['site']['private']);
-		$this->assertEquals('false', $result['config']['site']['ssl']);
-		$this->assertEquals(30, $result['config']['site']['shorturllength']);
+		self::assertEquals('localhost', $result['config']['site']['server']);
+		self::assertEquals('default', $result['config']['site']['theme']);
+		self::assertEquals(DI::baseUrl() . '/images/friendica-64.png', $result['config']['site']['logo']);
+		self::assertTrue($result['config']['site']['fancy']);
+		self::assertEquals('en', $result['config']['site']['language']);
+		self::assertEquals('UTC', $result['config']['site']['timezone']);
+		self::assertEquals(200000, $result['config']['site']['textlimit']);
+		self::assertEquals('false', $result['config']['site']['private']);
+		self::assertEquals('false', $result['config']['site']['ssl']);
+		self::assertEquals(30, $result['config']['site']['shorturllength']);
 	}
 
 	/**
@@ -2828,7 +2828,7 @@ class ApiTest extends FixtureTest
 	public function testApiStatusnetVersion()
 	{
 		$result = api_statusnet_version('json');
-		$this->assertEquals('0.9.7', $result['version']);
+		self::assertEquals('0.9.7', $result['version']);
 	}
 
 	/**
@@ -2839,7 +2839,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesNew()
 	{
 		$result = api_direct_messages_new('json');
-		$this->assertNull($result);
+		self::assertNull($result);
 	}
 
 	/**
@@ -2864,7 +2864,7 @@ class ApiTest extends FixtureTest
 		$_POST['text']    = 'message_text';
 		$_POST['user_id'] = $this->otherUser['id'];
 		$result           = api_direct_messages_new('json');
-		$this->assertEquals(['direct_message' => ['error' => -1]], $result);
+		self::assertEquals(['direct_message' => ['error' => -1]], $result);
 	}
 
 	/**
@@ -2878,9 +2878,9 @@ class ApiTest extends FixtureTest
 		$_POST['text']        = 'message_text';
 		$_POST['screen_name'] = $this->friendUser['nick'];
 		$result               = api_direct_messages_new('json');
-		$this->assertContains('message_text', $result['direct_message']['text']);
-		$this->assertEquals('selfcontact', $result['direct_message']['sender_screen_name']);
-		$this->assertEquals(1, $result['direct_message']['friendica_seen']);
+		self::assertContains('message_text', $result['direct_message']['text']);
+		self::assertEquals('selfcontact', $result['direct_message']['sender_screen_name']);
+		self::assertEquals(1, $result['direct_message']['friendica_seen']);
 	}
 
 	/**
@@ -2895,10 +2895,10 @@ class ApiTest extends FixtureTest
 		$_POST['screen_name'] = $this->friendUser['nick'];
 		$_REQUEST['title']    = 'message_title';
 		$result               = api_direct_messages_new('json');
-		$this->assertContains('message_text', $result['direct_message']['text']);
-		$this->assertContains('message_title', $result['direct_message']['text']);
-		$this->assertEquals('selfcontact', $result['direct_message']['sender_screen_name']);
-		$this->assertEquals(1, $result['direct_message']['friendica_seen']);
+		self::assertContains('message_text', $result['direct_message']['text']);
+		self::assertContains('message_title', $result['direct_message']['text']);
+		self::assertEquals('selfcontact', $result['direct_message']['sender_screen_name']);
+		self::assertEquals(1, $result['direct_message']['friendica_seen']);
 	}
 
 	/**
@@ -2912,7 +2912,7 @@ class ApiTest extends FixtureTest
 		$_POST['text']        = 'message_text';
 		$_POST['screen_name'] = $this->friendUser['nick'];
 		$result               = api_direct_messages_new('rss');
-		$this->assertXml($result, 'direct-messages');
+		self::assertXml($result, 'direct-messages');
 	}
 
 	/**
@@ -2935,7 +2935,7 @@ class ApiTest extends FixtureTest
 	{
 		$_GET['friendica_verbose'] = 'true';
 		$result                    = api_direct_messages_destroy('json');
-		$this->assertEquals(
+		self::assertEquals(
 			[
 				'$result' => [
 					'result'  => 'error',
@@ -2981,7 +2981,7 @@ class ApiTest extends FixtureTest
 		$_REQUEST['friendica_parenturi'] = 'parent_uri';
 		$_GET['friendica_verbose']       = 'true';
 		$result                          = api_direct_messages_destroy('json');
-		$this->assertEquals(
+		self::assertEquals(
 			[
 				'$result' => [
 					'result'  => 'error',
@@ -3012,7 +3012,7 @@ class ApiTest extends FixtureTest
 		$_REQUEST['page']   = -1;
 		$_REQUEST['max_id'] = 10;
 		$result             = api_direct_messages_box('json', 'sentbox', 'false');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3023,7 +3023,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesBoxWithConversation()
 	{
 		$result = api_direct_messages_box('json', 'conversation', 'false');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3034,7 +3034,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesBoxWithAll()
 	{
 		$result = api_direct_messages_box('json', 'all', 'false');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3045,7 +3045,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesBoxWithInbox()
 	{
 		$result = api_direct_messages_box('json', 'inbox', 'false');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3056,7 +3056,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesBoxWithVerbose()
 	{
 		$result = api_direct_messages_box('json', 'sentbox', 'true');
-		$this->assertEquals(
+		self::assertEquals(
 			[
 				'$result' => [
 					'result'  => 'error',
@@ -3075,7 +3075,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesBoxWithRss()
 	{
 		$result = api_direct_messages_box('rss', 'sentbox', 'false');
-		$this->assertXml($result, 'direct-messages');
+		self::assertXml($result, 'direct-messages');
 	}
 
 	/**
@@ -3099,7 +3099,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesSentbox()
 	{
 		$result = api_direct_messages_sentbox('json');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3110,7 +3110,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesInbox()
 	{
 		$result = api_direct_messages_inbox('json');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3121,7 +3121,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesAll()
 	{
 		$result = api_direct_messages_all('json');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3132,7 +3132,7 @@ class ApiTest extends FixtureTest
 	public function testApiDirectMessagesConversation()
 	{
 		$result = api_direct_messages_conversation('json');
-		$this->assertArrayHasKey('direct_message', $result);
+		self::assertArrayHasKey('direct_message', $result);
 	}
 
 	/**
@@ -3254,7 +3254,7 @@ class ApiTest extends FixtureTest
 	public function testApiFrPhotosList()
 	{
 		$result = api_fr_photos_list('json');
-		$this->assertArrayHasKey('photo', $result);
+		self::assertArrayHasKey('photo', $result);
 	}
 
 	/**
@@ -3460,12 +3460,12 @@ class ApiTest extends FixtureTest
 		$_POST['description'] = 'new_description';
 		$result               = api_account_update_profile('json');
 		// We can't use assertSelfUser() here because the user object is missing some properties.
-		$this->assertEquals($this->selfUser['id'], $result['user']['cid']);
-		$this->assertEquals('DFRN', $result['user']['location']);
-		$this->assertEquals($this->selfUser['nick'], $result['user']['screen_name']);
-		$this->assertEquals('dfrn', $result['user']['network']);
-		$this->assertEquals('new_name', $result['user']['name']);
-		$this->assertEquals('new_description', $result['user']['description']);
+		self::assertEquals($this->selfUser['id'], $result['user']['cid']);
+		self::assertEquals('DFRN', $result['user']['location']);
+		self::assertEquals($this->selfUser['nick'], $result['user']['screen_name']);
+		self::assertEquals('dfrn', $result['user']['network']);
+		self::assertEquals('new_name', $result['user']['name']);
+		self::assertEquals('new_description', $result['user']['description']);
 	}
 
 	/**
@@ -3477,7 +3477,7 @@ class ApiTest extends FixtureTest
 	{
 		$result = check_acl_input('<aclstring>');
 		// Where does this result come from?
-		$this->assertEquals(1, $result);
+		self::assertEquals(1, $result);
 	}
 
 	/**
@@ -3488,7 +3488,7 @@ class ApiTest extends FixtureTest
 	public function testCheckAclInputWithEmptyAclString()
 	{
 		$result = check_acl_input(' ');
-		$this->assertFalse($result);
+		self::assertFalse($result);
 	}
 
 	/**
@@ -3567,7 +3567,7 @@ class ApiTest extends FixtureTest
 	{
 		$item   = ['body' => '', 'author-id' => 1, 'owner-id' => 1];
 		$result = api_share_as_retweet($item);
-		$this->assertFalse($result);
+		self::assertFalse($result);
 	}
 
 	/**
@@ -3588,11 +3588,11 @@ class ApiTest extends FixtureTest
 	public function testApiInReplyTo()
 	{
 		$result = api_in_reply_to(['id' => 0, 'parent' => 0, 'uri' => '', 'thr-parent' => '']);
-		$this->assertArrayHasKey('status_id', $result);
-		$this->assertArrayHasKey('user_id', $result);
-		$this->assertArrayHasKey('status_id_str', $result);
-		$this->assertArrayHasKey('user_id_str', $result);
-		$this->assertArrayHasKey('screen_name', $result);
+		self::assertArrayHasKey('status_id', $result);
+		self::assertArrayHasKey('user_id', $result);
+		self::assertArrayHasKey('status_id_str', $result);
+		self::assertArrayHasKey('user_id_str', $result);
+		self::assertArrayHasKey('screen_name', $result);
 	}
 
 	/**
@@ -3614,7 +3614,7 @@ class ApiTest extends FixtureTest
 	{
 		$_REQUEST['include_entities'] = 'true';
 		$result                       = api_clean_plain_items('some_text [url="some_url"]some_text[/url]');
-		$this->assertEquals('some_text [url="some_url"]"some_url"[/url]', $result);
+		self::assertEquals('some_text [url="some_url"]"some_url"[/url]', $result);
 	}
 
 	/**
@@ -3626,7 +3626,7 @@ class ApiTest extends FixtureTest
 	{
 		$contacts = [];
 		$result   = api_best_nickname($contacts);
-		$this->assertNull($result);
+		self::assertNull($result);
 	}
 
 	/**
@@ -3763,7 +3763,7 @@ class ApiTest extends FixtureTest
 		$this->app->argc = count($this->app->argv);
 		$_SESSION['uid'] = 41;
 		$result          = api_friendica_notification('json');
-		$this->assertEquals(['note' => false], $result);
+		self::assertEquals(['note' => false], $result);
 	}
 
 	/**
@@ -3783,7 +3783,7 @@ class ApiTest extends FixtureTest
   <note id="1" hash="" type="8" name="Reply to" url="http://localhost/display/1" photo="http://localhost/" date="2020-01-01 12:12:02" msg="A test reply from an item" uid="42" uri-id="" link="http://localhost/notification/1" iid="4" parent="0" parent-uri-id="" seen="0" verb="" otype="item" name_cache="Reply to" msg_cache="A test reply from an item" timestamp="1577880722" date_rel="{$dateRel}" msg_html="A test reply from an item" msg_plain="A test reply from an item"/>
 </notes>
 XML;
-		$this->assertXmlStringEqualsXmlString($assertXml, $result);
+		self::assertXmlStringEqualsXmlString($assertXml, $result);
 	}
 
 	/**
@@ -3796,7 +3796,7 @@ XML;
 		$this->app->argv = ['api', 'friendica', 'notification'];
 		$this->app->argc = count($this->app->argv);
 		$result          = json_encode(api_friendica_notification('json'));
-		$this->assertJson($result);
+		self::assertJson($result);
 	}
 
 	/**
@@ -3837,9 +3837,9 @@ XML;
 	public function testApiSavedSearchesList()
 	{
 		$result = api_saved_searches_list('json');
-		$this->assertEquals(1, $result['terms'][0]['id']);
-		$this->assertEquals(1, $result['terms'][0]['id_str']);
-		$this->assertEquals('Saved search', $result['terms'][0]['name']);
-		$this->assertEquals('Saved search', $result['terms'][0]['query']);
+		self::assertEquals(1, $result['terms'][0]['id']);
+		self::assertEquals(1, $result['terms'][0]['id_str']);
+		self::assertEquals('Saved search', $result['terms'][0]['name']);
+		self::assertEquals('Saved search', $result['terms'][0]['query']);
 	}
 }
diff --git a/tests/src/App/ArgumentsTest.php b/tests/src/App/ArgumentsTest.php
index 9a1b5bdad8..0fde3a7e62 100644
--- a/tests/src/App/ArgumentsTest.php
+++ b/tests/src/App/ArgumentsTest.php
@@ -28,11 +28,11 @@ class ArgumentsTest extends TestCase
 {
 	private function assertArguments(array $assert, App\Arguments $arguments)
 	{
-		$this->assertEquals($assert['queryString'], $arguments->getQueryString());
-		$this->assertEquals($assert['command'], $arguments->getCommand());
-		$this->assertEquals($assert['argv'], $arguments->getArgv());
-		$this->assertEquals($assert['argc'], $arguments->getArgc());
-		$this->assertCount($assert['argc'], $arguments->getArgv());
+		self::assertEquals($assert['queryString'], $arguments->getQueryString());
+		self::assertEquals($assert['command'], $arguments->getCommand());
+		self::assertEquals($assert['argv'], $arguments->getArgv());
+		self::assertEquals($assert['argc'], $arguments->getArgc());
+		self::assertCount($assert['argc'], $arguments->getArgv());
 	}
 
 	/**
@@ -42,7 +42,7 @@ class ArgumentsTest extends TestCase
 	{
 		$arguments = new App\Arguments();
 
-		$this->assertArguments([
+		self::assertArguments([
 			'queryString' => '',
 			'command'     => '',
 			'argv'        => [],
@@ -177,7 +177,7 @@ class ArgumentsTest extends TestCase
 		$arguments = (new App\Arguments())
 			->determine($server, $get);
 
-		$this->assertArguments($assert, $arguments);
+		self::assertArguments($assert, $arguments);
 	}
 
 	/**
@@ -191,13 +191,13 @@ class ArgumentsTest extends TestCase
 			->determine($server, $get);
 
 		for ($i = 0; $i < $arguments->getArgc(); $i++) {
-			$this->assertTrue($arguments->has($i));
-			$this->assertEquals($assert['argv'][$i], $arguments->get($i));
+			self::assertTrue($arguments->has($i));
+			self::assertEquals($assert['argv'][$i], $arguments->get($i));
 		}
 
-		$this->assertFalse($arguments->has($arguments->getArgc()));
-		$this->assertEmpty($arguments->get($arguments->getArgc()));
-		$this->assertEquals('default', $arguments->get($arguments->getArgc(), 'default'));
+		self::assertFalse($arguments->has($arguments->getArgc()));
+		self::assertEmpty($arguments->get($arguments->getArgc()));
+		self::assertEquals('default', $arguments->get($arguments->getArgc(), 'default'));
 	}
 
 	public function dataStripped()
@@ -242,7 +242,7 @@ class ArgumentsTest extends TestCase
 		$arguments = (new App\Arguments())
 			->determine(['QUERY_STRING' => 'pagename=' . $command . $input,], ['pagename' => $command]);
 
-		$this->assertEquals($command . $assert, $arguments->getQueryString());
+		self::assertEquals($command . $assert, $arguments->getQueryString());
 	}
 
 	/**
@@ -254,6 +254,6 @@ class ArgumentsTest extends TestCase
 
 		$argNew = $argument->determine([], []);
 
-		$this->assertNotSame($argument, $argNew);
+		self::assertNotSame($argument, $argNew);
 	}
 }
diff --git a/tests/src/App/ModeTest.php b/tests/src/App/ModeTest.php
index 6ea13f1fb4..9179bfddce 100644
--- a/tests/src/App/ModeTest.php
+++ b/tests/src/App/ModeTest.php
@@ -66,26 +66,26 @@ class ModeTest extends MockedTest
 	public function testItEmpty()
 	{
 		$mode = new Mode();
-		$this->assertTrue($mode->isInstall());
-		$this->assertFalse($mode->isNormal());
+		self::assertTrue($mode->isInstall());
+		self::assertFalse($mode->isNormal());
 	}
 
 	public function testWithoutConfig()
 	{
 		$this->basePathMock->shouldReceive('getPath')->andReturn($this->root->url())->once();
 
-		$this->assertTrue($this->root->hasChild('config/local.config.php'));
+		self::assertTrue($this->root->hasChild('config/local.config.php'));
 
 		$this->delConfigFile('local.config.php');
 
-		$this->assertFalse($this->root->hasChild('config/local.config.php'));
+		self::assertFalse($this->root->hasChild('config/local.config.php'));
 
 		$mode = (new Mode())->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertTrue($mode->isInstall());
-		$this->assertFalse($mode->isNormal());
+		self::assertTrue($mode->isInstall());
+		self::assertFalse($mode->isNormal());
 
-		$this->assertFalse($mode->has(Mode::LOCALCONFIGPRESENT));
+		self::assertFalse($mode->has(Mode::LOCALCONFIGPRESENT));
 	}
 
 	public function testWithoutDatabase()
@@ -96,11 +96,11 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertFalse($mode->isNormal());
-		$this->assertTrue($mode->isInstall());
+		self::assertFalse($mode->isNormal());
+		self::assertTrue($mode->isInstall());
 
-		$this->assertTrue($mode->has(Mode::LOCALCONFIGPRESENT));
-		$this->assertFalse($mode->has(Mode::DBAVAILABLE));
+		self::assertTrue($mode->has(Mode::LOCALCONFIGPRESENT));
+		self::assertFalse($mode->has(Mode::DBAVAILABLE));
 	}
 
 	public function testWithoutDatabaseSetup()
@@ -113,10 +113,10 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertFalse($mode->isNormal());
-		$this->assertTrue($mode->isInstall());
+		self::assertFalse($mode->isNormal());
+		self::assertTrue($mode->isInstall());
 
-		$this->assertTrue($mode->has(Mode::LOCALCONFIGPRESENT));
+		self::assertTrue($mode->has(Mode::LOCALCONFIGPRESENT));
 	}
 
 	public function testWithMaintenanceMode()
@@ -131,11 +131,11 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertFalse($mode->isNormal());
-		$this->assertFalse($mode->isInstall());
+		self::assertFalse($mode->isNormal());
+		self::assertFalse($mode->isInstall());
 
-		$this->assertTrue($mode->has(Mode::DBCONFIGAVAILABLE));
-		$this->assertFalse($mode->has(Mode::MAINTENANCEDISABLED));
+		self::assertTrue($mode->has(Mode::DBCONFIGAVAILABLE));
+		self::assertFalse($mode->has(Mode::MAINTENANCEDISABLED));
 	}
 
 	public function testNormalMode()
@@ -153,11 +153,11 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertTrue($mode->isNormal());
-		$this->assertFalse($mode->isInstall());
+		self::assertTrue($mode->isNormal());
+		self::assertFalse($mode->isInstall());
 
-		$this->assertTrue($mode->has(Mode::DBCONFIGAVAILABLE));
-		$this->assertTrue($mode->has(Mode::MAINTENANCEDISABLED));
+		self::assertTrue($mode->has(Mode::DBCONFIGAVAILABLE));
+		self::assertTrue($mode->has(Mode::MAINTENANCEDISABLED));
 	}
 
 	/**
@@ -178,11 +178,11 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertTrue($mode->isNormal());
-		$this->assertFalse($mode->isInstall());
+		self::assertTrue($mode->isNormal());
+		self::assertFalse($mode->isInstall());
 
-		$this->assertTrue($mode->has(Mode::DBCONFIGAVAILABLE));
-		$this->assertTrue($mode->has(Mode::MAINTENANCEDISABLED));
+		self::assertTrue($mode->has(Mode::DBCONFIGAVAILABLE));
+		self::assertTrue($mode->has(Mode::MAINTENANCEDISABLED));
 	}
 
 	/**
@@ -196,7 +196,7 @@ class ModeTest extends MockedTest
 
 		$modeNew = $mode->determine($this->basePathMock, $this->databaseMock, $this->configCacheMock);
 
-		$this->assertNotSame($modeNew, $mode);
+		self::assertNotSame($modeNew, $mode);
 	}
 
 	/**
@@ -210,7 +210,7 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(true, $module, $server, $mobileDetect);
 
-		$this->assertTrue($mode->isBackend());
+		self::assertTrue($mode->isBackend());
 	}
 
 	/**
@@ -224,7 +224,7 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(false, $module, $server, $mobileDetect);
 
-		$this->assertTrue($mode->isBackend());
+		self::assertTrue($mode->isBackend());
 	}
 
 	/**
@@ -238,7 +238,7 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(false, $module, $server, $mobileDetect);
 
-		$this->assertFalse($mode->isBackend());
+		self::assertFalse($mode->isBackend());
 	}
 
 	/**
@@ -256,7 +256,7 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(true, $module, $server, $mobileDetect);
 
-		$this->assertTrue($mode->isAjax());
+		self::assertTrue($mode->isAjax());
 	}
 
 	/**
@@ -270,7 +270,7 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(true, $module, $server, $mobileDetect);
 
-		$this->assertFalse($mode->isAjax());
+		self::assertFalse($mode->isAjax());
 	}
 
 	/**
@@ -286,8 +286,8 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(true, $module, $server, $mobileDetect);
 
-		$this->assertTrue($mode->isMobile());
-		$this->assertTrue($mode->isTablet());
+		self::assertTrue($mode->isMobile());
+		self::assertTrue($mode->isTablet());
 	}
 
 
@@ -304,7 +304,7 @@ class ModeTest extends MockedTest
 
 		$mode = (new Mode())->determineRunMode(true, $module, $server, $mobileDetect);
 
-		$this->assertFalse($mode->isMobile());
-		$this->assertFalse($mode->isTablet());
+		self::assertFalse($mode->isMobile());
+		self::assertFalse($mode->isTablet());
 	}
 }
diff --git a/tests/src/App/ModuleTest.php b/tests/src/App/ModuleTest.php
index be49a741aa..a24608eb02 100644
--- a/tests/src/App/ModuleTest.php
+++ b/tests/src/App/ModuleTest.php
@@ -34,9 +34,9 @@ class ModuleTest extends DatabaseTest
 {
 	private function assertModule(array $assert, App\Module $module)
 	{
-		$this->assertEquals($assert['isBackend'], $module->isBackend());
-		$this->assertEquals($assert['name'], $module->getName());
-		$this->assertEquals($assert['class'], $module->getClassName());
+		self::assertEquals($assert['isBackend'], $module->isBackend());
+		self::assertEquals($assert['name'], $module->getName());
+		self::assertEquals($assert['class'], $module->getClassName());
 	}
 
 	/**
@@ -46,7 +46,7 @@ class ModuleTest extends DatabaseTest
 	{
 		$module = new App\Module();
 
-		$this->assertModule([
+		self::assertModule([
 			'isBackend' => false,
 			'name'      => App\Module::DEFAULT,
 			'class'     => App\Module::DEFAULT_CLASS,
@@ -128,7 +128,7 @@ class ModuleTest extends DatabaseTest
 	{
 		$module = (new App\Module())->determineModule($args);
 
-		$this->assertModule($assert, $module);
+		self::assertModule($assert, $module);
 	}
 
 	public function dataModuleClass()
@@ -185,7 +185,7 @@ class ModuleTest extends DatabaseTest
 
 		$module = (new App\Module($name))->determineClass(new App\Arguments('', $command), $router, $config);
 
-		$this->assertEquals($assert, $module->getClassName());
+		self::assertEquals($assert, $module->getClassName());
 	}
 
 	/**
@@ -197,6 +197,6 @@ class ModuleTest extends DatabaseTest
 
 		$moduleNew = $module->determineModule(new App\Arguments());
 
-		$this->assertNotSame($moduleNew, $module);
+		self::assertNotSame($moduleNew, $module);
 	}
 }
diff --git a/tests/src/App/RouterTest.php b/tests/src/App/RouterTest.php
index b9c23a2b23..6846f74ff7 100644
--- a/tests/src/App/RouterTest.php
+++ b/tests/src/App/RouterTest.php
@@ -64,15 +64,15 @@ class RouterTest extends TestCase
 		$routeCollector->addRoute([Router::GET], '/variable/{var}', 'VariableModuleClassName');
 		$routeCollector->addRoute([Router::GET], '/optionalvariable[/{option}]', 'OptionalVariableModuleClassName');
 
-		$this->assertEquals('IndexModuleClassName', $router->getModuleClass('/'));
-		$this->assertEquals('TestModuleClassName', $router->getModuleClass('/test'));
-		$this->assertEquals('TestGetPostModuleClassName', $router->getModuleClass('/testgetpost'));
-		$this->assertEquals('TestSubModuleClassName', $router->getModuleClass('/test/sub'));
-		$this->assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional'));
-		$this->assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional/option'));
-		$this->assertEquals('VariableModuleClassName', $router->getModuleClass('/variable/123abc'));
-		$this->assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable'));
-		$this->assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable/123abc'));
+		self::assertEquals('IndexModuleClassName', $router->getModuleClass('/'));
+		self::assertEquals('TestModuleClassName', $router->getModuleClass('/test'));
+		self::assertEquals('TestGetPostModuleClassName', $router->getModuleClass('/testgetpost'));
+		self::assertEquals('TestSubModuleClassName', $router->getModuleClass('/test/sub'));
+		self::assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional'));
+		self::assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional/option'));
+		self::assertEquals('VariableModuleClassName', $router->getModuleClass('/variable/123abc'));
+		self::assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable'));
+		self::assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable/123abc'));
 	}
 
 	public function testPostModuleClass()
@@ -88,15 +88,15 @@ class RouterTest extends TestCase
 		$routeCollector->addRoute([Router::POST], '/variable/{var}', 'VariableModuleClassName');
 		$routeCollector->addRoute([Router::POST], '/optionalvariable[/{option}]', 'OptionalVariableModuleClassName');
 
-		$this->assertEquals('IndexModuleClassName', $router->getModuleClass('/'));
-		$this->assertEquals('TestModuleClassName', $router->getModuleClass('/test'));
-		$this->assertEquals('TestGetPostModuleClassName', $router->getModuleClass('/testgetpost'));
-		$this->assertEquals('TestSubModuleClassName', $router->getModuleClass('/test/sub'));
-		$this->assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional'));
-		$this->assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional/option'));
-		$this->assertEquals('VariableModuleClassName', $router->getModuleClass('/variable/123abc'));
-		$this->assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable'));
-		$this->assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable/123abc'));
+		self::assertEquals('IndexModuleClassName', $router->getModuleClass('/'));
+		self::assertEquals('TestModuleClassName', $router->getModuleClass('/test'));
+		self::assertEquals('TestGetPostModuleClassName', $router->getModuleClass('/testgetpost'));
+		self::assertEquals('TestSubModuleClassName', $router->getModuleClass('/test/sub'));
+		self::assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional'));
+		self::assertEquals('OptionalModuleClassName', $router->getModuleClass('/optional/option'));
+		self::assertEquals('VariableModuleClassName', $router->getModuleClass('/variable/123abc'));
+		self::assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable'));
+		self::assertEquals('OptionalVariableModuleClassName', $router->getModuleClass('/optionalvariable/123abc'));
 	}
 
 	public function testGetModuleClassNotFound()
@@ -205,10 +205,10 @@ class RouterTest extends TestCase
 			$this->cache
 		))->loadRoutes($routes);
 
-		$this->assertEquals(Module\Home::class, $router->getModuleClass('/'));
-		$this->assertEquals(Module\Friendica::class, $router->getModuleClass('/group/route'));
-		$this->assertEquals(Module\Xrd::class, $router->getModuleClass('/group2/group3/route'));
-		$this->assertEquals(Module\Profile\Index::class, $router->getModuleClass('/double'));
+		self::assertEquals(Module\Home::class, $router->getModuleClass('/'));
+		self::assertEquals(Module\Friendica::class, $router->getModuleClass('/group/route'));
+		self::assertEquals(Module\Xrd::class, $router->getModuleClass('/group2/group3/route'));
+		self::assertEquals(Module\Profile\Index::class, $router->getModuleClass('/double'));
 	}
 
 	/**
@@ -221,7 +221,7 @@ class RouterTest extends TestCase
 		], '', $this->l10n, $this->cache))->loadRoutes($routes);
 
 		// Don't find GET
-		$this->assertEquals(Module\WellKnown\NodeInfo::class, $router->getModuleClass('/post/it'));
-		$this->assertEquals(Module\Profile\Index::class, $router->getModuleClass('/double'));
+		self::assertEquals(Module\WellKnown\NodeInfo::class, $router->getModuleClass('/post/it'));
+		self::assertEquals(Module\Profile\Index::class, $router->getModuleClass('/double'));
 	}
 }
diff --git a/tests/src/Console/AutomaticInstallationConsoleTest.php b/tests/src/Console/AutomaticInstallationConsoleTest.php
index 8d1be751d6..b0481be98c 100644
--- a/tests/src/Console/AutomaticInstallationConsoleTest.php
+++ b/tests/src/Console/AutomaticInstallationConsoleTest.php
@@ -264,7 +264,7 @@ Installation is finished
 
 
 FIN;
-		$this->assertEquals($finished, $txt);
+		self::assertEquals($finished, $txt);
 	}
 
 	private function assertStuckDB($txt)
@@ -295,7 +295,7 @@ Could not connect to database.:
 
 FIN;
 
-		$this->assertEquals($finished, $txt);
+		self::assertEquals($finished, $txt);
 	}
 
 	private function assertStuckURL($txt)
@@ -319,7 +319,7 @@ The Friendica URL has to be set during CLI installation.
 
 FIN;
 
-		$this->assertEquals($finished, $txt);
+		self::assertEquals($finished, $txt);
 	}
 
 	/**
@@ -333,13 +333,13 @@ FIN;
 	public function assertConfigEntry($cat, $key, $assertion = null, $default_value = null)
 	{
 		if (!empty($assertion[$cat][$key])) {
-			$this->assertEquals($assertion[$cat][$key], $this->configCache->get($cat, $key));
+			self::assertEquals($assertion[$cat][$key], $this->configCache->get($cat, $key));
 		} elseif (!empty($assertion) && !is_array($assertion)) {
-			$this->assertEquals($assertion, $this->configCache->get($cat, $key));
+			self::assertEquals($assertion, $this->configCache->get($cat, $key));
 		} elseif (!empty($default_value)) {
-			$this->assertEquals($default_value, $this->configCache->get($cat, $key));
+			self::assertEquals($default_value, $this->configCache->get($cat, $key));
 		} else {
-			$this->assertEmpty($this->configCache->get($cat, $key), $this->configCache->get($cat, $key));
+			self::assertEmpty($this->configCache->get($cat, $key), $this->configCache->get($cat, $key));
 		}
 	}
 
@@ -358,21 +358,21 @@ FIN;
 			$assertion['database']['hostname'] .= (!empty($assertion['database']['port']) ? ':' . $assertion['database']['port'] : '');
 		}
 
-		$this->assertConfigEntry('database', 'hostname', ($saveDb) ? $assertion : null, (!$saveDb || $defaultDb) ? Installer::DEFAULT_HOST : null);
-		$this->assertConfigEntry('database', 'username', ($saveDb) ? $assertion : null);
-		$this->assertConfigEntry('database', 'password', ($saveDb) ? $assertion : null);
-		$this->assertConfigEntry('database', 'database', ($saveDb) ? $assertion : null);
+		self::assertConfigEntry('database', 'hostname', ($saveDb) ? $assertion : null, (!$saveDb || $defaultDb) ? Installer::DEFAULT_HOST : null);
+		self::assertConfigEntry('database', 'username', ($saveDb) ? $assertion : null);
+		self::assertConfigEntry('database', 'password', ($saveDb) ? $assertion : null);
+		self::assertConfigEntry('database', 'database', ($saveDb) ? $assertion : null);
 
-		$this->assertConfigEntry('config', 'admin_email', $assertion);
-		$this->assertConfigEntry('config', 'php_path', trim(shell_exec('which php')));
-		$this->assertConfigEntry('config', 'hostname', $assertion);
+		self::assertConfigEntry('config', 'admin_email', $assertion);
+		self::assertConfigEntry('config', 'php_path', trim(shell_exec('which php')));
+		self::assertConfigEntry('config', 'hostname', $assertion);
 
-		$this->assertConfigEntry('system', 'default_timezone', $assertion, ($default) ? Installer::DEFAULT_TZ : null);
-		$this->assertConfigEntry('system', 'language', $assertion, ($default) ? Installer::DEFAULT_LANG : null);
-		$this->assertConfigEntry('system', 'url', $assertion);
-		$this->assertConfigEntry('system', 'urlpath', $assertion);
-		$this->assertConfigEntry('system', 'ssl_policy', $assertion, ($default) ? App\BaseURL::DEFAULT_SSL_SCHEME : null);
-		$this->assertConfigEntry('system', 'basepath', ($realBasepath) ? $this->root->url() : $assertion);
+		self::assertConfigEntry('system', 'default_timezone', $assertion, ($default) ? Installer::DEFAULT_TZ : null);
+		self::assertConfigEntry('system', 'language', $assertion, ($default) ? Installer::DEFAULT_LANG : null);
+		self::assertConfigEntry('system', 'url', $assertion);
+		self::assertConfigEntry('system', 'urlpath', $assertion);
+		self::assertConfigEntry('system', 'ssl_policy', $assertion, ($default) ? App\BaseURL::DEFAULT_SSL_SCHEME : null);
+		self::assertConfigEntry('system', 'basepath', ($realBasepath) ? $this->root->url() : $assertion);
 	}
 
 	/**
@@ -385,7 +385,7 @@ FIN;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertStuckURL($txt);
+		self::assertStuckURL($txt);
 	}
 
 	/**
@@ -407,10 +407,10 @@ FIN;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertFinished($txt, true, false);
-		$this->assertTrue($this->root->hasChild('config' . DIRECTORY_SEPARATOR . 'local.config.php'));
+		self::assertFinished($txt, true, false);
+		self::assertTrue($this->root->hasChild('config' . DIRECTORY_SEPARATOR . 'local.config.php'));
 
-		$this->assertConfig(['config' => ['hostname' => 'friendica.local'], 'system' => ['url' => 'http://friendica.local', 'ssl_policy' => 0, 'urlPath' => '']], false, true, true, true);
+		self::assertConfig(['config' => ['hostname' => 'friendica.local'], 'system' => ['url' => 'http://friendica.local', 'ssl_policy' => 0, 'urlPath' => '']], false, true, true, true);
 	}
 
 	/**
@@ -481,12 +481,12 @@ CONF;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertFinished($txt, false, true);
+		self::assertFinished($txt, false, true);
 
-		$this->assertTrue($this->root->hasChild('config' . DIRECTORY_SEPARATOR . 'local.config.php'));
-		$this->assertEquals($config, file_get_contents($this->root->getChild('config' . DIRECTORY_SEPARATOR . 'local.config.php')->url()));
+		self::assertTrue($this->root->hasChild('config' . DIRECTORY_SEPARATOR . 'local.config.php'));
+		self::assertEquals($config, file_get_contents($this->root->getChild('config' . DIRECTORY_SEPARATOR . 'local.config.php')->url()));
 
-		$this->assertConfig($data, true, false, false);
+		self::assertConfig($data, true, false, false);
 	}
 
 	/**
@@ -504,27 +504,27 @@ CONF;
 		$this->mockGetMarkupTemplate('local.config.tpl', 'testTemplate', 1);
 		$this->mockReplaceMacros('testTemplate', \Mockery::any(), '', 1);
 
-		$this->assertTrue(putenv('MYSQL_HOST='     . $data['database']['hostname']));
-		$this->assertTrue(putenv('MYSQL_PORT='     . $data['database']['port']));
-		$this->assertTrue(putenv('MYSQL_DATABASE=' . $data['database']['database']));
-		$this->assertTrue(putenv('MYSQL_USERNAME=' . $data['database']['username']));
-		$this->assertTrue(putenv('MYSQL_PASSWORD=' . $data['database']['password']));
+		self::assertTrue(putenv('MYSQL_HOST='     . $data['database']['hostname']));
+		self::assertTrue(putenv('MYSQL_PORT='     . $data['database']['port']));
+		self::assertTrue(putenv('MYSQL_DATABASE=' . $data['database']['database']));
+		self::assertTrue(putenv('MYSQL_USERNAME=' . $data['database']['username']));
+		self::assertTrue(putenv('MYSQL_PASSWORD=' . $data['database']['password']));
 
-		$this->assertTrue(putenv('FRIENDICA_HOSTNAME='   . $data['config']['hostname']));
-		$this->assertTrue(putenv('FRIENDICA_BASE_PATH='  . $data['system']['basepath']));
-		$this->assertTrue(putenv('FRIENDICA_URL='        . $data['system']['url']));
-		$this->assertTrue(putenv('FRIENDICA_PHP_PATH='   . $data['config']['php_path']));
-		$this->assertTrue(putenv('FRIENDICA_ADMIN_MAIL=' . $data['config']['admin_email']));
-		$this->assertTrue(putenv('FRIENDICA_TZ='         . $data['system']['default_timezone']));
-		$this->assertTrue(putenv('FRIENDICA_LANG='       . $data['system']['language']));
+		self::assertTrue(putenv('FRIENDICA_HOSTNAME='   . $data['config']['hostname']));
+		self::assertTrue(putenv('FRIENDICA_BASE_PATH='  . $data['system']['basepath']));
+		self::assertTrue(putenv('FRIENDICA_URL='        . $data['system']['url']));
+		self::assertTrue(putenv('FRIENDICA_PHP_PATH='   . $data['config']['php_path']));
+		self::assertTrue(putenv('FRIENDICA_ADMIN_MAIL=' . $data['config']['admin_email']));
+		self::assertTrue(putenv('FRIENDICA_TZ='         . $data['system']['default_timezone']));
+		self::assertTrue(putenv('FRIENDICA_LANG='       . $data['system']['language']));
 
 		$console = new AutomaticInstallation($this->consoleArgv);
 		$console->setOption('savedb', true);
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertFinished($txt, true);
-		$this->assertConfig($data, true, true, false, true);
+		self::assertFinished($txt, true);
+		self::assertConfig($data, true, true, false, true);
 	}
 
 	/**
@@ -542,26 +542,26 @@ CONF;
 		$this->mockGetMarkupTemplate('local.config.tpl', 'testTemplate', 1);
 		$this->mockReplaceMacros('testTemplate', \Mockery::any(), '', 1);
 
-		$this->assertTrue(putenv('MYSQL_HOST=' . $data['database']['hostname']));
-		$this->assertTrue(putenv('MYSQL_PORT=' . $data['database']['port']));
-		$this->assertTrue(putenv('MYSQL_DATABASE=' . $data['database']['database']));
-		$this->assertTrue(putenv('MYSQL_USERNAME=' . $data['database']['username']));
-		$this->assertTrue(putenv('MYSQL_PASSWORD=' . $data['database']['password']));
+		self::assertTrue(putenv('MYSQL_HOST=' . $data['database']['hostname']));
+		self::assertTrue(putenv('MYSQL_PORT=' . $data['database']['port']));
+		self::assertTrue(putenv('MYSQL_DATABASE=' . $data['database']['database']));
+		self::assertTrue(putenv('MYSQL_USERNAME=' . $data['database']['username']));
+		self::assertTrue(putenv('MYSQL_PASSWORD=' . $data['database']['password']));
 
-		$this->assertTrue(putenv('FRIENDICA_HOSTNAME='   . $data['config']['hostname']));
-		$this->assertTrue(putenv('FRIENDICA_BASE_PATH='  . $data['system']['basepath']));
-		$this->assertTrue(putenv('FRIENDICA_URL='        . $data['system']['url']));
-		$this->assertTrue(putenv('FRIENDICA_PHP_PATH='   . $data['config']['php_path']));
-		$this->assertTrue(putenv('FRIENDICA_ADMIN_MAIL=' . $data['config']['admin_email']));
-		$this->assertTrue(putenv('FRIENDICA_TZ='         . $data['system']['default_timezone']));
-		$this->assertTrue(putenv('FRIENDICA_LANG='       . $data['system']['language']));
+		self::assertTrue(putenv('FRIENDICA_HOSTNAME='   . $data['config']['hostname']));
+		self::assertTrue(putenv('FRIENDICA_BASE_PATH='  . $data['system']['basepath']));
+		self::assertTrue(putenv('FRIENDICA_URL='        . $data['system']['url']));
+		self::assertTrue(putenv('FRIENDICA_PHP_PATH='   . $data['config']['php_path']));
+		self::assertTrue(putenv('FRIENDICA_ADMIN_MAIL=' . $data['config']['admin_email']));
+		self::assertTrue(putenv('FRIENDICA_TZ='         . $data['system']['default_timezone']));
+		self::assertTrue(putenv('FRIENDICA_LANG='       . $data['system']['language']));
 
 		$console = new AutomaticInstallation($this->consoleArgv);
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertFinished($txt, true);
-		$this->assertConfig($data, false, true, false, true);
+		self::assertFinished($txt, true);
+		self::assertConfig($data, false, true, false, true);
 	}
 
 	/**
@@ -599,8 +599,8 @@ CONF;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertFinished($txt, true);
-		$this->assertConfig($data, true, true, true, true);
+		self::assertFinished($txt, true);
+		self::assertConfig($data, true, true, true, true);
 	}
 
 	/**
@@ -618,10 +618,10 @@ CONF;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertStuckDB($txt);
-		$this->assertTrue($this->root->hasChild('config' . DIRECTORY_SEPARATOR . 'local.config.php'));
+		self::assertStuckDB($txt);
+		self::assertTrue($this->root->hasChild('config' . DIRECTORY_SEPARATOR . 'local.config.php'));
 
-		$this->assertConfig(['config' => ['hostname' => 'friendica.local'], 'system' => ['url' => 'http://friendica.local', 'ssl_policy' => 0, 'urlpath' => '']], false, true, false, true);
+		self::assertConfig(['config' => ['hostname' => 'friendica.local'], 'system' => ['url' => 'http://friendica.local', 'ssl_policy' => 0, 'urlpath' => '']], false, true, false, true);
 	}
 
 	public function testGetHelp()
@@ -685,6 +685,6 @@ HELP;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals($theHelp, $txt);
+		self::assertEquals($theHelp, $txt);
 	}
 }
diff --git a/tests/src/Console/ConfigConsoleTest.php b/tests/src/Console/ConfigConsoleTest.php
index cfdbf60377..837d234b83 100644
--- a/tests/src/Console/ConfigConsoleTest.php
+++ b/tests/src/Console/ConfigConsoleTest.php
@@ -71,7 +71,7 @@ class ConfigConsoleTest extends ConsoleTest
 		$console->setArgument(1, 'test');
 		$console->setArgument(2, 'now');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("config.test <= now\n", $txt);
+		self::assertEquals("config.test <= now\n", $txt);
 
 		$this->configMock
 			->shouldReceive('get')
@@ -83,7 +83,7 @@ class ConfigConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'config');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("config.test => now\n", $txt);
+		self::assertEquals("config.test => now\n", $txt);
 
 		$this->configMock
 			->shouldReceive('get')
@@ -95,7 +95,7 @@ class ConfigConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'config');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("config.test => \n", $txt);
+		self::assertEquals("config.test => \n", $txt);
 	}
 
 	function testSetArrayValue() {
@@ -112,7 +112,7 @@ class ConfigConsoleTest extends ConsoleTest
 		$console->setArgument(2, 'now');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals("[Error] config.test is an array and can't be set using this command.\n", $txt);
+		self::assertEquals("[Error] config.test is an array and can't be set using this command.\n", $txt);
 	}
 
 	function testTooManyArguments() {
@@ -124,7 +124,7 @@ class ConfigConsoleTest extends ConsoleTest
 		$txt = $this->dumpExecute($console);
 		$assertion = '[Warning] Too many arguments';
 		$firstline = substr($txt, 0, strlen($assertion));
-		$this->assertEquals($assertion, $firstline);
+		self::assertEquals($assertion, $firstline);
 	}
 
 	function testVerbose() {
@@ -152,7 +152,7 @@ test.it => now
 
 CONF;
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals($assertion, $txt);
+		self::assertEquals($assertion, $txt);
 	}
 
 	function testUnableToSet() {
@@ -171,7 +171,7 @@ CONF;
 		$console->setArgument(1, 'it');
 		$console->setArgument(2, 'now');
 		$txt = $this->dumpExecute($console);
-		$this->assertSame("Unable to set test.it\n", $txt);
+		self::assertSame("Unable to set test.it\n", $txt);
 	}
 
 	public function testGetHelp()
@@ -212,6 +212,6 @@ HELP;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals($txt, $theHelp);
+		self::assertEquals($txt, $theHelp);
 	}
 }
diff --git a/tests/src/Console/LockConsoleTest.php b/tests/src/Console/LockConsoleTest.php
index 6ba0eb04dd..e06ee3a4ca 100644
--- a/tests/src/Console/LockConsoleTest.php
+++ b/tests/src/Console/LockConsoleTest.php
@@ -66,7 +66,7 @@ class LockConsoleTest extends ConsoleTest
 		$console = new Lock($this->appMode, $this->lockMock, $this->consoleArgv);
 		$console->setArgument(0, 'list');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("Listing all Locks:\ntest\ntest2\n2 locks found\n", $txt);
+		self::assertEquals("Listing all Locks:\ntest\ntest2\n2 locks found\n", $txt);
 	}
 
 	public function testListPrefix()
@@ -81,7 +81,7 @@ class LockConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'list');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("Listing all Locks starting with \"test\":\ntest\ntest2\n2 locks found\n", $txt);
+		self::assertEquals("Listing all Locks starting with \"test\":\ntest\ntest2\n2 locks found\n", $txt);
 	}
 
 	public function testDelLock()
@@ -96,7 +96,7 @@ class LockConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'del');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("Lock 'test' released.\n", $txt);
+		self::assertEquals("Lock 'test' released.\n", $txt);
 	}
 
 	public function testDelUnknownLock()
@@ -111,7 +111,7 @@ class LockConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'del');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("Couldn't release Lock 'test'\n", $txt);
+		self::assertEquals("Couldn't release Lock 'test'\n", $txt);
 	}
 
 	public function testSetLock()
@@ -131,7 +131,7 @@ class LockConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'set');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("Lock 'test' acquired.\n", $txt);
+		self::assertEquals("Lock 'test' acquired.\n", $txt);
 	}
 
 	public function testSetLockIsLocked()
@@ -146,7 +146,7 @@ class LockConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'set');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("[Error] 'test' is already set.\n", $txt);
+		self::assertEquals("[Error] 'test' is already set.\n", $txt);
 	}
 
 	public function testSetLockNotWorking()
@@ -166,7 +166,7 @@ class LockConsoleTest extends ConsoleTest
 		$console->setArgument(0, 'set');
 		$console->setArgument(1, 'test');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("[Error] Unable to lock 'test'.\n", $txt);
+		self::assertEquals("[Error] Unable to lock 'test'.\n", $txt);
 	}
 
 	public function testReleaseAll()
@@ -179,7 +179,7 @@ class LockConsoleTest extends ConsoleTest
 		$console = new Lock($this->appMode, $this->lockMock, $this->consoleArgv);
 		$console->setArgument(0, 'clear');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("Locks successfully cleared.\n", $txt);
+		self::assertEquals("Locks successfully cleared.\n", $txt);
 	}
 
 	public function testReleaseAllFailed()
@@ -192,7 +192,7 @@ class LockConsoleTest extends ConsoleTest
 		$console = new Lock($this->appMode, $this->lockMock, $this->consoleArgv);
 		$console->setArgument(0, 'clear');
 		$txt = $this->dumpExecute($console);
-		$this->assertEquals("[Error] Unable to clear the locks.\n", $txt);
+		self::assertEquals("[Error] Unable to clear the locks.\n", $txt);
 	}
 
 	public function testGetHelp()
@@ -229,6 +229,6 @@ HELP;
 
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals($txt, $theHelp);
+		self::assertEquals($txt, $theHelp);
 	}
 }
diff --git a/tests/src/Console/ServerBlockConsoleTest.php b/tests/src/Console/ServerBlockConsoleTest.php
index 7b125b8b12..8efa8a4a76 100644
--- a/tests/src/Console/ServerBlockConsoleTest.php
+++ b/tests/src/Console/ServerBlockConsoleTest.php
@@ -69,7 +69,7 @@ class ServerBlockConsoleTest extends ConsoleTest
 
 CONS;
 
-		$this->assertEquals($output, $txt);
+		self::assertEquals($output, $txt);
 	}
 
 	/**
@@ -101,7 +101,7 @@ CONS;
 		$console->setArgument(2, 'I like it!');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('The domain \'testme.now\' is now blocked. (Reason: \'I like it!\')' . PHP_EOL, $txt);
+		self::assertEquals('The domain \'testme.now\' is now blocked. (Reason: \'I like it!\')' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -132,7 +132,7 @@ CONS;
 		$console->setArgument(1, 'testme.now');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('The domain \'testme.now\' is now blocked. (Reason: \'' . ServerBlock::DEFAULT_REASON . '\')' . PHP_EOL, $txt);
+		self::assertEquals('The domain \'testme.now\' is now blocked. (Reason: \'' . ServerBlock::DEFAULT_REASON . '\')' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -169,7 +169,7 @@ CONS;
 		$console->setArgument(2, 'Other reason');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('The domain \'pod.ordoevangelistarum.com\' is now updated. (Reason: \'Other reason\')' . PHP_EOL, $txt);
+		self::assertEquals('The domain \'pod.ordoevangelistarum.com\' is now updated. (Reason: \'Other reason\')' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -201,7 +201,7 @@ CONS;
 		$console->setArgument(1, 'pod.ordoevangelistarum.com');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('The domain \'pod.ordoevangelistarum.com\' is not more blocked' . PHP_EOL, $txt);
+		self::assertEquals('The domain \'pod.ordoevangelistarum.com\' is not more blocked' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -213,7 +213,7 @@ CONS;
 		$console->setArgument(0, 'wrongcommand');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertStringStartsWith('[Warning] Unknown command', $txt);
+		self::assertStringStartsWith('[Warning] Unknown command', $txt);
 	}
 
 	/**
@@ -232,7 +232,7 @@ CONS;
 		$console->setArgument(1, 'not.exiting');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('The domain \'not.exiting\' is not blocked.' . PHP_EOL, $txt);
+		self::assertEquals('The domain \'not.exiting\' is not blocked.' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -244,7 +244,7 @@ CONS;
 		$console->setArgument(0, 'add');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertStringStartsWith('[Warning] Add needs a domain and optional a reason.', $txt);
+		self::assertStringStartsWith('[Warning] Add needs a domain and optional a reason.', $txt);
 	}
 
 	/**
@@ -275,7 +275,7 @@ CONS;
 		$console->setArgument(1, 'testme.now');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('Couldn\'t save \'testme.now\' as blocked server' . PHP_EOL, $txt);
+		self::assertEquals('Couldn\'t save \'testme.now\' as blocked server' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -307,7 +307,7 @@ CONS;
 		$console->setArgument(1, 'pod.ordoevangelistarum.com');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertEquals('Couldn\'t remove \'pod.ordoevangelistarum.com\' from blocked servers' . PHP_EOL, $txt);
+		self::assertEquals('Couldn\'t remove \'pod.ordoevangelistarum.com\' from blocked servers' . PHP_EOL, $txt);
 	}
 
 	/**
@@ -319,7 +319,7 @@ CONS;
 		$console->setArgument(0, 'remove');
 		$txt = $this->dumpExecute($console);
 
-		$this->assertStringStartsWith('[Warning] Remove needs a second parameter.', $txt);
+		self::assertStringStartsWith('[Warning] Remove needs a second parameter.', $txt);
 	}
 
 	/**
@@ -357,6 +357,6 @@ Options
 
 HELP;
 
-		$this->assertEquals($help, $txt);
+		self::assertEquals($help, $txt);
 	}
 }
diff --git a/tests/src/Content/PageInfoTest.php b/tests/src/Content/PageInfoTest.php
index 3604348fff..f7133566a5 100644
--- a/tests/src/Content/PageInfoTest.php
+++ b/tests/src/Content/PageInfoTest.php
@@ -87,7 +87,7 @@ class PageInfoTest extends MockedTest
 	 */
 	public function testGetRelevantUrlFromBody($expected, string $body, bool $searchNakedUrls = false)
 	{
-		$this->assertSame($expected, PageInfoMock::getRelevantUrlFromBody($body, $searchNakedUrls));
+		self::assertSame($expected, PageInfoMock::getRelevantUrlFromBody($body, $searchNakedUrls));
 	}
 
 	public function dataStripTrailingUrlFromBody()
@@ -135,6 +135,6 @@ class PageInfoTest extends MockedTest
 	 */
 	public function testStripTrailingUrlFromBody(string $expected, string $body, string $url)
 	{
-		$this->assertSame($expected, PageInfoMock::stripTrailingUrlFromBody($body, $url));
+		self::assertSame($expected, PageInfoMock::stripTrailingUrlFromBody($body, $url));
 	}
 }
diff --git a/tests/src/Content/SmiliesTest.php b/tests/src/Content/SmiliesTest.php
index 4e0859d7c4..27bdead3c1 100644
--- a/tests/src/Content/SmiliesTest.php
+++ b/tests/src/Content/SmiliesTest.php
@@ -62,6 +62,6 @@ class SmiliesTest extends MockedTest
 	public function testReplaceFromArray($text, $smilies, $expected)
 	{
 		$output = Smilies::replaceFromArray($text, $smilies);
-		$this->assertEquals($expected, $output);
+		self::assertEquals($expected, $output);
 	}
 }
diff --git a/tests/src/Content/Text/BBCode/VideoTest.php b/tests/src/Content/Text/BBCode/VideoTest.php
index 3d1b24fb79..ca2ab10007 100644
--- a/tests/src/Content/Text/BBCode/VideoTest.php
+++ b/tests/src/Content/Text/BBCode/VideoTest.php
@@ -57,6 +57,6 @@ class VideoTest extends MockedTest
 	{
 		$bbCodeVideo = new Video();
 
-		$this->assertEquals($assert, $bbCodeVideo->transform($input));
+		self::assertEquals($assert, $bbCodeVideo->transform($input));
 	}
 }
diff --git a/tests/src/Content/Text/BBCodeTest.php b/tests/src/Content/Text/BBCodeTest.php
index 77613e891a..17c2bca19b 100644
--- a/tests/src/Content/Text/BBCodeTest.php
+++ b/tests/src/Content/Text/BBCodeTest.php
@@ -169,9 +169,9 @@ class BBCodeTest extends MockedTest
 		$output = BBCode::convert($data);
 		$assert = '<a href="' . $data . '" target="_blank" rel="noopener noreferrer">' . $data . '</a>';
 		if ($assertHTML) {
-			$this->assertEquals($assert, $output);
+			self::assertEquals($assert, $output);
 		} else {
-			$this->assertNotEquals($assert, $output);
+			self::assertNotEquals($assert, $output);
 		}
 	}
 
@@ -264,7 +264,7 @@ class BBCodeTest extends MockedTest
 	{
 		$actual = BBCode::convert($text, $try_oembed, $simpleHtml, $forPlaintext);
 
-		$this->assertEquals($expectedHtml, $actual);
+		self::assertEquals($expectedHtml, $actual);
 	}
 
 	public function dataBBCodesToMarkdown()
@@ -299,6 +299,6 @@ class BBCodeTest extends MockedTest
 	{
 		$actual = BBCode::toMarkdown($text, $for_diaspora);
 
-		$this->assertEquals($expected, $actual);
+		self::assertEquals($expected, $actual);
 	}
 }
diff --git a/tests/src/Content/Text/HTMLTest.php b/tests/src/Content/Text/HTMLTest.php
index f640c4fb19..ca313bec57 100644
--- a/tests/src/Content/Text/HTMLTest.php
+++ b/tests/src/Content/Text/HTMLTest.php
@@ -67,7 +67,7 @@ class HTMLTest extends MockedTest
 	{
 		$output = HTML::toPlaintext($input, 0);
 
-		$this->assertEquals($expected, $output);
+		self::assertEquals($expected, $output);
 	}
 
 	public function dataHTMLText()
@@ -97,6 +97,6 @@ class HTMLTest extends MockedTest
 	{
 		$actual = HTML::toBBCode($html);
 
-		$this->assertEquals($expectedBBCode, $actual);
+		self::assertEquals($expectedBBCode, $actual);
 	}
 }
diff --git a/tests/src/Content/Text/MarkdownTest.php b/tests/src/Content/Text/MarkdownTest.php
index e98b15bdf6..1f1146af9a 100644
--- a/tests/src/Content/Text/MarkdownTest.php
+++ b/tests/src/Content/Text/MarkdownTest.php
@@ -67,7 +67,7 @@ class MarkdownTest extends MockedTest
 	{
 		$output = Markdown::convert($input);
 
-		$this->assertEquals($expected, $output);
+		self::assertEquals($expected, $output);
 	}
 
 	public function dataMarkdownText()
@@ -93,6 +93,6 @@ class MarkdownTest extends MockedTest
 	{
 		$actual = Markdown::toBBCode($html);
 
-		$this->assertEquals($expectedBBCode, $actual);
+		self::assertEquals($expectedBBCode, $actual);
 	}
 }
diff --git a/tests/src/Core/Cache/CacheTest.php b/tests/src/Core/Cache/CacheTest.php
index e9a26f2f46..3daf1db6f4 100644
--- a/tests/src/Core/Cache/CacheTest.php
+++ b/tests/src/Core/Cache/CacheTest.php
@@ -97,25 +97,25 @@ abstract class CacheTest extends MockedTest
 	 */
 	function testSimple($value1, $value2)
 	{
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$this->instance->set('value1', $value1);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value1, $received, 'Value received from cache not equal to the original');
+		self::assertEquals($value1, $received, 'Value received from cache not equal to the original');
 
 		$this->instance->set('value1', $value2);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value2, $received, 'Value not overwritten by second set');
+		self::assertEquals($value2, $received, 'Value not overwritten by second set');
 
 		$this->instance->set('value2', $value1);
 		$received2 = $this->instance->get('value2');
-		$this->assertEquals($value2, $received, 'Value changed while setting other variable');
-		$this->assertEquals($value1, $received2, 'Second value not equal to original');
+		self::assertEquals($value2, $received, 'Value changed while setting other variable');
+		self::assertEquals($value1, $received2, 'Second value not equal to original');
 
-		$this->assertNull($this->instance->get('not_set'), 'Unset value not equal to null');
+		self::assertNull($this->instance->get('not_set'), 'Unset value not equal to null');
 
-		$this->assertTrue($this->instance->delete('value1'));
-		$this->assertNull($this->instance->get('value1'));
+		self::assertTrue($this->instance->delete('value1'));
+		self::assertNull($this->instance->get('value1'));
 	}
 
 	/**
@@ -135,7 +135,7 @@ abstract class CacheTest extends MockedTest
 		$this->instance->set('2_value1', $value3);
 		$this->instance->set('3_value1', $value4);
 
-		$this->assertEquals([
+		self::assertEquals([
 			'1_value1' => $value1,
 			'1_value2' => $value2,
 			'2_value1' => $value3,
@@ -147,9 +147,9 @@ abstract class CacheTest extends MockedTest
 			'3_value1' => $this->instance->get('3_value1'),
 		]);
 
-		$this->assertTrue($this->instance->clear());
+		self::assertTrue($this->instance->clear());
 
-		$this->assertEquals([
+		self::assertEquals([
 			'1_value1' => $value1,
 			'1_value2' => $value2,
 			'2_value1' => $value3,
@@ -161,9 +161,9 @@ abstract class CacheTest extends MockedTest
 			'3_value1' => $this->instance->get('3_value1'),
 		]);
 
-		$this->assertTrue($this->instance->clear(false));
+		self::assertTrue($this->instance->clear(false));
 
-		$this->assertEquals([
+		self::assertEquals([
 			'1_value1' => null,
 			'1_value2' => null,
 			'2_value3' => null,
@@ -183,16 +183,16 @@ abstract class CacheTest extends MockedTest
 	{
 		$this->markTestSkipped('taking too much time without mocking');
 
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$value = 'foobar';
 		$this->instance->set('value1', $value, 1);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value, $received, 'Value received from cache not equal to the original');
+		self::assertEquals($value, $received, 'Value received from cache not equal to the original');
 
 		sleep(2);
 
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 	}
 
 	/**
@@ -206,7 +206,7 @@ abstract class CacheTest extends MockedTest
 	{
 		$this->instance->set('val', $data);
 		$received = $this->instance->get('val');
-		$this->assertEquals($data, $received, 'Value type changed from ' . gettype($data) . ' to ' . gettype($received));
+		self::assertEquals($data, $received, 'Value type changed from ' . gettype($data) . ' to ' . gettype($received));
 	}
 
 	/**
@@ -220,20 +220,20 @@ abstract class CacheTest extends MockedTest
 	 */
 	public function testGetAllKeys($value1, $value2, $value3)
 	{
-		$this->assertTrue($this->instance->set('value1', $value1));
-		$this->assertTrue($this->instance->set('value2', $value2));
-		$this->assertTrue($this->instance->set('test_value3', $value3));
+		self::assertTrue($this->instance->set('value1', $value1));
+		self::assertTrue($this->instance->set('value2', $value2));
+		self::assertTrue($this->instance->set('test_value3', $value3));
 
 		$list = $this->instance->getAllKeys();
 
-		$this->assertContains('value1', $list);
-		$this->assertContains('value2', $list);
-		$this->assertContains('test_value3', $list);
+		self::assertContains('value1', $list);
+		self::assertContains('value2', $list);
+		self::assertContains('test_value3', $list);
 
 		$list = $this->instance->getAllKeys('test');
 
-		$this->assertContains('test_value3', $list);
-		$this->assertNotContains('value1', $list);
-		$this->assertNotContains('value2', $list);
+		self::assertContains('test_value3', $list);
+		self::assertNotContains('value1', $list);
+		self::assertNotContains('value2', $list);
 	}
 }
diff --git a/tests/src/Core/Cache/MemoryCacheTest.php b/tests/src/Core/Cache/MemoryCacheTest.php
index 8f73d76777..003db6ad83 100644
--- a/tests/src/Core/Cache/MemoryCacheTest.php
+++ b/tests/src/Core/Cache/MemoryCacheTest.php
@@ -45,15 +45,15 @@ abstract class MemoryCacheTest extends CacheTest
 	 */
 	function testCompareSet($value1, $value2)
 	{
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$this->instance->add('value1', $value1);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value1, $received, 'Value received from cache not equal to the original');
+		self::assertEquals($value1, $received, 'Value received from cache not equal to the original');
 
 		$this->instance->compareSet('value1', $value1, $value2);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value2, $received, 'Value not overwritten by compareSet');
+		self::assertEquals($value2, $received, 'Value not overwritten by compareSet');
 	}
 
 	/**
@@ -62,16 +62,16 @@ abstract class MemoryCacheTest extends CacheTest
 	 */
 	function testNegativeCompareSet($value1, $value2)
 	{
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$this->instance->add('value1', $value1);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value1, $received, 'Value received from cache not equal to the original');
+		self::assertEquals($value1, $received, 'Value received from cache not equal to the original');
 
 		$this->instance->compareSet('value1', 'wrong', $value2);
 		$received = $this->instance->get('value1');
-		$this->assertNotEquals($value2, $received, 'Value was wrongly overwritten by compareSet');
-		$this->assertEquals($value1, $received, 'Value was wrongly overwritten by any other value');
+		self::assertNotEquals($value2, $received, 'Value was wrongly overwritten by compareSet');
+		self::assertEquals($value1, $received, 'Value was wrongly overwritten by any other value');
 	}
 
 	/**
@@ -80,13 +80,13 @@ abstract class MemoryCacheTest extends CacheTest
 	 */
 	function testCompareDelete($data)
 	{
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$this->instance->add('value1', $data);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($data, $received, 'Value received from cache not equal to the original');
+		self::assertEquals($data, $received, 'Value received from cache not equal to the original');
 		$this->instance->compareDelete('value1', $data);
-		$this->assertNull($this->instance->get('value1'), 'Value was not deleted by compareDelete');
+		self::assertNull($this->instance->get('value1'), 'Value was not deleted by compareDelete');
 	}
 
 	/**
@@ -95,16 +95,16 @@ abstract class MemoryCacheTest extends CacheTest
 	 */
 	function testNegativeCompareDelete($data)
 	{
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$this->instance->add('value1', $data);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($data, $received, 'Value received from cache not equal to the original');
+		self::assertEquals($data, $received, 'Value received from cache not equal to the original');
 		$this->instance->compareDelete('value1', 'wrong');
-		$this->assertNotNull($this->instance->get('value1'), 'Value was wrongly compareDeleted');
+		self::assertNotNull($this->instance->get('value1'), 'Value was wrongly compareDeleted');
 
 		$this->instance->compareDelete('value1', $data);
-		$this->assertNull($this->instance->get('value1'), 'Value was wrongly NOT deleted by compareDelete');
+		self::assertNull($this->instance->get('value1'), 'Value was wrongly NOT deleted by compareDelete');
 	}
 
 	/**
@@ -113,19 +113,19 @@ abstract class MemoryCacheTest extends CacheTest
 	 */
 	function testAdd($value1, $value2)
 	{
-		$this->assertNull($this->instance->get('value1'));
+		self::assertNull($this->instance->get('value1'));
 
 		$this->instance->add('value1', $value1);
 
 		$this->instance->add('value1', $value2);
 		$received = $this->instance->get('value1');
-		$this->assertNotEquals($value2, $received, 'Value was wrongly overwritten by add');
-		$this->assertEquals($value1, $received, 'Value was wrongly overwritten by any other value');
+		self::assertNotEquals($value2, $received, 'Value was wrongly overwritten by add');
+		self::assertEquals($value1, $received, 'Value was wrongly overwritten by any other value');
 
 		$this->instance->delete('value1');
 		$this->instance->add('value1', $value2);
 		$received = $this->instance->get('value1');
-		$this->assertEquals($value2, $received, 'Value was not overwritten by add');
-		$this->assertNotEquals($value1, $received, 'Value was not overwritten by any other value');
+		self::assertEquals($value2, $received, 'Value was not overwritten by add');
+		self::assertNotEquals($value1, $received, 'Value was not overwritten by any other value');
 	}
 }
diff --git a/tests/src/Core/Config/CacheTest.php b/tests/src/Core/Config/CacheTest.php
index 1acdd1f4fc..383046b042 100644
--- a/tests/src/Core/Config/CacheTest.php
+++ b/tests/src/Core/Config/CacheTest.php
@@ -52,7 +52,7 @@ class CacheTest extends MockedTest
 	{
 		foreach ($data as $cat => $values) {
 			foreach ($values as $key => $value) {
-				$this->assertEquals($data[$cat][$key], $configCache->get($cat, $key));
+				self::assertEquals($data[$cat][$key], $configCache->get($cat, $key));
 			}
 		}
 	}
@@ -66,7 +66,7 @@ class CacheTest extends MockedTest
 		$configCache = new Cache();
 		$configCache->load($data);
 
-		$this->assertConfigValues($data, $configCache);
+		self::assertConfigValues($data, $configCache);
 	}
 
 	/**
@@ -87,26 +87,26 @@ class CacheTest extends MockedTest
 		// doesn't override - Low Priority due Config file
 		$configCache->load($override, Cache::SOURCE_FILE);
 
-		$this->assertConfigValues($data, $configCache);
+		self::assertConfigValues($data, $configCache);
 
 		// override the value - High Prio due Server Env
 		$configCache->load($override, Cache::SOURCE_ENV);
 
-		$this->assertEquals($override['system']['test'], $configCache->get('system', 'test'));
-		$this->assertEquals($override['system']['boolTrue'], $configCache->get('system', 'boolTrue'));
+		self::assertEquals($override['system']['test'], $configCache->get('system', 'test'));
+		self::assertEquals($override['system']['boolTrue'], $configCache->get('system', 'boolTrue'));
 
 		// Don't overwrite server ENV variables - even in load mode
 		$configCache->load($data, Cache::SOURCE_DB);
 
-		$this->assertEquals($override['system']['test'], $configCache->get('system', 'test'));
-		$this->assertEquals($override['system']['boolTrue'], $configCache->get('system', 'boolTrue'));
+		self::assertEquals($override['system']['test'], $configCache->get('system', 'test'));
+		self::assertEquals($override['system']['boolTrue'], $configCache->get('system', 'boolTrue'));
 
 		// Overwrite ENV variables with ENV variables
 		$configCache->load($data, Cache::SOURCE_ENV);
 
-		$this->assertConfigValues($data, $configCache);
-		$this->assertNotEquals($override['system']['test'], $configCache->get('system', 'test'));
-		$this->assertNotEquals($override['system']['boolTrue'], $configCache->get('system', 'boolTrue'));
+		self::assertConfigValues($data, $configCache);
+		self::assertNotEquals($override['system']['test'], $configCache->get('system', 'test'));
+		self::assertNotEquals($override['system']['boolTrue'], $configCache->get('system', 'boolTrue'));
 	}
 
 	/**
@@ -118,15 +118,15 @@ class CacheTest extends MockedTest
 
 		// empty dataset
 		$configCache->load([]);
-		$this->assertEmpty($configCache->getAll());
+		self::assertEmpty($configCache->getAll());
 
 		// wrong dataset
 		$configCache->load(['system' => 'not_array']);
-		$this->assertEmpty($configCache->getAll());
+		self::assertEmpty($configCache->getAll());
 
 		// incomplete dataset (key is integer ID of the array)
 		$configCache->load(['system' => ['value']]);
-		$this->assertEquals('value', $configCache->get('system', 0));
+		self::assertEquals('value', $configCache->get('system', 0));
 	}
 
 	/**
@@ -140,8 +140,8 @@ class CacheTest extends MockedTest
 
 		$all = $configCache->getAll();
 
-		$this->assertContains($data['system'], $all);
-		$this->assertContains($data['config'], $all);
+		self::assertContains($data['system'], $all);
+		self::assertContains($data['config'], $all);
 	}
 
 	/**
@@ -158,7 +158,7 @@ class CacheTest extends MockedTest
 			}
 		}
 
-		$this->assertConfigValues($data, $configCache);
+		self::assertConfigValues($data, $configCache);
 	}
 
 	/**
@@ -168,7 +168,7 @@ class CacheTest extends MockedTest
 	{
 		$configCache = new Cache();
 
-		$this->assertNull($configCache->get('something', 'value'));
+		self::assertNull($configCache->get('something', 'value'));
 	}
 
 	/**
@@ -186,13 +186,13 @@ class CacheTest extends MockedTest
 			],
 		]);
 
-		$this->assertEquals([
+		self::assertEquals([
 			'key1' => 'value1',
 			'key2' => 'value2',
 		], $configCache->get('system'));
 
 		// explicit null as key
-		$this->assertEquals([
+		self::assertEquals([
 			'key1' => 'value1',
 			'key2' => 'value2',
 		], $configCache->get('system', null));
@@ -212,7 +212,7 @@ class CacheTest extends MockedTest
 			}
 		}
 
-		$this->assertEmpty($configCache->getAll());
+		self::assertEmpty($configCache->getAll());
 	}
 
 	/**
@@ -229,7 +229,7 @@ class CacheTest extends MockedTest
 			]
 		];
 
-		$this->assertEquals($diffConfig, $configCache->keyDiff($diffConfig));
+		self::assertEquals($diffConfig, $configCache->keyDiff($diffConfig));
 	}
 
 	/**
@@ -242,7 +242,7 @@ class CacheTest extends MockedTest
 
 		$diffConfig = $configCache->getAll();
 
-		$this->assertEmpty($configCache->keyDiff($diffConfig));
+		self::assertEmpty($configCache->keyDiff($diffConfig));
 	}
 
 	/**
@@ -257,9 +257,9 @@ class CacheTest extends MockedTest
 			],
 		]);
 
-		$this->assertEquals('supersecure', $configCache->get('database', 'password'));
-		$this->assertNotEquals('supersecure', print_r($configCache->get('database', 'password'), true));
-		$this->assertEquals('notsecured', print_r($configCache->get('database', 'username'), true));
+		self::assertEquals('supersecure', $configCache->get('database', 'password'));
+		self::assertNotEquals('supersecure', print_r($configCache->get('database', 'password'), true));
+		self::assertEquals('notsecured', print_r($configCache->get('database', 'username'), true));
 	}
 
 	/**
@@ -274,9 +274,9 @@ class CacheTest extends MockedTest
 			],
 		], false);
 
-		$this->assertEquals('supersecure', $configCache->get('database', 'password'));
-		$this->assertEquals('supersecure', print_r($configCache->get('database', 'password'), true));
-		$this->assertEquals('notsecured', print_r($configCache->get('database', 'username'), true));
+		self::assertEquals('supersecure', $configCache->get('database', 'password'));
+		self::assertEquals('supersecure', print_r($configCache->get('database', 'password'), true));
+		self::assertEquals('notsecured', print_r($configCache->get('database', 'username'), true));
 	}
 
 	/**
@@ -291,9 +291,9 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertNotEmpty($configCache->get('database', 'password'));
-		$this->assertInstanceOf(HiddenString::class, $configCache->get('database', 'password'));
-		$this->assertEmpty($configCache->get('database', 'username'));
+		self::assertNotEmpty($configCache->get('database', 'password'));
+		self::assertInstanceOf(HiddenString::class, $configCache->get('database', 'password'));
+		self::assertEmpty($configCache->get('database', 'username'));
 	}
 
 	public function testWrongTypePassword()
@@ -305,8 +305,8 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertNotEmpty($configCache->get('database', 'password'));
-		$this->assertEmpty($configCache->get('database', 'username'));
+		self::assertNotEmpty($configCache->get('database', 'password'));
+		self::assertEmpty($configCache->get('database', 'username'));
 
 		$configCache = new Cache([
 			'database' => [
@@ -315,7 +315,7 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertEquals(23, $configCache->get('database', 'password'));
-		$this->assertEmpty($configCache->get('database', 'username'));
+		self::assertEquals(23, $configCache->get('database', 'password'));
+		self::assertEmpty($configCache->get('database', 'username'));
 	}
 }
diff --git a/tests/src/Core/Config/ConfigTest.php b/tests/src/Core/Config/ConfigTest.php
index 48df2b2a4a..59ad3b9690 100644
--- a/tests/src/Core/Config/ConfigTest.php
+++ b/tests/src/Core/Config/ConfigTest.php
@@ -49,9 +49,9 @@ abstract class ConfigTest extends MockedTest
 	{
 		$result = $this->testedConfig->getCache()->getAll();
 
-		$this->assertNotEmpty($result);
-		$this->assertArrayHasKey($cat, $result);
-		$this->assertArraySubset($data, $result[$cat]);
+		self::assertNotEmpty($result);
+		self::assertArrayHasKey($cat, $result);
+		self::assertArraySubset($data, $result[$cat]);
 	}
 
 
@@ -161,10 +161,10 @@ abstract class ConfigTest extends MockedTest
 		                  ->once();
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// assert config is loaded everytime
-		$this->assertConfig('config', $data['config']);
+		self::assertConfig('config', $data['config']);
 	}
 
 	/**
@@ -173,7 +173,7 @@ abstract class ConfigTest extends MockedTest
 	public function testLoad(array $data, array $possibleCats, array $load)
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		foreach ($load as $loadedCats) {
 			$this->testedConfig->load($loadedCats);
@@ -181,7 +181,7 @@ abstract class ConfigTest extends MockedTest
 
 		// Assert at least loaded cats are loaded
 		foreach ($load as $loadedCats) {
-			$this->assertConfig($loadedCats, $data[$loadedCats]);
+			self::assertConfig($loadedCats, $data[$loadedCats]);
 		}
 	}
 
@@ -254,7 +254,7 @@ abstract class ConfigTest extends MockedTest
 	public function testCacheLoadDouble(array $data1, array $data2, array $expect)
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		foreach ($data1 as $cat => $data) {
 			$this->testedConfig->load($cat);
@@ -262,7 +262,7 @@ abstract class ConfigTest extends MockedTest
 
 		// Assert at least loaded cats are loaded
 		foreach ($data1 as $cat => $data) {
-			$this->assertConfig($cat, $data);
+			self::assertConfig($cat, $data);
 		}
 
 		foreach ($data2 as $cat => $data) {
@@ -279,9 +279,9 @@ abstract class ConfigTest extends MockedTest
 		$this->configModel->shouldReceive('load')->withAnyArgs()->andReturn([])->once();
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertEmpty($this->testedConfig->getCache()->getAll());
+		self::assertEmpty($this->testedConfig->getCache()->getAll());
 	}
 
 	/**
@@ -296,12 +296,12 @@ abstract class ConfigTest extends MockedTest
 		                  ->times(3);
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertTrue($this->testedConfig->set('test', 'it', $data));
+		self::assertTrue($this->testedConfig->set('test', 'it', $data));
 
-		$this->assertEquals($data, $this->testedConfig->get('test', 'it'));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
 	}
 
 	/**
@@ -314,12 +314,12 @@ abstract class ConfigTest extends MockedTest
 		$this->configModel->shouldReceive('set')->with('test', 'it', $data)->andReturn(true)->once();
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertTrue($this->testedConfig->set('test', 'it', $data));
+		self::assertTrue($this->testedConfig->set('test', 'it', $data));
 
-		$this->assertEquals($data, $this->testedConfig->get('test', 'it'));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
 	}
 
 	/**
@@ -328,19 +328,19 @@ abstract class ConfigTest extends MockedTest
 	public function testGetWrongWithoutDB()
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// without refresh
-		$this->assertNull($this->testedConfig->get('test', 'it'));
+		self::assertNull($this->testedConfig->get('test', 'it'));
 
 		/// beware that the cache returns '!<unset>!' and not null for a non existing value
-		$this->assertNull($this->testedConfig->getCache()->get('test', 'it'));
+		self::assertNull($this->testedConfig->getCache()->get('test', 'it'));
 
 		// with default value
-		$this->assertEquals('default', $this->testedConfig->get('test', 'it', 'default'));
+		self::assertEquals('default', $this->testedConfig->get('test', 'it', 'default'));
 
 		// with default value and refresh
-		$this->assertEquals('default', $this->testedConfig->get('test', 'it', 'default', true));
+		self::assertEquals('default', $this->testedConfig->get('test', 'it', 'default', true));
 	}
 
 	/**
@@ -353,19 +353,19 @@ abstract class ConfigTest extends MockedTest
 		$this->configCache->load(['test' => ['it' => 'now']], Cache::SOURCE_FILE);
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// without refresh
-		$this->assertEquals('now', $this->testedConfig->get('test', 'it'));
-		$this->assertEquals('now', $this->testedConfig->getCache()->get('test', 'it'));
+		self::assertEquals('now', $this->testedConfig->get('test', 'it'));
+		self::assertEquals('now', $this->testedConfig->getCache()->get('test', 'it'));
 
 		// with refresh
-		$this->assertEquals($data, $this->testedConfig->get('test', 'it', null, true));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get('test', 'it', null, true));
+		self::assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
 
 		// without refresh and wrong value and default
-		$this->assertEquals('default', $this->testedConfig->get('test', 'not', 'default'));
-		$this->assertNull($this->testedConfig->getCache()->get('test', 'not'));
+		self::assertEquals('default', $this->testedConfig->get('test', 'not', 'default'));
+		self::assertNull($this->testedConfig->getCache()->get('test', 'not'));
 	}
 
 	/**
@@ -378,16 +378,16 @@ abstract class ConfigTest extends MockedTest
 		$this->configCache->load(['test' => ['it' => $data]], Cache::SOURCE_FILE);
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertEquals($data, $this->testedConfig->get('test', 'it'));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get('test', 'it'));
+		self::assertEquals($data, $this->testedConfig->getCache()->get('test', 'it'));
 
-		$this->assertTrue($this->testedConfig->delete('test', 'it'));
-		$this->assertNull($this->testedConfig->get('test', 'it'));
-		$this->assertNull($this->testedConfig->getCache()->get('test', 'it'));
+		self::assertTrue($this->testedConfig->delete('test', 'it'));
+		self::assertNull($this->testedConfig->get('test', 'it'));
+		self::assertNull($this->testedConfig->getCache()->get('test', 'it'));
 
-		$this->assertEmpty($this->testedConfig->getCache()->getAll());
+		self::assertEmpty($this->testedConfig->getCache()->getAll());
 	}
 
 	/**
@@ -415,23 +415,23 @@ abstract class ConfigTest extends MockedTest
 		                  ->once();
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// directly set the value to the cache
 		$this->testedConfig->getCache()->set('test', 'it', 'now');
 
-		$this->assertEquals('now', $this->testedConfig->get('test', 'it'));
-		$this->assertEquals('now', $this->testedConfig->getCache()->get('test', 'it'));
+		self::assertEquals('now', $this->testedConfig->get('test', 'it'));
+		self::assertEquals('now', $this->testedConfig->getCache()->get('test', 'it'));
 
 		// delete from cache only
-		$this->assertTrue($this->testedConfig->delete('test', 'it'));
+		self::assertTrue($this->testedConfig->delete('test', 'it'));
 		// delete from db only
-		$this->assertTrue($this->testedConfig->delete('test', 'second'));
+		self::assertTrue($this->testedConfig->delete('test', 'second'));
 		// no delete
-		$this->assertFalse($this->testedConfig->delete('test', 'third'));
+		self::assertFalse($this->testedConfig->delete('test', 'third'));
 		// delete both
-		$this->assertTrue($this->testedConfig->delete('test', 'quarter'));
+		self::assertTrue($this->testedConfig->delete('test', 'quarter'));
 
-		$this->assertEmpty($this->testedConfig->getCache()->getAll());
+		self::assertEmpty($this->testedConfig->getCache()->getAll());
 	}
 }
diff --git a/tests/src/Core/Config/JitConfigTest.php b/tests/src/Core/Config/JitConfigTest.php
index cdaf874b65..df0ea4f308 100644
--- a/tests/src/Core/Config/JitConfigTest.php
+++ b/tests/src/Core/Config/JitConfigTest.php
@@ -100,7 +100,7 @@ class JitConfigTest extends ConfigTest
 
 		// Assert the expected categories
 		foreach ($data2 as $cat => $data) {
-			$this->assertConfig($cat, $expect[$cat]);
+			self::assertConfig($cat, $expect[$cat]);
 		}
 	}
 
diff --git a/tests/src/Core/Config/PreloadConfigTest.php b/tests/src/Core/Config/PreloadConfigTest.php
index 4bcf842d80..386f093023 100644
--- a/tests/src/Core/Config/PreloadConfigTest.php
+++ b/tests/src/Core/Config/PreloadConfigTest.php
@@ -59,7 +59,7 @@ class PreloadConfigTest extends ConfigTest
 
 		// Assert that every category is loaded everytime
 		foreach ($data as $cat => $values) {
-			$this->assertConfig($cat, $values);
+			self::assertConfig($cat, $values);
 		}
 	}
 
@@ -80,7 +80,7 @@ class PreloadConfigTest extends ConfigTest
 
 		// Assert that every category is loaded everytime and is NOT overwritten
 		foreach ($data1 as $cat => $values) {
-			$this->assertConfig($cat, $values);
+			self::assertConfig($cat, $values);
 		}
 	}
 
diff --git a/tests/src/Core/InstallerTest.php b/tests/src/Core/InstallerTest.php
index 00879680ee..68af5ff37f 100644
--- a/tests/src/Core/InstallerTest.php
+++ b/tests/src/Core/InstallerTest.php
@@ -104,7 +104,7 @@ class InstallerTest extends MockedTest
 			'help' => $help]
 		];
 
-		$this->assertArraySubset($subSet, $assertionArray, false, "expected subset: " . PHP_EOL . print_r($subSet, true) . PHP_EOL . "current subset: " . print_r($assertionArray, true));
+		self::assertArraySubset($subSet, $assertionArray, false, "expected subset: " . PHP_EOL . print_r($subSet, true) . PHP_EOL . "current subset: " . print_r($assertionArray, true));
 	}
 
 	/**
@@ -152,11 +152,11 @@ class InstallerTest extends MockedTest
 
 		$this->setFunctions(['openssl_pkey_new' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkKeys());
+		self::assertFalse($install->checkKeys());
 
 		$this->setFunctions(['openssl_pkey_new' => true]);
 		$install = new Installer();
-		$this->assertTrue($install->checkKeys());
+		self::assertTrue($install->checkKeys());
 	}
 
 	/**
@@ -167,8 +167,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['curl_init' => false, 'imagecreatefromjpeg' => true]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(3,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(3,
 			'libCurl PHP module',
 			'Error: libCURL PHP module required but not installed.',
 			false,
@@ -178,8 +178,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['imagecreatefromjpeg' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(4,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(4,
 			'GD graphics PHP module',
 			'Error: GD graphics PHP module with JPEG support required but not installed.',
 			false,
@@ -189,8 +189,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['openssl_public_encrypt' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(5,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(5,
 			'OpenSSL PHP module',
 			'Error: openssl PHP module required but not installed.',
 			false,
@@ -200,8 +200,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['mb_strlen' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(6,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(6,
 			'mb_string PHP module',
 			'Error: mb_string PHP module required but not installed.',
 			false,
@@ -211,8 +211,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['iconv_strlen' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(7,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(7,
 			'iconv PHP module',
 			'Error: iconv PHP module required but not installed.',
 			false,
@@ -222,8 +222,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['posix_kill' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(8,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(8,
 			'POSIX PHP module',
 			'Error: POSIX PHP module required but not installed.',
 			false,
@@ -233,8 +233,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['json_encode' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(9,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(9,
 			'JSON PHP module',
 			'Error: JSON PHP module required but not installed.',
 			false,
@@ -244,8 +244,8 @@ class InstallerTest extends MockedTest
 		$this->mockFunctionL10TCalls();
 		$this->setFunctions(['finfo_open' => false]);
 		$install = new Installer();
-		$this->assertFalse($install->checkFunctions());
-		$this->assertCheckExist(10,
+		self::assertFalse($install->checkFunctions());
+		self::assertCheckExist(10,
 			'File Information PHP module',
 			'Error: File Information PHP module required but not installed.',
 			false,
@@ -264,7 +264,7 @@ class InstallerTest extends MockedTest
 			'finfo_open' => true,
 		]);
 		$install = new Installer();
-		$this->assertTrue($install->checkFunctions());
+		self::assertTrue($install->checkFunctions());
 	}
 
 	/**
@@ -274,17 +274,17 @@ class InstallerTest extends MockedTest
 	{
 		$this->l10nMock->shouldReceive('t')->andReturnUsing(function ($args) { return $args; });
 
-		$this->assertTrue($this->root->hasChild('config/local.config.php'));
+		self::assertTrue($this->root->hasChild('config/local.config.php'));
 
 		$install = new Installer();
-		$this->assertTrue($install->checkLocalIni());
+		self::assertTrue($install->checkLocalIni());
 
 		$this->delConfigFile('local.config.php');
 
-		$this->assertFalse($this->root->hasChild('config/local.config.php'));
+		self::assertFalse($this->root->hasChild('config/local.config.php'));
 
 		$install = new Installer();
-		$this->assertTrue($install->checkLocalIni());
+		self::assertTrue($install->checkLocalIni());
 	}
 
 	/**
@@ -330,8 +330,8 @@ class InstallerTest extends MockedTest
 
 		$install = new Installer();
 
-		$this->assertFalse($install->checkHtAccess('https://test'));
-		$this->assertSame('test Error', $install->getChecks()[0]['error_msg']['msg']);
+		self::assertFalse($install->checkHtAccess('https://test'));
+		self::assertSame('test Error', $install->getChecks()[0]['error_msg']['msg']);
 	}
 
 	/**
@@ -377,7 +377,7 @@ class InstallerTest extends MockedTest
 
 		$install = new Installer();
 
-		$this->assertTrue($install->checkHtAccess('https://test'));
+		self::assertTrue($install->checkHtAccess('https://test'));
 	}
 
 	/**
@@ -396,9 +396,9 @@ class InstallerTest extends MockedTest
 		$install = new Installer();
 
 		// even there is no supported type, Imagick should return true (because it is not required)
-		$this->assertTrue($install->checkImagick());
+		self::assertTrue($install->checkImagick());
 
-		$this->assertCheckExist(1,
+		self::assertCheckExist(1,
 			$this->l10nMock->t('ImageMagick supports GIF'),
 			'',
 			true,
@@ -422,8 +422,8 @@ class InstallerTest extends MockedTest
 		$install = new Installer();
 
 		// even there is no supported type, Imagick should return true (because it is not required)
-		$this->assertTrue($install->checkImagick());
-		$this->assertCheckExist(1,
+		self::assertTrue($install->checkImagick());
+		self::assertCheckExist(1,
 			$this->l10nMock->t('ImageMagick supports GIF'),
 			'',
 			false,
@@ -439,8 +439,8 @@ class InstallerTest extends MockedTest
 		$install = new Installer();
 
 		// even there is no supported type, Imagick should return true (because it is not required)
-		$this->assertTrue($install->checkImagick());
-		$this->assertCheckExist(0,
+		self::assertTrue($install->checkImagick());
+		self::assertCheckExist(0,
 			'ImageMagick PHP extension is not installed',
 			'',
 			false,
diff --git a/tests/src/Core/L10nTest.php b/tests/src/Core/L10nTest.php
index 003ff0f8ac..f58c4cd4dd 100644
--- a/tests/src/Core/L10nTest.php
+++ b/tests/src/Core/L10nTest.php
@@ -109,6 +109,6 @@ class L10nTest extends MockedTest
 	 */
 	public function testDetectLanguage(array $server, array $get, string $default, string $assert)
 	{
-		$this->assertEquals($assert, L10n::detectLanguage($server, $get, $default));
+		self::assertEquals($assert, L10n::detectLanguage($server, $get, $default));
 	}
 }
diff --git a/tests/src/Core/Lock/LockTest.php b/tests/src/Core/Lock/LockTest.php
index c7a1664f11..ea668d83bb 100644
--- a/tests/src/Core/Lock/LockTest.php
+++ b/tests/src/Core/Lock/LockTest.php
@@ -56,10 +56,10 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testLock()
 	{
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->isLocked('foo'));
-		$this->assertFalse($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('bar'));
 	}
 
 	/**
@@ -67,11 +67,11 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testDoubleLock()
 	{
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->isLocked('foo'));
 		// We already locked it
-		$this->assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->acquire('foo', 1));
 	}
 
 	/**
@@ -79,11 +79,11 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testReleaseLock()
 	{
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->isLocked('foo'));
 		$this->instance->release('foo');
-		$this->assertFalse($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('foo'));
 	}
 
 	/**
@@ -91,19 +91,19 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testReleaseAll()
 	{
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->acquire('bar', 1));
-		$this->assertTrue($this->instance->acquire('nice', 1));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->acquire('bar', 1));
+		self::assertTrue($this->instance->acquire('nice', 1));
 
-		$this->assertTrue($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->isLocked('bar'));
-		$this->assertTrue($this->instance->isLocked('nice'));
+		self::assertTrue($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->isLocked('bar'));
+		self::assertTrue($this->instance->isLocked('nice'));
 
-		$this->assertTrue($this->instance->releaseAll());
+		self::assertTrue($this->instance->releaseAll());
 
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertFalse($this->instance->isLocked('bar'));
-		$this->assertFalse($this->instance->isLocked('nice'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('nice'));
 	}
 
 	/**
@@ -111,23 +111,23 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testReleaseAfterUnlock()
 	{
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertFalse($this->instance->isLocked('bar'));
-		$this->assertFalse($this->instance->isLocked('nice'));
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->acquire('bar', 1));
-		$this->assertTrue($this->instance->acquire('nice', 1));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('nice'));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->acquire('bar', 1));
+		self::assertTrue($this->instance->acquire('nice', 1));
 
-		$this->assertTrue($this->instance->release('foo'));
+		self::assertTrue($this->instance->release('foo'));
 
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->isLocked('bar'));
-		$this->assertTrue($this->instance->isLocked('nice'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->isLocked('bar'));
+		self::assertTrue($this->instance->isLocked('nice'));
 
-		$this->assertTrue($this->instance->releaseAll());
+		self::assertTrue($this->instance->releaseAll());
 
-		$this->assertFalse($this->instance->isLocked('bar'));
-		$this->assertFalse($this->instance->isLocked('nice'));
+		self::assertFalse($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('nice'));
 	}
 
 	/**
@@ -135,11 +135,11 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testReleaseWitTTL()
 	{
-		$this->assertFalse($this->instance->isLocked('test'));
-		$this->assertTrue($this->instance->acquire('test', 1, 10));
-		$this->assertTrue($this->instance->isLocked('test'));
-		$this->assertTrue($this->instance->release('test'));
-		$this->assertFalse($this->instance->isLocked('test'));
+		self::assertFalse($this->instance->isLocked('test'));
+		self::assertTrue($this->instance->acquire('test', 1, 10));
+		self::assertTrue($this->instance->isLocked('test'));
+		self::assertTrue($this->instance->release('test'));
+		self::assertFalse($this->instance->isLocked('test'));
 	}
 
 	/**
@@ -147,19 +147,19 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testGetLocks()
 	{
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->acquire('bar', 1));
-		$this->assertTrue($this->instance->acquire('nice', 1));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->acquire('bar', 1));
+		self::assertTrue($this->instance->acquire('nice', 1));
 
-		$this->assertTrue($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->isLocked('bar'));
-		$this->assertTrue($this->instance->isLocked('nice'));
+		self::assertTrue($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->isLocked('bar'));
+		self::assertTrue($this->instance->isLocked('nice'));
 
 		$locks = $this->instance->getLocks();
 
-		$this->assertContains('foo', $locks);
-		$this->assertContains('bar', $locks);
-		$this->assertContains('nice', $locks);
+		self::assertContains('foo', $locks);
+		self::assertContains('bar', $locks);
+		self::assertContains('nice', $locks);
 	}
 
 	/**
@@ -167,19 +167,19 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testGetLocksWithPrefix()
 	{
-		$this->assertTrue($this->instance->acquire('foo', 1));
-		$this->assertTrue($this->instance->acquire('test1', 1));
-		$this->assertTrue($this->instance->acquire('test2', 1));
+		self::assertTrue($this->instance->acquire('foo', 1));
+		self::assertTrue($this->instance->acquire('test1', 1));
+		self::assertTrue($this->instance->acquire('test2', 1));
 
-		$this->assertTrue($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->isLocked('test1'));
-		$this->assertTrue($this->instance->isLocked('test2'));
+		self::assertTrue($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->isLocked('test1'));
+		self::assertTrue($this->instance->isLocked('test2'));
 
 		$locks = $this->instance->getLocks('test');
 
-		$this->assertContains('test1', $locks);
-		$this->assertContains('test2', $locks);
-		$this->assertNotContains('foo', $locks);
+		self::assertContains('test1', $locks);
+		self::assertContains('test2', $locks);
+		self::assertNotContains('foo', $locks);
 	}
 
 	/**
@@ -189,25 +189,25 @@ abstract class LockTest extends MockedTest
 	{
 		$this->markTestSkipped('taking too much time without mocking');
 
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertFalse($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('bar'));
 
 		// TODO [nupplaphil] - Because of the Datetime-Utils for the database, we have to wait a FULL second between the checks to invalidate the db-locks/cache
-		$this->assertTrue($this->instance->acquire('foo', 2, 1));
-		$this->assertTrue($this->instance->acquire('bar', 2, 3));
+		self::assertTrue($this->instance->acquire('foo', 2, 1));
+		self::assertTrue($this->instance->acquire('bar', 2, 3));
 
-		$this->assertTrue($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->isLocked('bar'));
+		self::assertTrue($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->isLocked('bar'));
 
 		sleep(2);
 
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertTrue($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertTrue($this->instance->isLocked('bar'));
 
 		sleep(2);
 
-		$this->assertFalse($this->instance->isLocked('foo'));
-		$this->assertFalse($this->instance->isLocked('bar'));
+		self::assertFalse($this->instance->isLocked('foo'));
+		self::assertFalse($this->instance->isLocked('bar'));
 	}
 
 	/**
@@ -215,7 +215,7 @@ abstract class LockTest extends MockedTest
 	 */
 	public function testReleaseLockWithoutLock()
 	{
-		$this->assertFalse($this->instance->isLocked('wrongLock'));
-		$this->assertFalse($this->instance->release('wrongLock'));
+		self::assertFalse($this->instance->isLocked('wrongLock'));
+		self::assertFalse($this->instance->release('wrongLock'));
 	}
 }
diff --git a/tests/src/Core/Lock/SemaphoreLockTest.php b/tests/src/Core/Lock/SemaphoreLockTest.php
index 04aeb2b45d..fd60f32c71 100644
--- a/tests/src/Core/Lock/SemaphoreLockTest.php
+++ b/tests/src/Core/Lock/SemaphoreLockTest.php
@@ -73,9 +73,9 @@ class SemaphoreLockTest extends LockTest
 		$file = get_temppath() . '/test.sem';
 		touch($file);
 
-		$this->assertTrue(file_exists($file));
-		$this->assertFalse($this->instance->release('test', false));
-		$this->assertTrue(file_exists($file));
+		self::assertTrue(file_exists($file));
+		self::assertFalse($this->instance->release('test', false));
+		self::assertTrue(file_exists($file));
 	}
 
 	/**
@@ -90,9 +90,9 @@ class SemaphoreLockTest extends LockTest
 		$file = get_temppath() . '/test.sem';
 		touch($file);
 
-		$this->assertTrue(file_exists($file));
-		$this->assertFalse($this->instance->release('test', true));
-		$this->assertTrue(file_exists($file));
+		self::assertTrue(file_exists($file));
+		self::assertFalse($this->instance->release('test', true));
+		self::assertTrue(file_exists($file));
 	}
 
 	/**
@@ -103,9 +103,9 @@ class SemaphoreLockTest extends LockTest
 		$file = get_temppath() . '/test.sem';
 		touch($file);
 
-		$this->assertTrue(file_exists($file));
-		$this->assertTrue($this->instance->acquire('test'));
-		$this->assertTrue($this->instance->isLocked('test'));
-		$this->assertTrue($this->instance->release('test'));
+		self::assertTrue(file_exists($file));
+		self::assertTrue($this->instance->acquire('test'));
+		self::assertTrue($this->instance->isLocked('test'));
+		self::assertTrue($this->instance->release('test'));
 	}
 }
diff --git a/tests/src/Core/PConfig/CacheTest.php b/tests/src/Core/PConfig/CacheTest.php
index 927fab009c..bc5aa6934f 100644
--- a/tests/src/Core/PConfig/CacheTest.php
+++ b/tests/src/Core/PConfig/CacheTest.php
@@ -51,7 +51,7 @@ class CacheTest extends MockedTest
 	{
 		foreach ($data as $cat => $values) {
 			foreach ($values as $key => $value) {
-				$this->assertEquals($data[$cat][$key], $configCache->get($uid, $cat, $key));
+				self::assertEquals($data[$cat][$key], $configCache->get($uid, $cat, $key));
 			}
 		}
 	}
@@ -72,7 +72,7 @@ class CacheTest extends MockedTest
 			}
 		}
 
-		$this->assertConfigValues($data, $configCache, $uid);
+		self::assertConfigValues($data, $configCache, $uid);
 	}
 
 
@@ -94,13 +94,13 @@ class CacheTest extends MockedTest
 			],
 		]);
 
-		$this->assertEquals([
+		self::assertEquals([
 			'key1' => 'value1',
 			'key2' => 'value2',
 		], $configCache->get($uid, 'system'));
 
 		// test explicit cat with null as key
-		$this->assertEquals([
+		self::assertEquals([
 			'key1' => 'value1',
 			'key2' => 'value2',
 		], $configCache->get($uid, 'system', null));
@@ -128,7 +128,7 @@ class CacheTest extends MockedTest
 			}
 		}
 
-		$this->assertEmpty($configCache->getAll());
+		self::assertEmpty($configCache->getAll());
 	}
 
 	/**
@@ -146,7 +146,7 @@ class CacheTest extends MockedTest
 			]
 		];
 
-		$this->assertEquals($diffConfig, $configCache->keyDiff($diffConfig));
+		self::assertEquals($diffConfig, $configCache->keyDiff($diffConfig));
 	}
 
 	/**
@@ -162,7 +162,7 @@ class CacheTest extends MockedTest
 
 		$diffConfig = $configCache->getAll();
 
-		$this->assertEmpty($configCache->keyDiff($diffConfig));
+		self::assertEmpty($configCache->keyDiff($diffConfig));
 	}
 
 	/**
@@ -179,9 +179,9 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertEquals('supersecure', $configCache->get(1, 'database', 'password'));
-		$this->assertNotEquals('supersecure', print_r($configCache->get(1, 'database', 'password'), true));
-		$this->assertEquals('notsecured', print_r($configCache->get(1, 'database', 'username'), true));
+		self::assertEquals('supersecure', $configCache->get(1, 'database', 'password'));
+		self::assertNotEquals('supersecure', print_r($configCache->get(1, 'database', 'password'), true));
+		self::assertEquals('notsecured', print_r($configCache->get(1, 'database', 'username'), true));
 	}
 
 	/**
@@ -198,9 +198,9 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertEquals('supersecure', $configCache->get(1, 'database', 'password'));
-		$this->assertEquals('supersecure', print_r($configCache->get(1, 'database', 'password'), true));
-		$this->assertEquals('notsecured', print_r($configCache->get(1, 'database', 'username'), true));
+		self::assertEquals('supersecure', $configCache->get(1, 'database', 'password'));
+		self::assertEquals('supersecure', print_r($configCache->get(1, 'database', 'password'), true));
+		self::assertEquals('notsecured', print_r($configCache->get(1, 'database', 'username'), true));
 	}
 
 	/**
@@ -217,8 +217,8 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertEmpty($configCache->get(1, 'database', 'password'));
-		$this->assertEmpty($configCache->get(1, 'database', 'username'));
+		self::assertEmpty($configCache->get(1, 'database', 'password'));
+		self::assertEmpty($configCache->get(1, 'database', 'username'));
 	}
 
 	public function testWrongTypePassword()
@@ -232,8 +232,8 @@ class CacheTest extends MockedTest
 			]
 		]);
 
-		$this->assertNotEmpty($configCache->get(1, 'database', 'password'));
-		$this->assertEmpty($configCache->get(1, 'database', 'username'));
+		self::assertNotEmpty($configCache->get(1, 'database', 'password'));
+		self::assertEmpty($configCache->get(1, 'database', 'username'));
 
 		$configCache = new Cache();
 
@@ -244,8 +244,8 @@ class CacheTest extends MockedTest
 			],
 		]);
 
-		$this->assertEquals(23, $configCache->get(1, 'database', 'password'));
-		$this->assertEmpty($configCache->get(1, 'database', 'username'));
+		self::assertEquals(23, $configCache->get(1, 'database', 'password'));
+		self::assertEmpty($configCache->get(1, 'database', 'username'));
 	}
 
 	/**
@@ -268,11 +268,11 @@ class CacheTest extends MockedTest
 			],
 		]);
 
-		$this->assertEquals('value1', $configCache->get(1, 'cat1', 'key1'));
-		$this->assertEquals('value2', $configCache->get(2, 'cat2', 'key2'));
+		self::assertEquals('value1', $configCache->get(1, 'cat1', 'key1'));
+		self::assertEquals('value2', $configCache->get(2, 'cat2', 'key2'));
 
-		$this->assertNull($configCache->get(1, 'cat2', 'key2'));
-		$this->assertNull($configCache->get(2, 'cat1', 'key1'));
+		self::assertNull($configCache->get(1, 'cat2', 'key2'));
+		self::assertNull($configCache->get(2, 'cat1', 'key1'));
 	}
 
 	/**
@@ -286,9 +286,9 @@ class CacheTest extends MockedTest
 
 		$configCache = new Cache();
 
-		$this->assertNull($configCache->get($uid, 'cat1', 'cat2'));
+		self::assertNull($configCache->get($uid, 'cat1', 'cat2'));
 
-		$this->assertFalse($configCache->set($uid, 'cat1', 'key1', 'doesn\'t matter!'));
-		$this->assertFalse($configCache->delete($uid, 'cat1', 'key1'));
+		self::assertFalse($configCache->set($uid, 'cat1', 'key1', 'doesn\'t matter!'));
+		self::assertFalse($configCache->delete($uid, 'cat1', 'key1'));
 	}
 }
diff --git a/tests/src/Core/PConfig/JitPConfigTest.php b/tests/src/Core/PConfig/JitPConfigTest.php
index ab5dbafd91..b8df468298 100644
--- a/tests/src/Core/PConfig/JitPConfigTest.php
+++ b/tests/src/Core/PConfig/JitPConfigTest.php
@@ -78,7 +78,7 @@ class JitPConfigTest extends PConfigTest
 
 		// Assert the expected categories
 		foreach ($data2 as $cat => $data) {
-			$this->assertConfig($uid, $cat, $expect[$cat]);
+			self::assertConfig($uid, $cat, $expect[$cat]);
 		}
 	}
 
diff --git a/tests/src/Core/PConfig/PConfigTest.php b/tests/src/Core/PConfig/PConfigTest.php
index 090dab69f5..4bc5edb418 100644
--- a/tests/src/Core/PConfig/PConfigTest.php
+++ b/tests/src/Core/PConfig/PConfigTest.php
@@ -50,10 +50,10 @@ abstract class PConfigTest extends MockedTest
 	{
 		$result = $this->testedConfig->getCache()->getAll();
 
-		$this->assertNotEmpty($result);
-		$this->assertArrayHasKey($uid, $result);
-		$this->assertArrayHasKey($cat, $result[$uid]);
-		$this->assertArraySubset($data, $result[$uid][$cat]);
+		self::assertNotEmpty($result);
+		self::assertArrayHasKey($uid, $result);
+		self::assertArrayHasKey($cat, $result[$uid]);
+		self::assertArraySubset($data, $result[$uid][$cat]);
 	}
 
 
@@ -164,9 +164,9 @@ abstract class PConfigTest extends MockedTest
 	public function testSetUp(int $uid, array $data)
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertEmpty($this->testedConfig->getCache()->getAll());
+		self::assertEmpty($this->testedConfig->getCache()->getAll());
 	}
 
 	/**
@@ -175,7 +175,7 @@ abstract class PConfigTest extends MockedTest
 	public function testLoad(int $uid, array $data, array $possibleCats, array $load)
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		foreach ($load as $loadedCats) {
 			$this->testedConfig->load($uid, $loadedCats);
@@ -183,7 +183,7 @@ abstract class PConfigTest extends MockedTest
 
 		// Assert at least loaded cats are loaded
 		foreach ($load as $loadedCats) {
-			$this->assertConfig($uid, $loadedCats, $data[$loadedCats]);
+			self::assertConfig($uid, $loadedCats, $data[$loadedCats]);
 		}
 	}
 
@@ -258,7 +258,7 @@ abstract class PConfigTest extends MockedTest
 	public function testCacheLoadDouble(int $uid, array $data1, array $data2, array $expect)
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		foreach ($data1 as $cat => $data) {
 			$this->testedConfig->load($uid, $cat);
@@ -266,7 +266,7 @@ abstract class PConfigTest extends MockedTest
 
 		// Assert at least loaded cats are loaded
 		foreach ($data1 as $cat => $data) {
-			$this->assertConfig($uid, $cat, $data);
+			self::assertConfig($uid, $cat, $data);
 		}
 
 		foreach ($data2 as $cat => $data) {
@@ -282,12 +282,12 @@ abstract class PConfigTest extends MockedTest
 	public function testSetGetWithoutDB(int $uid, $data)
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertTrue($this->testedConfig->set($uid, 'test', 'it', $data));
+		self::assertTrue($this->testedConfig->set($uid, 'test', 'it', $data));
 
-		$this->assertEquals($data, $this->testedConfig->get($uid, 'test', 'it'));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
 	}
 
 	/**
@@ -303,12 +303,12 @@ abstract class PConfigTest extends MockedTest
 		                  ->once();
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertTrue($this->testedConfig->set($uid, 'test', 'it', $data));
+		self::assertTrue($this->testedConfig->set($uid, 'test', 'it', $data));
 
-		$this->assertEquals($data, $this->testedConfig->get($uid, 'test', 'it'));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
 	}
 
 	/**
@@ -317,19 +317,19 @@ abstract class PConfigTest extends MockedTest
 	public function testGetWrongWithoutDB()
 	{
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// without refresh
-		$this->assertNull($this->testedConfig->get(0, 'test', 'it'));
+		self::assertNull($this->testedConfig->get(0, 'test', 'it'));
 
 		/// beware that the cache returns '!<unset>!' and not null for a non existing value
-		$this->assertNull($this->testedConfig->getCache()->get(0, 'test', 'it'));
+		self::assertNull($this->testedConfig->getCache()->get(0, 'test', 'it'));
 
 		// with default value
-		$this->assertEquals('default', $this->testedConfig->get(0, 'test', 'it', 'default'));
+		self::assertEquals('default', $this->testedConfig->get(0, 'test', 'it', 'default'));
 
 		// with default value and refresh
-		$this->assertEquals('default', $this->testedConfig->get(0, 'test', 'it', 'default', true));
+		self::assertEquals('default', $this->testedConfig->get(0, 'test', 'it', 'default', true));
 	}
 
 	/**
@@ -342,19 +342,19 @@ abstract class PConfigTest extends MockedTest
 		$this->configCache->load($uid, ['test' => ['it' => 'now']]);
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// without refresh
-		$this->assertEquals('now', $this->testedConfig->get($uid, 'test', 'it'));
-		$this->assertEquals('now', $this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertEquals('now', $this->testedConfig->get($uid, 'test', 'it'));
+		self::assertEquals('now', $this->testedConfig->getCache()->get($uid, 'test', 'it'));
 
 		// with refresh
-		$this->assertEquals($data, $this->testedConfig->get($uid, 'test', 'it', null, true));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get($uid, 'test', 'it', null, true));
+		self::assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
 
 		// without refresh and wrong value and default
-		$this->assertEquals('default', $this->testedConfig->get($uid, 'test', 'not', 'default'));
-		$this->assertNull($this->testedConfig->getCache()->get($uid, 'test', 'not'));
+		self::assertEquals('default', $this->testedConfig->get($uid, 'test', 'not', 'default'));
+		self::assertNull($this->testedConfig->getCache()->get($uid, 'test', 'not'));
 	}
 
 	/**
@@ -367,16 +367,16 @@ abstract class PConfigTest extends MockedTest
 		$this->configCache->load($uid, ['test' => ['it' => $data]]);
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertEquals($data, $this->testedConfig->get($uid, 'test', 'it'));
-		$this->assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->get($uid, 'test', 'it'));
+		self::assertEquals($data, $this->testedConfig->getCache()->get($uid, 'test', 'it'));
 
-		$this->assertTrue($this->testedConfig->delete($uid, 'test', 'it'));
-		$this->assertNull($this->testedConfig->get($uid, 'test', 'it'));
-		$this->assertNull($this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertTrue($this->testedConfig->delete($uid, 'test', 'it'));
+		self::assertNull($this->testedConfig->get($uid, 'test', 'it'));
+		self::assertNull($this->testedConfig->getCache()->get($uid, 'test', 'it'));
 
-		$this->assertEmpty($this->testedConfig->getCache()->getAll());
+		self::assertEmpty($this->testedConfig->getCache()->getAll());
 	}
 
 	/**
@@ -406,24 +406,24 @@ abstract class PConfigTest extends MockedTest
 		                  ->once();
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
 		// directly set the value to the cache
 		$this->testedConfig->getCache()->set($uid, 'test', 'it', 'now');
 
-		$this->assertEquals('now', $this->testedConfig->get($uid, 'test', 'it'));
-		$this->assertEquals('now', $this->testedConfig->getCache()->get($uid, 'test', 'it'));
+		self::assertEquals('now', $this->testedConfig->get($uid, 'test', 'it'));
+		self::assertEquals('now', $this->testedConfig->getCache()->get($uid, 'test', 'it'));
 
 		// delete from cache only
-		$this->assertTrue($this->testedConfig->delete($uid, 'test', 'it'));
+		self::assertTrue($this->testedConfig->delete($uid, 'test', 'it'));
 		// delete from db only
-		$this->assertTrue($this->testedConfig->delete($uid, 'test', 'second'));
+		self::assertTrue($this->testedConfig->delete($uid, 'test', 'second'));
 		// no delete
-		$this->assertFalse($this->testedConfig->delete($uid, 'test', 'third'));
+		self::assertFalse($this->testedConfig->delete($uid, 'test', 'third'));
 		// delete both
-		$this->assertTrue($this->testedConfig->delete($uid, 'test', 'quarter'));
+		self::assertTrue($this->testedConfig->delete($uid, 'test', 'quarter'));
 
-		$this->assertEmpty($this->testedConfig->getCache()->getAll());
+		self::assertEmpty($this->testedConfig->getCache()->getAll());
 	}
 
 	public function dataMultiUid()
@@ -466,12 +466,12 @@ abstract class PConfigTest extends MockedTest
 		$this->configCache->load($data2['uid'], $data2['data']);
 
 		$this->testedConfig = $this->getInstance();
-		$this->assertInstanceOf(Cache::class, $this->testedConfig->getCache());
+		self::assertInstanceOf(Cache::class, $this->testedConfig->getCache());
 
-		$this->assertConfig($data1['uid'], 'cat1', $data1['data']['cat1']);
-		$this->assertConfig($data1['uid'], 'cat2', $data1['data']['cat2']);
-		$this->assertConfig($data2['uid'], 'cat1', $data2['data']['cat1']);
-		$this->assertConfig($data2['uid'], 'cat2', $data2['data']['cat2']);
+		self::assertConfig($data1['uid'], 'cat1', $data1['data']['cat1']);
+		self::assertConfig($data1['uid'], 'cat2', $data1['data']['cat2']);
+		self::assertConfig($data2['uid'], 'cat1', $data2['data']['cat1']);
+		self::assertConfig($data2['uid'], 'cat2', $data2['data']['cat2']);
 	}
 
 	/**
@@ -485,10 +485,10 @@ abstract class PConfigTest extends MockedTest
 
 		$this->testedConfig = $this->getInstance();
 
-		$this->assertNull($this->testedConfig->get($uid, 'cat1', 'cat2'));
-		$this->assertEquals('fallback!', $this->testedConfig->get($uid, 'cat1', 'cat2', 'fallback!'));
+		self::assertNull($this->testedConfig->get($uid, 'cat1', 'cat2'));
+		self::assertEquals('fallback!', $this->testedConfig->get($uid, 'cat1', 'cat2', 'fallback!'));
 
-		$this->assertFalse($this->testedConfig->set($uid, 'cat1', 'key1', 'doesn\'t matter!'));
-		$this->assertFalse($this->testedConfig->delete($uid, 'cat1', 'key1'));
+		self::assertFalse($this->testedConfig->set($uid, 'cat1', 'key1', 'doesn\'t matter!'));
+		self::assertFalse($this->testedConfig->delete($uid, 'cat1', 'key1'));
 	}
 }
diff --git a/tests/src/Core/PConfig/PreloadPConfigTest.php b/tests/src/Core/PConfig/PreloadPConfigTest.php
index 984d2c0e26..413a6c9970 100644
--- a/tests/src/Core/PConfig/PreloadPConfigTest.php
+++ b/tests/src/Core/PConfig/PreloadPConfigTest.php
@@ -49,7 +49,7 @@ class PreloadPConfigTest extends PConfigTest
 
 		// Assert that every category is loaded everytime
 		foreach ($data as $cat => $values) {
-			$this->assertConfig($uid, $cat, $values);
+			self::assertConfig($uid, $cat, $values);
 		}
 	}
 
@@ -71,7 +71,7 @@ class PreloadPConfigTest extends PConfigTest
 
 		// Assert that every category is loaded everytime and is NOT overwritten
 		foreach ($data1 as $cat => $values) {
-			$this->assertConfig($uid, $cat, $values);
+			self::assertConfig($uid, $cat, $values);
 		}
 	}
 
diff --git a/tests/src/Core/StorageManagerTest.php b/tests/src/Core/StorageManagerTest.php
index c6f4558b70..f061ea0fff 100644
--- a/tests/src/Core/StorageManagerTest.php
+++ b/tests/src/Core/StorageManagerTest.php
@@ -87,7 +87,7 @@ class StorageManagerTest extends DatabaseTest
 	{
 		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
 
-		$this->assertInstanceOf(StorageManager::class, $storageManager);
+		self::assertInstanceOf(StorageManager::class, $storageManager);
 	}
 
 	public function dataStorages()
@@ -172,12 +172,12 @@ class StorageManagerTest extends DatabaseTest
 		$storage = $storageManager->getByName($name, $userBackend);
 
 		if (!empty($assert)) {
-			$this->assertInstanceOf(Storage\IStorage::class, $storage);
-			$this->assertInstanceOf($assert, $storage);
+			self::assertInstanceOf(Storage\IStorage::class, $storage);
+			self::assertInstanceOf($assert, $storage);
 		} else {
-			$this->assertNull($storage);
+			self::assertNull($storage);
 		}
-		$this->assertEquals($assertName, $storage);
+		self::assertEquals($assertName, $storage);
 	}
 
 	/**
@@ -190,10 +190,10 @@ class StorageManagerTest extends DatabaseTest
 		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
 
 		// true in every of the backends
-		$this->assertEquals(!empty($assertName), $storageManager->isValidBackend($name));
+		self::assertEquals(!empty($assertName), $storageManager->isValidBackend($name));
 
 		// if userBackend is set to true, filter out e.g. SystemRessource
-		$this->assertEquals($userBackend, $storageManager->isValidBackend($name, true));
+		self::assertEquals($userBackend, $storageManager->isValidBackend($name, true));
 	}
 
 	/**
@@ -203,7 +203,7 @@ class StorageManagerTest extends DatabaseTest
 	{
 		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
 
-		$this->assertEquals(StorageManager::DEFAULT_BACKENDS, $storageManager->listBackends());
+		self::assertEquals(StorageManager::DEFAULT_BACKENDS, $storageManager->listBackends());
 	}
 
 	/**
@@ -215,12 +215,12 @@ class StorageManagerTest extends DatabaseTest
 	{
 		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
 
-		$this->assertNull($storageManager->getBackend());
+		self::assertNull($storageManager->getBackend());
 
 		if ($userBackend) {
 			$storageManager->setBackend($name);
 
-			$this->assertInstanceOf($assert, $storageManager->getBackend());
+			self::assertInstanceOf($assert, $storageManager->getBackend());
 		}
 	}
 
@@ -237,9 +237,9 @@ class StorageManagerTest extends DatabaseTest
 		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
 
 		if ($userBackend) {
-			$this->assertInstanceOf($assert, $storageManager->getBackend());
+			self::assertInstanceOf($assert, $storageManager->getBackend());
 		} else {
-			$this->assertNull($storageManager->getBackend());
+			self::assertNull($storageManager->getBackend());
 		}
 	}
 
@@ -261,12 +261,12 @@ class StorageManagerTest extends DatabaseTest
 
 		$storageManager = new StorageManager($this->dba, $this->config, $this->logger, $this->l10n);
 
-		$this->assertTrue($storageManager->register(SampleStorageBackend::class));
+		self::assertTrue($storageManager->register(SampleStorageBackend::class));
 
-		$this->assertEquals(array_merge(StorageManager::DEFAULT_BACKENDS, [
+		self::assertEquals(array_merge(StorageManager::DEFAULT_BACKENDS, [
 			SampleStorageBackend::getName() => SampleStorageBackend::class,
 		]), $storageManager->listBackends());
-		$this->assertEquals(array_merge(StorageManager::DEFAULT_BACKENDS, [
+		self::assertEquals(array_merge(StorageManager::DEFAULT_BACKENDS, [
 			SampleStorageBackend::getName() => SampleStorageBackend::class,
 		]), $this->config->get('storage', 'backends'));
 
@@ -274,17 +274,17 @@ class StorageManagerTest extends DatabaseTest
 		SampleStorageBackend::registerHook();
 		Hook::loadHooks();
 
-		$this->assertTrue($storageManager->setBackend(SampleStorageBackend::NAME));
-		$this->assertEquals(SampleStorageBackend::NAME, $this->config->get('storage', 'name'));
+		self::assertTrue($storageManager->setBackend(SampleStorageBackend::NAME));
+		self::assertEquals(SampleStorageBackend::NAME, $this->config->get('storage', 'name'));
 
-		$this->assertInstanceOf(SampleStorageBackend::class, $storageManager->getBackend());
+		self::assertInstanceOf(SampleStorageBackend::class, $storageManager->getBackend());
 
-		$this->assertTrue($storageManager->unregister(SampleStorageBackend::class));
-		$this->assertEquals(StorageManager::DEFAULT_BACKENDS, $this->config->get('storage', 'backends'));
-		$this->assertEquals(StorageManager::DEFAULT_BACKENDS, $storageManager->listBackends());
+		self::assertTrue($storageManager->unregister(SampleStorageBackend::class));
+		self::assertEquals(StorageManager::DEFAULT_BACKENDS, $this->config->get('storage', 'backends'));
+		self::assertEquals(StorageManager::DEFAULT_BACKENDS, $storageManager->listBackends());
 
-		$this->assertNull($storageManager->getBackend());
-		$this->assertNull($this->config->get('storage', 'name'));
+		self::assertNull($storageManager->getBackend());
+		self::assertNull($this->config->get('storage', 'name'));
 	}
 
 	/**
@@ -308,12 +308,12 @@ class StorageManagerTest extends DatabaseTest
 
 		while ($photo = $this->dba->fetch($photos)) {
 
-			$this->assertEmpty($photo['data']);
+			self::assertEmpty($photo['data']);
 
 			$storage = $storageManager->getByName($photo['backend-class']);
 			$data = $storage->get($photo['backend-ref']);
 
-			$this->assertNotEmpty($data);
+			self::assertNotEmpty($data);
 		}
 	}
 
diff --git a/tests/src/Core/SystemTest.php b/tests/src/Core/SystemTest.php
index 3f06ab6d23..2235b37574 100644
--- a/tests/src/Core/SystemTest.php
+++ b/tests/src/Core/SystemTest.php
@@ -42,33 +42,33 @@ class SystemTest extends TestCase
 	private function assertGuid($guid, $length, $prefix = '')
 	{
 		$length -= strlen($prefix);
-		$this->assertRegExp("/^" . $prefix . "[a-z0-9]{" . $length . "}?$/", $guid);
+		self::assertRegExp("/^" . $prefix . "[a-z0-9]{" . $length . "}?$/", $guid);
 	}
 
 	function testGuidWithoutParameter()
 	{
 		$this->useBaseUrl();
 		$guid = System::createGUID();
-		$this->assertGuid($guid, 16);
+		self::assertGuid($guid, 16);
 	}
 
 	function testGuidWithSize32()
 	{
 		$this->useBaseUrl();
 		$guid = System::createGUID(32);
-		$this->assertGuid($guid, 32);
+		self::assertGuid($guid, 32);
 	}
 
 	function testGuidWithSize64()
 	{
 		$this->useBaseUrl();
 		$guid = System::createGUID(64);
-		$this->assertGuid($guid, 64);
+		self::assertGuid($guid, 64);
 	}
 
 	function testGuidWithPrefix()
 	{
 		$guid = System::createGUID(23, 'test');
-		$this->assertGuid($guid, 23, 'test');
+		self::assertGuid($guid, 23, 'test');
 	}
 }
diff --git a/tests/src/Database/DBATest.php b/tests/src/Database/DBATest.php
index aea03e76a2..053acbe649 100644
--- a/tests/src/Database/DBATest.php
+++ b/tests/src/Database/DBATest.php
@@ -32,13 +32,13 @@ class DBATest extends DatabaseTest
 	 */
 	public function testExists() {
 
-		$this->assertTrue(DBA::exists('config', []));
-		$this->assertFalse(DBA::exists('notable', []));
+		self::assertTrue(DBA::exists('config', []));
+		self::assertFalse(DBA::exists('notable', []));
 
-		$this->assertTrue(DBA::exists('config', null));
-		$this->assertFalse(DBA::exists('notable', null));
+		self::assertTrue(DBA::exists('config', null));
+		self::assertFalse(DBA::exists('notable', null));
 
-		$this->assertTrue(DBA::exists('config', ['k' => 'hostname']));
-		$this->assertFalse(DBA::exists('config', ['k' => 'nonsense']));
+		self::assertTrue(DBA::exists('config', ['k' => 'hostname']));
+		self::assertFalse(DBA::exists('config', ['k' => 'nonsense']));
 	}
 }
diff --git a/tests/src/Database/DBStructureTest.php b/tests/src/Database/DBStructureTest.php
index baed645ecd..ee1fb04f87 100644
--- a/tests/src/Database/DBStructureTest.php
+++ b/tests/src/Database/DBStructureTest.php
@@ -44,13 +44,13 @@ class DBStructureTest extends DatabaseTest
 	 * @small
 	 */
 	public function testExists() {
-		$this->assertTrue(DBStructure::existsTable('config'));
+		self::assertTrue(DBStructure::existsTable('config'));
 
-		$this->assertFalse(DBStructure::existsTable('notatable'));
+		self::assertFalse(DBStructure::existsTable('notatable'));
 
-		$this->assertTrue(DBStructure::existsColumn('config', ['k']));
-		$this->assertFalse(DBStructure::existsColumn('config', ['nonsense']));
-		$this->assertFalse(DBStructure::existsColumn('config', ['k', 'nonsense']));
+		self::assertTrue(DBStructure::existsColumn('config', ['k']));
+		self::assertFalse(DBStructure::existsColumn('config', ['nonsense']));
+		self::assertFalse(DBStructure::existsColumn('config', ['k', 'nonsense']));
 	}
 
 	/**
@@ -62,13 +62,13 @@ class DBStructureTest extends DatabaseTest
 		$fromType = 'varbinary(255) not null';
 		$toType = 'varbinary(255) not null comment \'Test To Type\'';
 
-		$this->assertTrue(DBStructure::rename('config', [ $fromColumn => [ $toColumn, $toType ]]));
-		$this->assertTrue(DBStructure::existsColumn('config', [ $toColumn ]));
-		$this->assertFalse(DBStructure::existsColumn('config', [ $fromColumn ]));
+		self::assertTrue(DBStructure::rename('config', [ $fromColumn => [ $toColumn, $toType ]]));
+		self::assertTrue(DBStructure::existsColumn('config', [ $toColumn ]));
+		self::assertFalse(DBStructure::existsColumn('config', [ $fromColumn ]));
 
-		$this->assertTrue(DBStructure::rename('config', [ $toColumn => [ $fromColumn, $fromType ]]));
-		$this->assertTrue(DBStructure::existsColumn('config', [ $fromColumn ]));
-		$this->assertFalse(DBStructure::existsColumn('config', [ $toColumn ]));
+		self::assertTrue(DBStructure::rename('config', [ $toColumn => [ $fromColumn, $fromType ]]));
+		self::assertTrue(DBStructure::existsColumn('config', [ $fromColumn ]));
+		self::assertFalse(DBStructure::existsColumn('config', [ $toColumn ]));
 	}
 
 	/**
@@ -79,7 +79,7 @@ class DBStructureTest extends DatabaseTest
 		$oldID = 'client_id';
 		$newID = 'pw';
 
-		$this->assertTrue(DBStructure::rename('clients', [ $newID ], DBStructure::RENAME_PRIMARY_KEY));
-		$this->assertTrue(DBStructure::rename('clients', [ $oldID ], DBStructure::RENAME_PRIMARY_KEY));
+		self::assertTrue(DBStructure::rename('clients', [ $newID ], DBStructure::RENAME_PRIMARY_KEY));
+		self::assertTrue(DBStructure::rename('clients', [ $oldID ], DBStructure::RENAME_PRIMARY_KEY));
 	}
 }
diff --git a/tests/src/Model/FileTagTest.php b/tests/src/Model/FileTagTest.php
index b12261d700..73bfe2234c 100644
--- a/tests/src/Model/FileTagTest.php
+++ b/tests/src/Model/FileTagTest.php
@@ -73,7 +73,7 @@ class FileTagTest extends TestCase
      */
     public function testArrayToFile(array $array, string $type, string $file)
     {
-        $this->assertEquals($file, FileTag::arrayToFile($array, $type));
+        self::assertEquals($file, FileTag::arrayToFile($array, $type));
     }
 
     public function dataFileToArray()
@@ -133,6 +133,6 @@ class FileTagTest extends TestCase
      */
     public function testFileToArray(string $file, string $type, array $array)
     {
-        $this->assertEquals($array, FileTag::fileToArray($file, $type));
+        self::assertEquals($array, FileTag::fileToArray($file, $type));
     }
 }
diff --git a/tests/src/Model/ProcessTest.php b/tests/src/Model/ProcessTest.php
index 389e2ac703..490cd34c7a 100644
--- a/tests/src/Model/ProcessTest.php
+++ b/tests/src/Model/ProcessTest.php
@@ -41,22 +41,22 @@ class ProcessTest extends DatabaseTest
 	{
 		$process = new Process($this->dba);
 
-		$this->assertEquals(0, $this->dba->count('process'));
+		self::assertEquals(0, $this->dba->count('process'));
 		$process->insert('test', 1);
 		$process->insert('test2', 2);
 		$process->insert('test3', 3);
 
-		$this->assertEquals(3, $this->dba->count('process'));
+		self::assertEquals(3, $this->dba->count('process'));
 
-		$this->assertEquals([
+		self::assertEquals([
 			['command' => 'test']
 		], $this->dba->selectToArray('process', ['command'], ['pid' => 1]));
 
 		$process->deleteByPid(1);
 
-		$this->assertEmpty($this->dba->selectToArray('process', ['command'], ['pid' => 1]));
+		self::assertEmpty($this->dba->selectToArray('process', ['command'], ['pid' => 1]));
 
-		$this->assertEquals(2, $this->dba->count('process'));
+		self::assertEquals(2, $this->dba->count('process'));
 	}
 
 	public function testDoubleInsert()
@@ -68,7 +68,7 @@ class ProcessTest extends DatabaseTest
 		// double insert doesn't work
 		$process->insert('test23', 1);
 
-		$this->assertEquals([['command' => 'test']], $this->dba->selectToArray('process', ['command'], ['pid' => 1]));
+		self::assertEquals([['command' => 'test']], $this->dba->selectToArray('process', ['command'], ['pid' => 1]));
 	}
 
 	public function testWrongDelete()
diff --git a/tests/src/Model/Storage/DatabaseStorageTest.php b/tests/src/Model/Storage/DatabaseStorageTest.php
index cf29aedf95..ceebc65044 100644
--- a/tests/src/Model/Storage/DatabaseStorageTest.php
+++ b/tests/src/Model/Storage/DatabaseStorageTest.php
@@ -66,6 +66,6 @@ class DatabaseStorageTest extends StorageTest
 
 	protected function assertOption(IStorage $storage)
 	{
-		$this->assertEmpty($storage->getOptions());
+		self::assertEmpty($storage->getOptions());
 	}
 }
diff --git a/tests/src/Model/Storage/FilesystemStorageTest.php b/tests/src/Model/Storage/FilesystemStorageTest.php
index 5e508ddb06..232c0fc4bf 100644
--- a/tests/src/Model/Storage/FilesystemStorageTest.php
+++ b/tests/src/Model/Storage/FilesystemStorageTest.php
@@ -66,7 +66,7 @@ class FilesystemStorageTest extends StorageTest
 
 	protected function assertOption(IStorage $storage)
 	{
-		$this->assertEquals([
+		self::assertEquals([
 			'storagepath' => [
 				'input', 'Storage base path',
 				$this->root->getChild('storage')->url(),
@@ -119,12 +119,12 @@ class FilesystemStorageTest extends StorageTest
 		$dir = $this->root->getChild('storage/f0/c0')->url();
 		$file = $this->root->getChild('storage/f0/c0/d0i0')->url();
 
-		$this->assertDirectoryExists($dir);
-		$this->assertFileExists($file);
+		self::assertDirectoryExists($dir);
+		self::assertFileExists($file);
 
-		$this->assertDirectoryIsWritable($dir);
-		$this->assertFileIsWritable($file);
+		self::assertDirectoryIsWritable($dir);
+		self::assertFileIsWritable($file);
 
-		$this->assertEquals('test', file_get_contents($file));
+		self::assertEquals('test', file_get_contents($file));
 	}
 }
diff --git a/tests/src/Model/Storage/StorageTest.php b/tests/src/Model/Storage/StorageTest.php
index d8b3c6cb77..414aa9ea32 100644
--- a/tests/src/Model/Storage/StorageTest.php
+++ b/tests/src/Model/Storage/StorageTest.php
@@ -37,7 +37,7 @@ abstract class StorageTest extends MockedTest
 	public function testInstance()
 	{
 		$instance = $this->getInstance();
-		$this->assertInstanceOf(IStorage::class, $instance);
+		self::assertInstanceOf(IStorage::class, $instance);
 	}
 
 	/**
@@ -58,11 +58,11 @@ abstract class StorageTest extends MockedTest
 		$instance = $this->getInstance();
 
 		$ref = $instance->put('data12345');
-		$this->assertNotEmpty($ref);
+		self::assertNotEmpty($ref);
 
-		$this->assertEquals('data12345', $instance->get($ref));
+		self::assertEquals('data12345', $instance->get($ref));
 
-		$this->assertTrue($instance->delete($ref));
+		self::assertTrue($instance->delete($ref));
 	}
 
 	/**
@@ -73,7 +73,7 @@ abstract class StorageTest extends MockedTest
 		$instance = $this->getInstance();
 
 		// Even deleting not existing references should return "true"
-		$this->assertTrue($instance->delete(-1234456));
+		self::assertTrue($instance->delete(-1234456));
 	}
 
 	/**
@@ -84,7 +84,7 @@ abstract class StorageTest extends MockedTest
 		$instance = $this->getInstance();
 
 		// Invalid references return an empty string
-		$this->assertEmpty($instance->get(-123456));
+		self::assertEmpty($instance->get(-123456));
 	}
 
 	/**
@@ -95,12 +95,12 @@ abstract class StorageTest extends MockedTest
 		$instance = $this->getInstance();
 
 		$ref = $instance->put('data12345');
-		$this->assertNotEmpty($ref);
+		self::assertNotEmpty($ref);
 
-		$this->assertEquals('data12345', $instance->get($ref));
+		self::assertEquals('data12345', $instance->get($ref));
 
-		$this->assertEquals($ref, $instance->put('data5432', $ref));
-		$this->assertEquals('data5432', $instance->get($ref));
+		self::assertEquals($ref, $instance->put('data5432', $ref));
+		self::assertEquals('data5432', $instance->get($ref));
 	}
 
 	/**
@@ -110,6 +110,6 @@ abstract class StorageTest extends MockedTest
 	{
 		$instance = $this->getInstance();
 
-		$this->assertEquals(-123, $instance->put('data12345', -123));
+		self::assertEquals(-123, $instance->put('data12345', -123));
 	}
 }
diff --git a/tests/src/Model/User/CookieTest.php b/tests/src/Model/User/CookieTest.php
index 40c99f3ea7..e8dba95576 100644
--- a/tests/src/Model/User/CookieTest.php
+++ b/tests/src/Model/User/CookieTest.php
@@ -60,7 +60,7 @@ class CookieTest extends MockedTest
 		$this->config->shouldReceive('get')->with('system', 'auth_cookie_lifetime', Cookie::DEFAULT_EXPIRE)->andReturn('7')->once();
 
 		$cookie = new Cookie($this->config, $this->baseUrl);
-		$this->assertInstanceOf(Cookie::class, $cookie);
+		self::assertInstanceOf(Cookie::class, $cookie);
 	}
 
 	public function dataGet()
@@ -124,31 +124,31 @@ class CookieTest extends MockedTest
 		$this->config->shouldReceive('get')->with('system', 'auth_cookie_lifetime', Cookie::DEFAULT_EXPIRE)->andReturn('7')->once();
 
 		$cookie = new Cookie($this->config, $this->baseUrl, [], $cookieData);
-		$this->assertInstanceOf(Cookie::class, $cookie);
+		self::assertInstanceOf(Cookie::class, $cookie);
 
 		$assertData = $cookie->getData();
 
 		if (!$hasValues) {
-			$this->assertEmpty($assertData);
+			self::assertEmpty($assertData);
 		} else {
-			$this->assertNotEmpty($assertData);
+			self::assertNotEmpty($assertData);
 			if (isset($uid)) {
-				$this->assertObjectHasAttribute('uid', $assertData);
-				$this->assertEquals($uid, $assertData->uid);
+				self::assertObjectHasAttribute('uid', $assertData);
+				self::assertEquals($uid, $assertData->uid);
 			} else {
-				$this->assertObjectNotHasAttribute('uid', $assertData);
+				self::assertObjectNotHasAttribute('uid', $assertData);
 			}
 			if (isset($hash)) {
-				$this->assertObjectHasAttribute('hash', $assertData);
-				$this->assertEquals($hash, $assertData->hash);
+				self::assertObjectHasAttribute('hash', $assertData);
+				self::assertEquals($hash, $assertData->hash);
 			} else {
-				$this->assertObjectNotHasAttribute('hash', $assertData);
+				self::assertObjectNotHasAttribute('hash', $assertData);
 			}
 			if (isset($ip)) {
-				$this->assertObjectHasAttribute('ip', $assertData);
-				$this->assertEquals($ip, $assertData->ip);
+				self::assertObjectHasAttribute('ip', $assertData);
+				self::assertEquals($ip, $assertData->ip);
 			} else {
-				$this->assertObjectNotHasAttribute('ip', $assertData);
+				self::assertObjectNotHasAttribute('ip', $assertData);
 			}
 		}
 	}
@@ -192,9 +192,9 @@ class CookieTest extends MockedTest
 		$this->config->shouldReceive('get')->with('system', 'auth_cookie_lifetime', Cookie::DEFAULT_EXPIRE)->andReturn('7')->once();
 
 		$cookie = new Cookie($this->config, $this->baseUrl);
-		$this->assertInstanceOf(Cookie::class, $cookie);
+		self::assertInstanceOf(Cookie::class, $cookie);
 
-		$this->assertEquals($assertTrue, $cookie->check($assertHash, $password, $userPrivateKey));
+		self::assertEquals($assertTrue, $cookie->check($assertHash, $password, $userPrivateKey));
 	}
 
 	public function dataSet()
@@ -245,21 +245,21 @@ class CookieTest extends MockedTest
 
 	public function assertCookie($uid, $hash, $remoteIp, $lifetime)
 	{
-		$this->assertArrayHasKey(Cookie::NAME, StaticCookie::$_COOKIE);
+		self::assertArrayHasKey(Cookie::NAME, StaticCookie::$_COOKIE);
 
 		$data = json_decode(StaticCookie::$_COOKIE[Cookie::NAME]);
 
-		$this->assertObjectHasAttribute('uid', $data);
-		$this->assertEquals($uid, $data->uid);
-		$this->assertObjectHasAttribute('hash', $data);
-		$this->assertEquals($hash, $data->hash);
-		$this->assertObjectHasAttribute('ip', $data);
-		$this->assertEquals($remoteIp, $data->ip);
+		self::assertObjectHasAttribute('uid', $data);
+		self::assertEquals($uid, $data->uid);
+		self::assertObjectHasAttribute('hash', $data);
+		self::assertEquals($hash, $data->hash);
+		self::assertObjectHasAttribute('ip', $data);
+		self::assertEquals($remoteIp, $data->ip);
 
 		if (isset($lifetime) && $lifetime !== 0) {
-			$this->assertLessThanOrEqual(time() + $lifetime, StaticCookie::$_EXPIRE);
+			self::assertLessThanOrEqual(time() + $lifetime, StaticCookie::$_EXPIRE);
 		} else {
-			$this->assertLessThanOrEqual(time() + Cookie::DEFAULT_EXPIRE * 24 * 60 * 60, StaticCookie::$_EXPIRE);
+			self::assertLessThanOrEqual(time() + Cookie::DEFAULT_EXPIRE * 24 * 60 * 60, StaticCookie::$_EXPIRE);
 		}
 	}
 
@@ -275,11 +275,11 @@ class CookieTest extends MockedTest
 		$this->config->shouldReceive('get')->with('system', 'auth_cookie_lifetime', Cookie::DEFAULT_EXPIRE)->andReturn(Cookie::DEFAULT_EXPIRE)->once();
 
 		$cookie = new StaticCookie($this->config, $this->baseUrl, $serverArray);
-		$this->assertInstanceOf(Cookie::class, $cookie);
+		self::assertInstanceOf(Cookie::class, $cookie);
 
 		$cookie->set($uid, $password, $privateKey, $lifetime);
 
-		$this->assertCookie($uid, $assertHash, $remoteIp, $lifetime);
+		self::assertCookie($uid, $assertHash, $remoteIp, $lifetime);
 	}
 
 	/**
@@ -294,14 +294,14 @@ class CookieTest extends MockedTest
 		$this->config->shouldReceive('get')->with('system', 'auth_cookie_lifetime', Cookie::DEFAULT_EXPIRE)->andReturn(Cookie::DEFAULT_EXPIRE)->once();
 
 		$cookie = new StaticCookie($this->config, $this->baseUrl, $serverArray);
-		$this->assertInstanceOf(Cookie::class, $cookie);
+		self::assertInstanceOf(Cookie::class, $cookie);
 
 		// Invalid set, should get overwritten
 		$cookie->set(-1, 'invalid', 'nothing', -234);
 
 		$cookie->set($uid, $password, $privateKey, $lifetime);
 
-		$this->assertCookie($uid, $assertHash, $remoteIp, $lifetime);
+		self::assertCookie($uid, $assertHash, $remoteIp, $lifetime);
 	}
 
 	/**
@@ -318,14 +318,14 @@ class CookieTest extends MockedTest
 		$this->config->shouldReceive('get')->with('system', 'auth_cookie_lifetime', Cookie::DEFAULT_EXPIRE)->andReturn(Cookie::DEFAULT_EXPIRE)->once();
 
 		$cookie = new StaticCookie($this->config, $this->baseUrl);
-		$this->assertInstanceOf(Cookie::class, $cookie);
+		self::assertInstanceOf(Cookie::class, $cookie);
 
-		$this->assertEquals('test', StaticCookie::$_COOKIE[Cookie::NAME]);
-		$this->assertEquals(null, StaticCookie::$_EXPIRE);
+		self::assertEquals('test', StaticCookie::$_COOKIE[Cookie::NAME]);
+		self::assertEquals(null, StaticCookie::$_EXPIRE);
 
 		$cookie->clear();
 
-		$this->assertEmpty(StaticCookie::$_COOKIE[Cookie::NAME]);
-		$this->assertEquals(-3600, StaticCookie::$_EXPIRE);
+		self::assertEmpty(StaticCookie::$_COOKIE[Cookie::NAME]);
+		self::assertEquals(-3600, StaticCookie::$_EXPIRE);
 	}
 }
diff --git a/tests/src/Model/UserTest.php b/tests/src/Model/UserTest.php
index bc0db13f4a..b64ea330fb 100644
--- a/tests/src/Model/UserTest.php
+++ b/tests/src/Model/UserTest.php
@@ -72,7 +72,7 @@ class UserTest extends MockedTest
 
 		$record = User::identities($this->parent['uid']);
 
-		$this->assertEquals([], $record);
+		self::assertEquals([], $record);
 	}
 
 	public function testIdentitiesAsParent()
@@ -109,7 +109,7 @@ class UserTest extends MockedTest
 
 		$record = User::identities($this->parent['uid']);
 
-		$this->assertEquals([
+		self::assertEquals([
 			$this->parent,
 			$this->child,
 			$this->manage
@@ -162,7 +162,7 @@ class UserTest extends MockedTest
 
 		$record = User::identities($this->child['uid']);
 
-		$this->assertEquals([
+		self::assertEquals([
 			$this->parent,
 			$this->child,
 			$this->manage
diff --git a/tests/src/Module/Api/Twitter/ContactEndpointTest.php b/tests/src/Module/Api/Twitter/ContactEndpointTest.php
index e23b836825..677790d63f 100644
--- a/tests/src/Module/Api/Twitter/ContactEndpointTest.php
+++ b/tests/src/Module/Api/Twitter/ContactEndpointTest.php
@@ -12,9 +12,9 @@ class ContactEndpointTest extends FixtureTest
 {
 	public function testGetUid()
 	{
-		$this->assertSame(42, ContactEndpointMock::getUid(42));
-		$this->assertSame(42, ContactEndpointMock::getUid(null, 'selfcontact'));
-		$this->assertSame(42, ContactEndpointMock::getUid(84, 'selfcontact'));
+		self::assertSame(42, ContactEndpointMock::getUid(42));
+		self::assertSame(42, ContactEndpointMock::getUid(null, 'selfcontact'));
+		self::assertSame(42, ContactEndpointMock::getUid(84, 'selfcontact'));
 	}
 
 	public function testGetUidContactIdNotFound()
@@ -52,7 +52,7 @@ class ContactEndpointTest extends FixtureTest
 			'total_count' => 0,
 		];
 
-		$this->assertSame($expectedEmpty, ContactEndpointMock::ids(Contact::FOLLOWER, 42));
+		self::assertSame($expectedEmpty, ContactEndpointMock::ids(Contact::FOLLOWER, 42));
 
 		$expectedFriend = [
 			'ids' => [47],
@@ -63,20 +63,20 @@ class ContactEndpointTest extends FixtureTest
 			'total_count' => 1,
 		];
 
-		$this->assertSame($expectedFriend, ContactEndpointMock::ids(Contact::FRIEND, 42));
-		$this->assertSame($expectedFriend, ContactEndpointMock::ids([Contact::FOLLOWER, Contact::FRIEND], 42));
+		self::assertSame($expectedFriend, ContactEndpointMock::ids(Contact::FRIEND, 42));
+		self::assertSame($expectedFriend, ContactEndpointMock::ids([Contact::FOLLOWER, Contact::FRIEND], 42));
 
 		$result = ContactEndpointMock::ids(Contact::SHARING, 42);
 
-		$this->assertArrayHasKey('ids', $result);
-		$this->assertContainsOnly('int', $result['ids']);
-		$this->assertSame(45, $result['ids'][0]);
+		self::assertArrayHasKey('ids', $result);
+		self::assertContainsOnly('int', $result['ids']);
+		self::assertSame(45, $result['ids'][0]);
 
 		$result = ContactEndpointMock::ids([Contact::SHARING, Contact::FRIEND], 42);
 
-		$this->assertArrayHasKey('ids', $result);
-		$this->assertContainsOnly('int', $result['ids']);
-		$this->assertSame(45, $result['ids'][0]);
+		self::assertArrayHasKey('ids', $result);
+		self::assertContainsOnly('int', $result['ids']);
+		self::assertSame(45, $result['ids'][0]);
 	}
 
 	/**
@@ -88,9 +88,9 @@ class ContactEndpointTest extends FixtureTest
 	{
 		$result = ContactEndpointMock::ids(Contact::SHARING, 42, -1, ContactEndpoint::DEFAULT_COUNT, true);
 
-		$this->assertArrayHasKey('ids', $result);
-		$this->assertContainsOnly('string', $result['ids']);
-		$this->assertSame('45', $result['ids'][0]);
+		self::assertArrayHasKey('ids', $result);
+		self::assertContainsOnly('string', $result['ids']);
+		self::assertSame('45', $result['ids'][0]);
 	}
 
 	public function testIdsPagination()
@@ -106,7 +106,7 @@ class ContactEndpointTest extends FixtureTest
 
 		$result = ContactEndpointMock::ids([Contact::SHARING, Contact::FRIEND], 42, -1, 1);
 
-		$this->assertSame($expectedDefaultPageResult, $result);
+		self::assertSame($expectedDefaultPageResult, $result);
 
 		$nextPageCursor = $result['next_cursor'];
 
@@ -121,7 +121,7 @@ class ContactEndpointTest extends FixtureTest
 
 		$result = ContactEndpointMock::ids([Contact::SHARING, Contact::FRIEND], 42, $nextPageCursor, 1);
 
-		$this->assertSame($expectedSecondPageResult, $result);
+		self::assertSame($expectedSecondPageResult, $result);
 
 		$firstPageCursor = $result['previous_cursor'];
 		$emptyNextPageCursor = $result['next_cursor'];
@@ -137,7 +137,7 @@ class ContactEndpointTest extends FixtureTest
 
 		$result = ContactEndpointMock::ids([Contact::SHARING, Contact::FRIEND], 42, $firstPageCursor, 1);
 
-		$this->assertSame($expectedFirstPageResult, $result);
+		self::assertSame($expectedFirstPageResult, $result);
 
 		$emptyPrevPageCursor = $result['previous_cursor'];
 
@@ -152,7 +152,7 @@ class ContactEndpointTest extends FixtureTest
 
 		$result = ContactEndpointMock::ids([Contact::SHARING, Contact::FRIEND], 42, $emptyPrevPageCursor, 1);
 
-		$this->assertSame($expectedEmptyPrevPageResult, $result);
+		self::assertSame($expectedEmptyPrevPageResult, $result);
 
 		$expectedEmptyNextPageResult = [
 			'ids' => [],
@@ -165,7 +165,7 @@ class ContactEndpointTest extends FixtureTest
 
 		$result = ContactEndpointMock::ids([Contact::SHARING, Contact::FRIEND], 42, $emptyNextPageCursor, 1);
 
-		$this->assertSame($expectedEmptyNextPageResult, $result);
+		self::assertSame($expectedEmptyNextPageResult, $result);
 	}
 
 	/**
@@ -186,7 +186,7 @@ class ContactEndpointTest extends FixtureTest
 			'total_count' => 0,
 		];
 
-		$this->assertSame($expectedEmpty, ContactEndpointMock::list(Contact::FOLLOWER, 42));
+		self::assertSame($expectedEmpty, ContactEndpointMock::list(Contact::FOLLOWER, 42));
 
 		$expectedFriendContactUser = [
 			'id' => 45,
@@ -241,14 +241,14 @@ class ContactEndpointTest extends FixtureTest
 
 		$result = ContactEndpointMock::list(Contact::SHARING, 42);
 
-		$this->assertArrayHasKey('users', $result);
-		$this->assertContainsOnlyInstancesOf(User::class, $result['users']);
-		$this->assertSame($expectedFriendContactUser, $result['users'][0]->toArray());
+		self::assertArrayHasKey('users', $result);
+		self::assertContainsOnlyInstancesOf(User::class, $result['users']);
+		self::assertSame($expectedFriendContactUser, $result['users'][0]->toArray());
 
 		$result = ContactEndpointMock::list([Contact::SHARING, Contact::FRIEND], 42);
 
-		$this->assertArrayHasKey('users', $result);
-		$this->assertContainsOnlyInstancesOf(User::class, $result['users']);
-		$this->assertSame($expectedFriendContactUser, $result['users'][0]->toArray());
+		self::assertArrayHasKey('users', $result);
+		self::assertContainsOnlyInstancesOf(User::class, $result['users']);
+		self::assertSame($expectedFriendContactUser, $result['users'][0]->toArray());
 	}
 }
diff --git a/tests/src/Network/CurlResultTest.php b/tests/src/Network/CurlResultTest.php
index e066fb89b0..b13de5395f 100644
--- a/tests/src/Network/CurlResultTest.php
+++ b/tests/src/Network/CurlResultTest.php
@@ -62,14 +62,14 @@ class CurlResultTest extends TestCase
 			'url' => 'https://test.local'
 		]);
 
-		$this->assertTrue($curlResult->isSuccess());
-		$this->assertFalse($curlResult->isTimeout());
-		$this->assertFalse($curlResult->isRedirectUrl());
-		$this->assertSame($header, $curlResult->getHeader());
-		$this->assertSame($body, $curlResult->getBody());
-		$this->assertSame('text/html; charset=utf-8', $curlResult->getContentType());
-		$this->assertSame('https://test.local', $curlResult->getUrl());
-		$this->assertSame('https://test.local', $curlResult->getRedirectUrl());
+		self::assertTrue($curlResult->isSuccess());
+		self::assertFalse($curlResult->isTimeout());
+		self::assertFalse($curlResult->isRedirectUrl());
+		self::assertSame($header, $curlResult->getHeader());
+		self::assertSame($body, $curlResult->getBody());
+		self::assertSame('text/html; charset=utf-8', $curlResult->getContentType());
+		self::assertSame('https://test.local', $curlResult->getUrl());
+		self::assertSame('https://test.local', $curlResult->getRedirectUrl());
 	}
 
 	/**
@@ -90,14 +90,14 @@ class CurlResultTest extends TestCase
 			'redirect_url' => 'https://test.other'
 		]);
 
-		$this->assertTrue($curlResult->isSuccess());
-		$this->assertFalse($curlResult->isTimeout());
-		$this->assertTrue($curlResult->isRedirectUrl());
-		$this->assertSame($header, $curlResult->getHeader());
-		$this->assertSame($body, $curlResult->getBody());
-		$this->assertSame('text/html; charset=utf-8', $curlResult->getContentType());
-		$this->assertSame('https://test.local/test/it', $curlResult->getUrl());
-		$this->assertSame('https://test.other/test/it', $curlResult->getRedirectUrl());
+		self::assertTrue($curlResult->isSuccess());
+		self::assertFalse($curlResult->isTimeout());
+		self::assertTrue($curlResult->isRedirectUrl());
+		self::assertSame($header, $curlResult->getHeader());
+		self::assertSame($body, $curlResult->getBody());
+		self::assertSame('text/html; charset=utf-8', $curlResult->getContentType());
+		self::assertSame('https://test.local/test/it', $curlResult->getUrl());
+		self::assertSame('https://test.other/test/it', $curlResult->getRedirectUrl());
 	}
 
 	/**
@@ -116,14 +116,14 @@ class CurlResultTest extends TestCase
 			'redirect_url' => 'https://test.other'
 		], CURLE_OPERATION_TIMEDOUT, 'Tested error');
 
-		$this->assertFalse($curlResult->isSuccess());
-		$this->assertTrue($curlResult->isTimeout());
-		$this->assertFalse($curlResult->isRedirectUrl());
-		$this->assertSame($header, $curlResult->getHeader());
-		$this->assertSame($body, $curlResult->getBody());
-		$this->assertSame('text/html; charset=utf-8', $curlResult->getContentType());
-		$this->assertSame('https://test.local/test/it', $curlResult->getRedirectUrl());
-		$this->assertSame('Tested error', $curlResult->getError());
+		self::assertFalse($curlResult->isSuccess());
+		self::assertTrue($curlResult->isTimeout());
+		self::assertFalse($curlResult->isRedirectUrl());
+		self::assertSame($header, $curlResult->getHeader());
+		self::assertSame($body, $curlResult->getBody());
+		self::assertSame('text/html; charset=utf-8', $curlResult->getContentType());
+		self::assertSame('https://test.local/test/it', $curlResult->getRedirectUrl());
+		self::assertSame('Tested error', $curlResult->getError());
 	}
 
 	/**
@@ -143,14 +143,14 @@ class CurlResultTest extends TestCase
 			'url' => 'https://test.local/test/it?key=value',
 		]);
 
-		$this->assertTrue($curlResult->isSuccess());
-		$this->assertFalse($curlResult->isTimeout());
-		$this->assertTrue($curlResult->isRedirectUrl());
-		$this->assertSame($header, $curlResult->getHeader());
-		$this->assertSame($body, $curlResult->getBody());
-		$this->assertSame('text/html; charset=utf-8', $curlResult->getContentType());
-		$this->assertSame('https://test.local/test/it?key=value', $curlResult->getUrl());
-		$this->assertSame('https://test.other/some/?key=value', $curlResult->getRedirectUrl());
+		self::assertTrue($curlResult->isSuccess());
+		self::assertFalse($curlResult->isTimeout());
+		self::assertTrue($curlResult->isRedirectUrl());
+		self::assertSame($header, $curlResult->getHeader());
+		self::assertSame($body, $curlResult->getBody());
+		self::assertSame('text/html; charset=utf-8', $curlResult->getContentType());
+		self::assertSame('https://test.local/test/it?key=value', $curlResult->getUrl());
+		self::assertSame('https://test.other/some/?key=value', $curlResult->getRedirectUrl());
 	}
 
 	/**
@@ -166,8 +166,8 @@ class CurlResultTest extends TestCase
 			'content_type' => 'text/html; charset=utf-8',
 			'url' => 'https://test.local'
 		]);
-		$this->assertTrue($curlResult->inHeader('vary'));
-		$this->assertFalse($curlResult->inHeader('wrongHeader'));
+		self::assertTrue($curlResult->inHeader('vary'));
+		self::assertFalse($curlResult->inHeader('wrongHeader'));
 	}
 
 	 /**
@@ -186,8 +186,8 @@ class CurlResultTest extends TestCase
 
 		$headers = $curlResult->getHeaderArray();
 
-		$this->assertNotEmpty($headers);
-		$this->assertArrayHasKey('vary', $headers);
+		self::assertNotEmpty($headers);
+		self::assertArrayHasKey('vary', $headers);
 	}
 
 	 /**
@@ -204,7 +204,7 @@ class CurlResultTest extends TestCase
 			'url' => 'https://test.local'
 		]);
 
-		$this->assertNotEmpty($curlResult->getHeader());
-		$this->assertEmpty($curlResult->getHeader('wrongHeader'));
+		self::assertNotEmpty($curlResult->getHeader());
+		self::assertEmpty($curlResult->getHeader('wrongHeader'));
 	}
 }
diff --git a/tests/src/Network/ProbeTest.php b/tests/src/Network/ProbeTest.php
index 2dfc0e2ac8..58711cb916 100644
--- a/tests/src/Network/ProbeTest.php
+++ b/tests/src/Network/ProbeTest.php
@@ -85,7 +85,7 @@ class ProbeTest extends TestCase
 
 				$feedLink = Probe::getFeedLink($url, $body);
 
-				$this->assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
+				self::assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
 			}
 		}
 	}
@@ -101,7 +101,7 @@ class ProbeTest extends TestCase
 
 				$feedLink = Probe::getFeedLink('http://example.com', $body);
 
-				$this->assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
+				self::assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
 			}
 		}
 	}
diff --git a/tests/src/Protocol/ActivityTest.php b/tests/src/Protocol/ActivityTest.php
index edea12fdff..e9e23660ea 100644
--- a/tests/src/Protocol/ActivityTest.php
+++ b/tests/src/Protocol/ActivityTest.php
@@ -72,14 +72,14 @@ class ActivityTest extends MockedTest
 	{
 		$activity = new Activity();
 
-		$this->assertEquals($assert, $activity->match($haystack, $needle));
+		self::assertEquals($assert, $activity->match($haystack, $needle));
 	}
 
 	public function testIsHidden()
 	{
 		$activity = new Activity();
 
-		$this->assertTrue($activity->isHidden(Activity::LIKE));
-		$this->assertFalse($activity->isHidden(Activity\ObjectType::BOOKMARK));
+		self::assertTrue($activity->isHidden(Activity::LIKE));
+		self::assertFalse($activity->isHidden(Activity\ObjectType::BOOKMARK));
 	}
 }
diff --git a/tests/src/Util/ACLFormaterTest.php b/tests/src/Util/ACLFormaterTest.php
index 37535b5585..d565d0ba95 100644
--- a/tests/src/Util/ACLFormaterTest.php
+++ b/tests/src/Util/ACLFormaterTest.php
@@ -37,18 +37,18 @@ class ACLFormaterTest extends TestCase
 
 		$acl = $aclFormatter->expand($text);
 
-		$this->assertEquals($assert, $acl);
+		self::assertEquals($assert, $acl);
 
-		$this->assertMergable($acl);
+		self::assertMergable($acl);
 	}
 
 	public function assertMergable(array $aclOne, array $aclTwo = [])
 	{
-		$this->assertTrue(is_array($aclOne));
-		$this->assertTrue(is_array($aclTwo));
+		self::assertTrue(is_array($aclOne));
+		self::assertTrue(is_array($aclTwo));
 
 		$aclMerged = array_unique(array_merge($aclOne, $aclTwo));
-		$this->assertTrue(is_array($aclMerged));
+		self::assertTrue(is_array($aclMerged));
 
 		return $aclMerged;
 	}
@@ -118,7 +118,7 @@ class ACLFormaterTest extends TestCase
 	 */
 	public function testExpand($input, array $assert)
 	{
-		$this->assertAcl($input, $assert);
+		self::assertAcl($input, $assert);
 	}
 
 	/**
@@ -131,11 +131,11 @@ class ACLFormaterTest extends TestCase
 		$allow_people = $aclFormatter->expand();
 		$allow_groups = $aclFormatter->expand();
 
-		$this->assertEmpty($aclFormatter->expand(null));
-		$this->assertEmpty($aclFormatter->expand());
+		self::assertEmpty($aclFormatter->expand(null));
+		self::assertEmpty($aclFormatter->expand());
 
 		$recipients   = array_unique(array_merge($allow_people, $allow_groups));
-		$this->assertEmpty($recipients);
+		self::assertEmpty($recipients);
 	}
 
 	public function dataAclToString()
@@ -188,6 +188,6 @@ class ACLFormaterTest extends TestCase
 	{
 		$aclFormatter = new ACLFormatter();
 
-		$this->assertEquals($assert, $aclFormatter->toString($input));
+		self::assertEquals($assert, $aclFormatter->toString($input));
 	}
 }
diff --git a/tests/src/Util/ArraysTest.php b/tests/src/Util/ArraysTest.php
index 1b82c0b8ff..b29f80584a 100644
--- a/tests/src/Util/ArraysTest.php
+++ b/tests/src/Util/ArraysTest.php
@@ -35,7 +35,7 @@ class ArraysTest extends TestCase
 	public function testEmptyArrayEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([], '');
-		$this->assertEmpty($str);
+		self::assertEmpty($str);
 	}
 
 	/**
@@ -44,7 +44,7 @@ class ArraysTest extends TestCase
 	public function testEmptyArrayNonEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([], ',');
-		$this->assertEmpty($str);
+		self::assertEmpty($str);
 	}
 
 	/**
@@ -53,7 +53,7 @@ class ArraysTest extends TestCase
 	public function testNonEmptyArrayEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([1], '');
-		$this->assertSame($str, '1');
+		self::assertSame($str, '1');
 	}
 
 	/**
@@ -62,7 +62,7 @@ class ArraysTest extends TestCase
 	public function testNonEmptyArray2EmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([1, 2], '');
-		$this->assertSame($str, '12');
+		self::assertSame($str, '12');
 	}
 
 	/**
@@ -71,7 +71,7 @@ class ArraysTest extends TestCase
 	public function testNonEmptyArrayNonEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([1], ',');
-		$this->assertSame($str, '1');
+		self::assertSame($str, '1');
 	}
 
 	/**
@@ -80,7 +80,7 @@ class ArraysTest extends TestCase
 	public function testNonEmptyArray2NonEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([1, 2], ',');
-		$this->assertSame($str, '1,2');
+		self::assertSame($str, '1,2');
 	}
 
 	/**
@@ -89,7 +89,7 @@ class ArraysTest extends TestCase
 	public function testEmptyMultiArray2EmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([[1], []], '');
-		$this->assertSame($str, '{1}{}');
+		self::assertSame($str, '{1}{}');
 	}
 
 	/**
@@ -98,7 +98,7 @@ class ArraysTest extends TestCase
 	public function testEmptyMulti2Array2EmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([[1], [2]], '');
-		$this->assertSame($str, '{1}{2}');
+		self::assertSame($str, '{1}{2}');
 	}
 
 	/**
@@ -107,7 +107,7 @@ class ArraysTest extends TestCase
 	public function testEmptyMultiArray2NonEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([[1], []], ',');
-		$this->assertSame($str, '{1},{}');
+		self::assertSame($str, '{1},{}');
 	}
 
 	/**
@@ -116,7 +116,7 @@ class ArraysTest extends TestCase
 	public function testEmptyMulti2Array2NonEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([[1], [2]], ',');
-		$this->assertSame($str, '{1},{2}');
+		self::assertSame($str, '{1},{2}');
 	}
 
 	/**
@@ -125,6 +125,6 @@ class ArraysTest extends TestCase
 	public function testEmptyMulti3Array2NonEmptyDelimiter()
 	{
 		$str = Arrays::recursiveImplode([[1], [2, [3]]], ',');
-		$this->assertSame($str, '{1},{2,{3}}');
+		self::assertSame($str, '{1},{2,{3}}');
 	}
 }
diff --git a/tests/src/Util/BasePathTest.php b/tests/src/Util/BasePathTest.php
index c9c7b079f9..61c740c79c 100644
--- a/tests/src/Util/BasePathTest.php
+++ b/tests/src/Util/BasePathTest.php
@@ -59,7 +59,7 @@ class BasePathTest extends MockedTest
 	public function testDetermineBasePath(array $server, $input, $output)
 	{
 		$basepath = new BasePath($input, $server);
-		$this->assertEquals($output, $basepath->getPath());
+		self::assertEquals($output, $basepath->getPath());
 	}
 
 	/**
diff --git a/tests/src/Util/BaseURLTest.php b/tests/src/Util/BaseURLTest.php
index 12fcf8858b..83410066b0 100644
--- a/tests/src/Util/BaseURLTest.php
+++ b/tests/src/Util/BaseURLTest.php
@@ -201,11 +201,11 @@ class BaseURLTest extends MockedTest
 
 		$baseUrl = new BaseURL($configMock, $server);
 
-		$this->assertEquals($assert['hostname'], $baseUrl->getHostname());
-		$this->assertEquals($assert['urlPath'], $baseUrl->getUrlPath());
-		$this->assertEquals($assert['sslPolicy'], $baseUrl->getSSLPolicy());
-		$this->assertEquals($assert['scheme'], $baseUrl->getScheme());
-		$this->assertEquals($assert['url'], $baseUrl->get());
+		self::assertEquals($assert['hostname'], $baseUrl->getHostname());
+		self::assertEquals($assert['urlPath'], $baseUrl->getUrlPath());
+		self::assertEquals($assert['sslPolicy'], $baseUrl->getSSLPolicy());
+		self::assertEquals($assert['scheme'], $baseUrl->getScheme());
+		self::assertEquals($assert['url'], $baseUrl->get());
 	}
 
 	public function dataSave()
@@ -320,7 +320,7 @@ class BaseURLTest extends MockedTest
 
 		$baseUrl->save($save['hostname'], $save['sslPolicy'], $save['urlPath']);
 
-		$this->assertEquals($url, $baseUrl->get());
+		self::assertEquals($url, $baseUrl->get());
 	}
 
 	/**
@@ -358,7 +358,7 @@ class BaseURLTest extends MockedTest
 
 		$baseUrl->saveByURL($url);
 
-		$this->assertEquals($url, $baseUrl->get());
+		self::assertEquals($url, $baseUrl->get());
 	}
 
 	public function dataGetBaseUrl()
@@ -417,7 +417,7 @@ class BaseURLTest extends MockedTest
 
 		$baseUrl = new BaseURL($configMock, []);
 
-		$this->assertEquals($assert, $baseUrl->get($ssl));
+		self::assertEquals($assert, $baseUrl->get($ssl));
 	}
 
 	public function dataCheckRedirectHTTPS()
@@ -476,7 +476,7 @@ class BaseURLTest extends MockedTest
 
 		$baseUrl = new BaseURL($configMock, $server);
 
-		$this->assertEquals($redirect, $baseUrl->checkRedirectHttps());
+		self::assertEquals($redirect, $baseUrl->checkRedirectHttps());
 	}
 
 	public function dataWrongSave()
@@ -531,12 +531,12 @@ class BaseURLTest extends MockedTest
 		}
 
 		$baseUrl = new BaseURL($configMock, []);
-		$this->assertFalse($baseUrl->save('test', 10, 'nope'));
+		self::assertFalse($baseUrl->save('test', 10, 'nope'));
 
 		// nothing should have changed because we never successfully saved anything
-		$this->assertEquals($baseUrl->getHostname(), 'friendica.local');
-		$this->assertEquals($baseUrl->getUrlPath(), 'new/test');
-		$this->assertEquals($baseUrl->getSSLPolicy(), BaseURL::DEFAULT_SSL_SCHEME);
-		$this->assertEquals($baseUrl->get(), 'http://friendica.local/new/test');
+		self::assertEquals($baseUrl->getHostname(), 'friendica.local');
+		self::assertEquals($baseUrl->getUrlPath(), 'new/test');
+		self::assertEquals($baseUrl->getSSLPolicy(), BaseURL::DEFAULT_SSL_SCHEME);
+		self::assertEquals($baseUrl->get(), 'http://friendica.local/new/test');
 	}
 }
diff --git a/tests/src/Util/Config/ConfigFileLoaderTest.php b/tests/src/Util/Config/ConfigFileLoaderTest.php
index 57bcc84467..96e54bea05 100644
--- a/tests/src/Util/Config/ConfigFileLoaderTest.php
+++ b/tests/src/Util/Config/ConfigFileLoaderTest.php
@@ -50,7 +50,7 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals($this->root->url(), $configCache->get('system', 'basepath'));
+		self::assertEquals($this->root->url(), $configCache->get('system', 'basepath'));
 	}
 
 	/**
@@ -95,13 +95,13 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals('testhost', $configCache->get('database', 'hostname'));
-		$this->assertEquals('testuser', $configCache->get('database', 'username'));
-		$this->assertEquals('testpw', $configCache->get('database', 'password'));
-		$this->assertEquals('testdb', $configCache->get('database', 'database'));
+		self::assertEquals('testhost', $configCache->get('database', 'hostname'));
+		self::assertEquals('testuser', $configCache->get('database', 'username'));
+		self::assertEquals('testpw', $configCache->get('database', 'password'));
+		self::assertEquals('testdb', $configCache->get('database', 'database'));
 
-		$this->assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
-		$this->assertEquals('Friendica Social Network', $configCache->get('config', 'sitename'));
+		self::assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
+		self::assertEquals('Friendica Social Network', $configCache->get('config', 'sitename'));
 	}
 
 	/**
@@ -127,12 +127,12 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals('testhost', $configCache->get('database', 'hostname'));
-		$this->assertEquals('testuser', $configCache->get('database', 'username'));
-		$this->assertEquals('testpw', $configCache->get('database', 'password'));
-		$this->assertEquals('testdb', $configCache->get('database', 'database'));
+		self::assertEquals('testhost', $configCache->get('database', 'hostname'));
+		self::assertEquals('testuser', $configCache->get('database', 'username'));
+		self::assertEquals('testpw', $configCache->get('database', 'password'));
+		self::assertEquals('testdb', $configCache->get('database', 'database'));
 
-		$this->assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
+		self::assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
 	}
 
 	/**
@@ -158,25 +158,25 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals('testhost', $configCache->get('database', 'hostname'));
-		$this->assertEquals('testuser', $configCache->get('database', 'username'));
-		$this->assertEquals('testpw', $configCache->get('database', 'password'));
-		$this->assertEquals('testdb', $configCache->get('database', 'database'));
-		$this->assertEquals('anotherCharset', $configCache->get('database', 'charset'));
+		self::assertEquals('testhost', $configCache->get('database', 'hostname'));
+		self::assertEquals('testuser', $configCache->get('database', 'username'));
+		self::assertEquals('testpw', $configCache->get('database', 'password'));
+		self::assertEquals('testdb', $configCache->get('database', 'database'));
+		self::assertEquals('anotherCharset', $configCache->get('database', 'charset'));
 
-		$this->assertEquals('/var/run/friendica.pid', $configCache->get('system', 'pidfile'));
-		$this->assertEquals('Europe/Berlin', $configCache->get('system', 'default_timezone'));
-		$this->assertEquals('fr', $configCache->get('system', 'language'));
+		self::assertEquals('/var/run/friendica.pid', $configCache->get('system', 'pidfile'));
+		self::assertEquals('Europe/Berlin', $configCache->get('system', 'default_timezone'));
+		self::assertEquals('fr', $configCache->get('system', 'language'));
 
-		$this->assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
-		$this->assertEquals('Friendly admin', $configCache->get('config', 'admin_nickname'));
+		self::assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
+		self::assertEquals('Friendly admin', $configCache->get('config', 'admin_nickname'));
 
-		$this->assertEquals('/another/php', $configCache->get('config', 'php_path'));
-		$this->assertEquals('999', $configCache->get('config', 'max_import_size'));
-		$this->assertEquals('666', $configCache->get('system', 'maximagesize'));
+		self::assertEquals('/another/php', $configCache->get('config', 'php_path'));
+		self::assertEquals('999', $configCache->get('config', 'max_import_size'));
+		self::assertEquals('666', $configCache->get('system', 'maximagesize'));
 
-		$this->assertEquals('quattro,vier,duepuntozero', $configCache->get('system', 'allowed_themes'));
-		$this->assertEquals('1', $configCache->get('system', 'no_regfullname'));
+		self::assertEquals('quattro,vier,duepuntozero', $configCache->get('system', 'allowed_themes'));
+		self::assertEquals('1', $configCache->get('system', 'no_regfullname'));
 	}
 
 	public function testLoadAddonConfig()
@@ -206,12 +206,12 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$conf = $configFileLoader->loadAddonConfig('test');
 
-		$this->assertEquals('testhost', $conf['database']['hostname']);
-		$this->assertEquals('testuser', $conf['database']['username']);
-		$this->assertEquals('testpw', $conf['database']['password']);
-		$this->assertEquals('testdb', $conf['database']['database']);
+		self::assertEquals('testhost', $conf['database']['hostname']);
+		self::assertEquals('testuser', $conf['database']['username']);
+		self::assertEquals('testpw', $conf['database']['password']);
+		self::assertEquals('testdb', $conf['database']['database']);
 
-		$this->assertEquals('admin@test.it', $conf['config']['admin_email']);
+		self::assertEquals('admin@test.it', $conf['config']['admin_email']);
 	}
 
 	/**
@@ -239,8 +239,8 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals('admin@overwritten.local', $configCache->get('config', 'admin_email'));
-		$this->assertEquals('newValue', $configCache->get('system', 'newKey'));
+		self::assertEquals('admin@overwritten.local', $configCache->get('config', 'admin_email'));
+		self::assertEquals('newValue', $configCache->get('system', 'newKey'));
 	}
 
 	/**
@@ -268,8 +268,8 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals('admin@overwritten.local', $configCache->get('config', 'admin_email'));
-		$this->assertEquals('newValue', $configCache->get('system', 'newKey'));
+		self::assertEquals('admin@overwritten.local', $configCache->get('config', 'admin_email'));
+		self::assertEquals('newValue', $configCache->get('system', 'newKey'));
 	}
 
 	/**
@@ -297,7 +297,7 @@ class ConfigFileLoaderTest extends MockedTest
 
 		$configFileLoader->setupCache($configCache);
 
-		$this->assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
-		$this->assertEmpty($configCache->get('system', 'NewKey'));
+		self::assertEquals('admin@test.it', $configCache->get('config', 'admin_email'));
+		self::assertEmpty($configCache->get('system', 'NewKey'));
 	}
 }
diff --git a/tests/src/Util/CryptoTest.php b/tests/src/Util/CryptoTest.php
index 6478c690ac..1a25e17195 100644
--- a/tests/src/Util/CryptoTest.php
+++ b/tests/src/Util/CryptoTest.php
@@ -35,23 +35,23 @@ class CryptoTest extends TestCase
 	{
 		global $phpMock;
 		$phpMock['random_int'] = function ($mMin, $mMax) use ($min, $max) {
-			$this->assertEquals($min, $mMin);
-			$this->assertEquals($max, $mMax);
+			self::assertEquals($min, $mMin);
+			self::assertEquals($max, $mMax);
 			return 1;
 		};
 	}
 
 	public function testRandomDigitsRandomInt()
 	{
-		$this->assertRandomInt(0, 9);
+		self::assertRandomInt(0, 9);
 
 		$test = Crypto::randomDigits(1);
-		$this->assertEquals(1, strlen($test));
-		$this->assertEquals(1, $test);
+		self::assertEquals(1, strlen($test));
+		self::assertEquals(1, $test);
 
 		$test = Crypto::randomDigits(8);
-		$this->assertEquals(8, strlen($test));
-		$this->assertEquals(11111111, $test);
+		self::assertEquals(8, strlen($test));
+		self::assertEquals(11111111, $test);
 	}
 
 	public function dataRsa()
@@ -69,7 +69,7 @@ class CryptoTest extends TestCase
 	 */
 	public function testPubRsaToMe(string $key, string $expected)
 	{
-		$this->assertEquals($expected, Crypto::rsaToPem(base64_decode($key)));
+		self::assertEquals($expected, Crypto::rsaToPem(base64_decode($key)));
 	}
 
 
@@ -95,7 +95,7 @@ class CryptoTest extends TestCase
 			'n' => new BigInteger($m, 256)
 		]);
 
-		$this->assertEquals($expectedRSA->getPublicKey(), $key);
+		self::assertEquals($expectedRSA->getPublicKey(), $key);
 	}
 
 	/**
@@ -107,7 +107,7 @@ class CryptoTest extends TestCase
 
 		$checkKey = Crypto::meToPem($m, $e);
 
-		$this->assertEquals($key, $checkKey);
+		self::assertEquals($key, $checkKey);
 	}
 }
 
diff --git a/tests/src/Util/DateTimeFormatTest.php b/tests/src/Util/DateTimeFormatTest.php
index 4e1a02a29b..333aa1cb1f 100644
--- a/tests/src/Util/DateTimeFormatTest.php
+++ b/tests/src/Util/DateTimeFormatTest.php
@@ -75,6 +75,6 @@ class DateTimeFormatTest extends MockedTest
 	{
 		$dtFormat = new DateTimeFormat();
 
-		$this->assertEquals($assert, $dtFormat->isYearMonth($input));
+		self::assertEquals($assert, $dtFormat->isYearMonth($input));
 	}
 }
diff --git a/tests/src/Util/EMailerTest.php b/tests/src/Util/EMailerTest.php
index 5c4cc87273..7c3b4b026b 100644
--- a/tests/src/Util/EMailerTest.php
+++ b/tests/src/Util/EMailerTest.php
@@ -81,21 +81,21 @@ class EMailerTest extends MockedTest
 
 		$emailer = new EmailerSpy($this->config, $this->pConfig, $this->baseUrl, new NullLogger(), $this->l10n);
 
-		$this->assertTrue($emailer->send($testEmail));
+		self::assertTrue($emailer->send($testEmail));
 
-		$this->assertContains("X-Friendica-Host: friendica.local", EmailerSpy::$MAIL_DATA['headers']);
-		$this->assertContains("X-Friendica-Platform: Friendica", EmailerSpy::$MAIL_DATA['headers']);
-		$this->assertContains("List-ID: <notification.friendica.local>", EmailerSpy::$MAIL_DATA['headers']);
-		$this->assertContains("List-Archive: <http://friendica.local/notifications/system>", EmailerSpy::$MAIL_DATA['headers']);
-		$this->assertContains("Reply-To: Sender <sender@friendica.local>", EmailerSpy::$MAIL_DATA['headers']);
-		$this->assertContains("MIME-Version: 1.0", EmailerSpy::$MAIL_DATA['headers']);
+		self::assertContains("X-Friendica-Host: friendica.local", EmailerSpy::$MAIL_DATA['headers']);
+		self::assertContains("X-Friendica-Platform: Friendica", EmailerSpy::$MAIL_DATA['headers']);
+		self::assertContains("List-ID: <notification.friendica.local>", EmailerSpy::$MAIL_DATA['headers']);
+		self::assertContains("List-Archive: <http://friendica.local/notifications/system>", EmailerSpy::$MAIL_DATA['headers']);
+		self::assertContains("Reply-To: Sender <sender@friendica.local>", EmailerSpy::$MAIL_DATA['headers']);
+		self::assertContains("MIME-Version: 1.0", EmailerSpy::$MAIL_DATA['headers']);
 		// Base64 "Test Text"
-		$this->assertContains(chunk_split(base64_encode('Test Text')), EmailerSpy::$MAIL_DATA['body']);
+		self::assertContains(chunk_split(base64_encode('Test Text')), EmailerSpy::$MAIL_DATA['body']);
 		// Base64 "Test Message<b>Bold</b>"
-		$this->assertContains(chunk_split(base64_encode("Test Message<b>Bold</b>")), EmailerSpy::$MAIL_DATA['body']);
-		$this->assertEquals("Test Subject", EmailerSpy::$MAIL_DATA['subject']);
-		$this->assertEquals("recipient@friendica.local", EmailerSpy::$MAIL_DATA['to']);
-		$this->assertEquals("-f sender@friendica.local", EmailerSpy::$MAIL_DATA['parameters']);
+		self::assertContains(chunk_split(base64_encode("Test Message<b>Bold</b>")), EmailerSpy::$MAIL_DATA['body']);
+		self::assertEquals("Test Subject", EmailerSpy::$MAIL_DATA['subject']);
+		self::assertEquals("recipient@friendica.local", EmailerSpy::$MAIL_DATA['to']);
+		self::assertEquals("-f sender@friendica.local", EmailerSpy::$MAIL_DATA['parameters']);
 	}
 
 	public function testTwoMessageIds()
@@ -124,10 +124,10 @@ class EMailerTest extends MockedTest
 		$emailer = new EmailerSpy($this->config, $this->pConfig, $this->baseUrl, new NullLogger(), $this->l10n);
 
 		// even in case there are two message ids, send the mail anyway
-		$this->assertTrue($emailer->send($testEmail));
+		self::assertTrue($emailer->send($testEmail));
 
 		// check case sensitive key problem
-		$this->assertArrayHasKey('Message-ID', $testEmail->getAdditionalMailHeader());
-		$this->assertArrayHasKey('Message-Id', $testEmail->getAdditionalMailHeader());
+		self::assertArrayHasKey('Message-ID', $testEmail->getAdditionalMailHeader());
+		self::assertArrayHasKey('Message-Id', $testEmail->getAdditionalMailHeader());
 	}
 }
diff --git a/tests/src/Util/Emailer/MailBuilderTest.php b/tests/src/Util/Emailer/MailBuilderTest.php
index b890224210..8287e76090 100644
--- a/tests/src/Util/Emailer/MailBuilderTest.php
+++ b/tests/src/Util/Emailer/MailBuilderTest.php
@@ -67,15 +67,15 @@ class MailBuilderTest extends MockedTest
 
 	public function assertEmail(IEmail $email, array $asserts)
 	{
-		$this->assertEquals($asserts['subject'] ?? $email->getSubject(), $email->getSubject());
-		$this->assertEquals($asserts['html'] ?? $email->getMessage(), $email->getMessage());
-		$this->assertEquals($asserts['text'] ?? $email->getMessage(true), $email->getMessage(true));
-		$this->assertEquals($asserts['toAddress'] ?? $email->getToAddress(), $email->getToAddress());
-		$this->assertEquals($asserts['fromAddress'] ?? $email->getFromAddress(), $email->getFromAddress());
-		$this->assertEquals($asserts['fromName'] ?? $email->getFromName(), $email->getFromName());
-		$this->assertEquals($asserts['replyTo'] ?? $email->getReplyTo(), $email->getReplyTo());
-		$this->assertEquals($asserts['uid'] ?? $email->getRecipientUid(), $email->getRecipientUid());
-		$this->assertEquals($asserts['header'] ?? $email->getAdditionalMailHeader(), $email->getAdditionalMailHeader());
+		self::assertEquals($asserts['subject'] ?? $email->getSubject(), $email->getSubject());
+		self::assertEquals($asserts['html'] ?? $email->getMessage(), $email->getMessage());
+		self::assertEquals($asserts['text'] ?? $email->getMessage(true), $email->getMessage(true));
+		self::assertEquals($asserts['toAddress'] ?? $email->getToAddress(), $email->getToAddress());
+		self::assertEquals($asserts['fromAddress'] ?? $email->getFromAddress(), $email->getFromAddress());
+		self::assertEquals($asserts['fromName'] ?? $email->getFromName(), $email->getFromName());
+		self::assertEquals($asserts['replyTo'] ?? $email->getReplyTo(), $email->getReplyTo());
+		self::assertEquals($asserts['uid'] ?? $email->getRecipientUid(), $email->getRecipientUid());
+		self::assertEquals($asserts['header'] ?? $email->getAdditionalMailHeader(), $email->getAdditionalMailHeader());
 	}
 
 	/**
@@ -85,7 +85,7 @@ class MailBuilderTest extends MockedTest
 	{
 		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
 
-		$this->assertInstanceOf(MailBuilder::class, $builder);
+		self::assertInstanceOf(MailBuilder::class, $builder);
 	}
 
 	/**
@@ -112,7 +112,7 @@ class MailBuilderTest extends MockedTest
 			->forUser(['uid' => 100])
 			->build(true);
 
-		$this->assertEmail($testEmail, [
+		self::assertEmail($testEmail, [
 			'subject' => 'Subject',
 			'html' => 'Html',
 			'text' => 'text',
@@ -165,7 +165,7 @@ class MailBuilderTest extends MockedTest
 			->withSender('Sender', 'sender@friendica.local')
 			->build(true);
 
-		$this->assertEmail($testEmail, [
+		self::assertEmail($testEmail, [
 			'toAddress' => 'recipient@friendica.local',
 			'fromName' => 'Sender',
 			'fromAddress' => 'sender@friendica.local',
@@ -186,7 +186,7 @@ class MailBuilderTest extends MockedTest
 			->withSender('Sender', 'sender@friendica.local')
 			->build(true);
 
-		$this->assertEmail($testEmail, [
+		self::assertEmail($testEmail, [
 			'toAddress' => 'recipient@friendica.local',
 			'fromName' => 'Sender',
 			'fromAddress' => 'sender@friendica.local',
diff --git a/tests/src/Util/Emailer/SystemMailBuilderTest.php b/tests/src/Util/Emailer/SystemMailBuilderTest.php
index 6991ce8d44..857369bdff 100644
--- a/tests/src/Util/Emailer/SystemMailBuilderTest.php
+++ b/tests/src/Util/Emailer/SystemMailBuilderTest.php
@@ -70,7 +70,7 @@ class SystemMailBuilderTest extends MockedTest
 	{
 		$builder = new SystemMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger(), 'moreply@friendica.local', 'FriendicaSite');
 
-		$this->assertInstanceOf(MailBuilder::class, $builder);
-		$this->assertInstanceOf(SystemMailBuilder::class, $builder);
+		self::assertInstanceOf(MailBuilder::class, $builder);
+		self::assertInstanceOf(SystemMailBuilder::class, $builder);
 	}
 }
diff --git a/tests/src/Util/HTTPSignatureTest.php b/tests/src/Util/HTTPSignatureTest.php
index ba2f6ebbf2..0458b7871c 100644
--- a/tests/src/Util/HTTPSignatureTest.php
+++ b/tests/src/Util/HTTPSignatureTest.php
@@ -43,7 +43,7 @@ class HTTPSignatureTest extends TestCase
            YWuxyvBa0Z6NdOb0di70cdrSDEsL5Gz7LBY5J2N9KdGg=="';
 
 		$headers = HTTPSignature::parseSigheader($header);
-		$this->assertSame([
+		self::assertSame([
 			'keyId'     => 'test-key-a',
 			'algorithm' => 'hs2019',
 			'created'   => '1402170695',
diff --git a/tests/src/Util/JsonLDTest.php b/tests/src/Util/JsonLDTest.php
index 94c7952b5c..2c922d3844 100644
--- a/tests/src/Util/JsonLDTest.php
+++ b/tests/src/Util/JsonLDTest.php
@@ -34,7 +34,7 @@ class JsonLDTest extends TestCase
 		$object = [];
 
 		$data = JsonLD::fetchElementArray($object, 'field');
-		$this->assertNull($data);
+		self::assertNull($data);
 	}
 
 	public function testFetchElementArrayFoundEmptyArray()
@@ -42,7 +42,7 @@ class JsonLDTest extends TestCase
 		$object = ['field' => []];
 
 		$data = JsonLD::fetchElementArray($object, 'field');
-		$this->assertSame([[]], $data);
+		self::assertSame([[]], $data);
 	}
 
 	public function testFetchElementArrayFoundID()
@@ -50,7 +50,7 @@ class JsonLDTest extends TestCase
 		$object = ['field' => ['value1', ['@id' => 'value2'], ['@id' => 'value3']]];
 
 		$data = JsonLD::fetchElementArray($object, 'field', '@id');
-		$this->assertSame(['value1', 'value2', 'value3'], $data);
+		self::assertSame(['value1', 'value2', 'value3'], $data);
 	}
 
 	public function testFetchElementArrayFoundID2()
@@ -60,7 +60,7 @@ class JsonLDTest extends TestCase
 			'value3', ['@id' => 'value4', 'subfield42' => 'value42']]];
 
 		$data = JsonLD::fetchElementArray($object, 'field', '@id');
-		$this->assertSame(['value3', 'value4'], $data);
+		self::assertSame(['value3', 'value4'], $data);
 	}
 	public function testFetchElementArrayFoundArrays()
 	{
@@ -71,7 +71,7 @@ class JsonLDTest extends TestCase
 			['subfield21' => 'value21', 'subfield22' => 'value22']];
 
 		$data = JsonLD::fetchElementArray($object, 'field');
-		$this->assertSame($expect, $data);
+		self::assertSame($expect, $data);
 	}
 
 	public function testFetchElementNotFound()
@@ -79,7 +79,7 @@ class JsonLDTest extends TestCase
 		$object = [];
 
 		$data = JsonLD::fetchElement($object, 'field');
-		$this->assertNull($data);
+		self::assertNull($data);
 	}
 
 	public function testFetchElementFound()
@@ -87,7 +87,7 @@ class JsonLDTest extends TestCase
 		$object = ['field' => 'value'];
 
 		$data = JsonLD::fetchElement($object, 'field');
-		$this->assertSame('value', $data);
+		self::assertSame('value', $data);
 	}
 
 	public function testFetchElementFoundEmptyString()
@@ -95,7 +95,7 @@ class JsonLDTest extends TestCase
 		$object = ['field' => ''];
 
 		$data = JsonLD::fetchElement($object, 'field');
-		$this->assertSame('', $data);
+		self::assertSame('', $data);
 	}
 
 	public function testFetchElementKeyFoundEmptyArray()
@@ -103,7 +103,7 @@ class JsonLDTest extends TestCase
 		$object = ['field' => ['content' => []]];
 
 		$data = JsonLD::fetchElement($object, 'field', 'content');
-		$this->assertSame([], $data);
+		self::assertSame([], $data);
 	}
 
 	public function testFetchElementFoundID()
@@ -111,7 +111,7 @@ class JsonLDTest extends TestCase
 		$object = ['field' => ['field2' => 'value2', '@id' => 'value', 'field3' => 'value3']];
 
 		$data = JsonLD::fetchElement($object, 'field');
-		$this->assertSame('value', $data);
+		self::assertSame('value', $data);
 	}
 
 	public function testFetchElementType()
@@ -119,7 +119,7 @@ class JsonLDTest extends TestCase
 		$object = ['source' => ['content' => 'body', 'mediaType' => 'text/bbcode']];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content', 'mediaType', 'text/bbcode');
-		$this->assertSame('body', $data);
+		self::assertSame('body', $data);
 	}
 
 	public function testFetchElementTypeValueNotFound()
@@ -127,7 +127,7 @@ class JsonLDTest extends TestCase
 		$object = ['source' => ['content' => 'body', 'mediaType' => 'text/html']];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content', 'mediaType', 'text/bbcode');
-		$this->assertNull($data);
+		self::assertNull($data);
 	}
 
 	public function testFetchElementTypeNotFound()
@@ -135,7 +135,7 @@ class JsonLDTest extends TestCase
 		$object = ['source' => ['content' => 'body', 'mediaType' => 'text/html']];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content', 'mediaType2', 'text/html');
-		$this->assertNull($data);
+		self::assertNull($data);
 	}
 
 	public function testFetchElementKeyWithoutType()
@@ -143,7 +143,7 @@ class JsonLDTest extends TestCase
 		$object = ['source' => ['content' => 'body', 'mediaType' => 'text/bbcode']];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content');
-		$this->assertSame('body', $data);
+		self::assertSame('body', $data);
 	}
 
 	public function testFetchElementTypeArray()
@@ -152,7 +152,7 @@ class JsonLDTest extends TestCase
 			['content' => 'body', 'mediaType' => 'text/bbcode']]];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content', 'mediaType', 'text/bbcode');
-		$this->assertSame('body', $data);
+		self::assertSame('body', $data);
 	}
 
 	public function testFetchElementTypeValueArrayNotFound()
@@ -161,7 +161,7 @@ class JsonLDTest extends TestCase
 			['content' => 'body', 'mediaType' => 'text/bbcode']]];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content', 'mediaType', 'text/markdown');
-		$this->assertNull($data);
+		self::assertNull($data);
 	}
 
 	public function testFetchElementTypeArrayNotFound()
@@ -170,6 +170,6 @@ class JsonLDTest extends TestCase
 			['content' => 'body', 'mediaType' => 'text/bbcode']]];
 
 		$data = JsonLD::fetchElement($object, 'source', 'content', 'mediaType2', 'text/bbcode');
-		$this->assertNull($data);
+		self::assertNull($data);
 	}
 }
diff --git a/tests/src/Util/Logger/AbstractLoggerTest.php b/tests/src/Util/Logger/AbstractLoggerTest.php
index 2cac6ce717..33bf235616 100644
--- a/tests/src/Util/Logger/AbstractLoggerTest.php
+++ b/tests/src/Util/Logger/AbstractLoggerTest.php
@@ -72,12 +72,12 @@ abstract class AbstractLoggerTest extends MockedTest
 
 	public function assertLogline($string)
 	{
-		$this->assertRegExp(self::LOGLINE, $string);
+		self::assertRegExp(self::LOGLINE, $string);
 	}
 
 	public function assertLoglineNums($assertNum, $string)
 	{
-		$this->assertEquals($assertNum, preg_match_all(self::LOGLINE, $string));
+		self::assertEquals($assertNum, preg_match_all(self::LOGLINE, $string));
 	}
 
 	/**
@@ -92,8 +92,8 @@ abstract class AbstractLoggerTest extends MockedTest
 		$logger->notice('message', ['an' => 'context']);
 
 		$text = $this->getContent();
-		$this->assertLogline($text);
-		$this->assertLoglineNums(4, $text);
+		self::assertLogline($text);
+		self::assertLoglineNums(4, $text);
 	}
 
 	/**
@@ -106,8 +106,8 @@ abstract class AbstractLoggerTest extends MockedTest
 		$logger->emergency('A {psr} test', ['psr' => 'working']);
 		$logger->alert('An {array} test', ['array' => ['it', 'is', 'working']]);
 		$text = $this->getContent();
-		$this->assertContains('A working test', $text);
-		$this->assertContains('An ["it","is","working"] test', $text);
+		self::assertContains('A working test', $text);
+		self::assertContains('An ["it","is","working"] test', $text);
 	}
 
 	/**
@@ -119,9 +119,9 @@ abstract class AbstractLoggerTest extends MockedTest
 		$logger->emergency('A test');
 
 		$text = $this->getContent();
-		$this->assertContains('"file":"' . self::FILE . '"', $text);
-		$this->assertContains('"line":' . self::LINE, $text);
-		$this->assertContains('"function":"' . self::FUNC . '"', $text);
+		self::assertContains('"file":"' . self::FILE . '"', $text);
+		self::assertContains('"line":' . self::LINE, $text);
+		self::assertContains('"function":"' . self::FUNC . '"', $text);
 	}
 
 	/**
@@ -141,7 +141,7 @@ abstract class AbstractLoggerTest extends MockedTest
 
 		$text = $this->getContent();
 
-		$this->assertLoglineNums(5, $text);
+		self::assertLoglineNums(5, $text);
 	}
 
 	/**
@@ -155,8 +155,8 @@ abstract class AbstractLoggerTest extends MockedTest
 
 		$text = $this->getContent();
 
-		$this->assertLogline($text);
+		self::assertLogline($text);
 
-		$this->assertContains(@json_encode($context), $text);
+		self::assertContains(@json_encode($context), $text);
 	}
 }
diff --git a/tests/src/Util/Logger/StreamLoggerTest.php b/tests/src/Util/Logger/StreamLoggerTest.php
index f507634f0e..2e2aac2f1b 100644
--- a/tests/src/Util/Logger/StreamLoggerTest.php
+++ b/tests/src/Util/Logger/StreamLoggerTest.php
@@ -92,7 +92,7 @@ class StreamLoggerTest extends AbstractLoggerTest
 
 		$text = $logfile->getContent();
 
-		$this->assertLogline($text);
+		self::assertLogline($text);
 	}
 
 	/**
@@ -111,7 +111,7 @@ class StreamLoggerTest extends AbstractLoggerTest
 
 		$text = $logfile->getContent();
 
-		$this->assertLoglineNums(2, $text);
+		self::assertLoglineNums(2, $text);
 	}
 
 	/**
diff --git a/tests/src/Util/Logger/WorkerLoggerTest.php b/tests/src/Util/Logger/WorkerLoggerTest.php
index d63e5eda5c..b110677de1 100644
--- a/tests/src/Util/Logger/WorkerLoggerTest.php
+++ b/tests/src/Util/Logger/WorkerLoggerTest.php
@@ -29,7 +29,7 @@ class WorkerLoggerTest extends MockedTest
 {
 	private function assertUid($uid, $length = 7)
 	{
-		$this->assertRegExp('/^[a-zA-Z0-9]{' . $length . '}+$/', $uid);
+		self::assertRegExp('/^[a-zA-Z0-9]{' . $length . '}+$/', $uid);
 	}
 
 	/**
@@ -51,7 +51,7 @@ class WorkerLoggerTest extends MockedTest
 		for ($i = 1; $i < 14; $i++) {
 			$workLogger = new WorkerLogger($logger, 'test', $i);
 			$uid = $workLogger->getWorkerId();
-			$this->assertUid($uid, $i);
+			self::assertUid($uid, $i);
 		}
 	}
 
@@ -107,7 +107,7 @@ class WorkerLoggerTest extends MockedTest
 		$testContext = $context;
 		$testContext['worker_id'] = $workLogger->getWorkerId();
 		$testContext['worker_cmd'] = 'test';
-		$this->assertUid($testContext['worker_id']);
+		self::assertUid($testContext['worker_id']);
 		$logger
 			->shouldReceive($func)
 			->with($msg, $testContext)
@@ -125,7 +125,7 @@ class WorkerLoggerTest extends MockedTest
 		$context = $testContext = ['test' => 'it'];
 		$testContext['worker_id'] = $workLogger->getWorkerId();
 		$testContext['worker_cmd'] = 'test';
-		$this->assertUid($testContext['worker_id']);
+		self::assertUid($testContext['worker_id']);
 		$logger
 			->shouldReceive('log')
 			->with('debug', 'a test', $testContext)
diff --git a/tests/src/Util/ProfilerTest.php b/tests/src/Util/ProfilerTest.php
index 30e60b209b..45b29943f5 100644
--- a/tests/src/Util/ProfilerTest.php
+++ b/tests/src/Util/ProfilerTest.php
@@ -134,7 +134,7 @@ class ProfilerTest extends MockedTest
 			$profiler->saveTimestamp($timestamp, $name, $function);
 		}
 
-		$this->assertGreaterThanOrEqual(0, $profiler->get($name));
+		self::assertGreaterThanOrEqual(0, $profiler->get($name));
 	}
 
 	/**
@@ -154,7 +154,7 @@ class ProfilerTest extends MockedTest
 		$profiler->saveTimestamp($timestamp, $name);
 		$profiler->reset();
 
-		$this->assertEquals(0, $profiler->get($name));
+		self::assertEquals(0, $profiler->get($name));
 	}
 
 	public function dataBig()
@@ -227,7 +227,7 @@ class ProfilerTest extends MockedTest
 		foreach ($data as $perf => $items) {
 			foreach ($items['functions'] as $function) {
 				// assert that the output contains the functions
-				$this->assertRegExp('/' . $function . ': \d+/', $output);
+				self::assertRegExp('/' . $function . ': \d+/', $output);
 			}
 		}
 	}
@@ -249,8 +249,8 @@ class ProfilerTest extends MockedTest
 
 		$profiler = new Profiler($configCache);
 
-		$this->assertFalse($profiler->isRendertime());
-		$this->assertEmpty($profiler->getRendertimeString());
+		self::assertFalse($profiler->isRendertime());
+		self::assertEmpty($profiler->getRendertimeString());
 
 		$profiler->saveTimestamp(time(), 'network', 'test1');
 
@@ -266,8 +266,8 @@ class ProfilerTest extends MockedTest
 
 		$profiler->update($config);
 
-		$this->assertFalse($profiler->isRendertime());
-		$this->assertEmpty($profiler->getRendertimeString());
+		self::assertFalse($profiler->isRendertime());
+		self::assertEmpty($profiler->getRendertimeString());
 
 		$config->shouldReceive('get')
 		       ->with('system', 'profiler')
@@ -282,9 +282,9 @@ class ProfilerTest extends MockedTest
 
 		$profiler->saveTimestamp(time(), 'database', 'test2');
 
-		$this->assertTrue($profiler->isRendertime());
+		self::assertTrue($profiler->isRendertime());
 		$output = $profiler->getRendertimeString();
-		$this->assertRegExp('/test1: \d+/', $output);
-		$this->assertRegExp('/test2: \d+/', $output);
+		self::assertRegExp('/test1: \d+/', $output);
+		self::assertRegExp('/test2: \d+/', $output);
 	}
 }
diff --git a/tests/src/Util/StringsTest.php b/tests/src/Util/StringsTest.php
index 611d72fe7c..86b55a2fe3 100644
--- a/tests/src/Util/StringsTest.php
+++ b/tests/src/Util/StringsTest.php
@@ -37,7 +37,7 @@ class StringsTest extends TestCase
 		$randomname1 = Strings::getRandomName(10);
 		$randomname2 = Strings::getRandomName(10);
 
-		$this->assertNotEquals($randomname1, $randomname2);
+		self::assertNotEquals($randomname1, $randomname2);
 	}
 
 	/**
@@ -48,7 +48,7 @@ class StringsTest extends TestCase
 		$randomname1 = Strings::getRandomName(9);
 		$randomname2 = Strings::getRandomName(9);
 
-		$this->assertNotEquals($randomname1, $randomname2);
+		self::assertNotEquals($randomname1, $randomname2);
 	}
 
 	/**
@@ -57,7 +57,7 @@ class StringsTest extends TestCase
 	public function testRandomNameNoLength()
 	{
 		$randomname1 = Strings::getRandomName(0);
-		$this->assertEquals(0, strlen($randomname1));
+		self::assertEquals(0, strlen($randomname1));
 	}
 
 	/**
@@ -68,7 +68,7 @@ class StringsTest extends TestCase
 	public function testRandomNameNegativeLength()
 	{
 		$randomname1 = Strings::getRandomName(-23);
-		$this->assertEquals(0, strlen($randomname1));
+		self::assertEquals(0, strlen($randomname1));
 	}
 
 	/**
@@ -77,10 +77,10 @@ class StringsTest extends TestCase
 	public function testRandomNameLength1()
 	{
 		$randomname1 = Strings::getRandomName(1);
-		$this->assertEquals(1, strlen($randomname1));
+		self::assertEquals(1, strlen($randomname1));
 
 		$randomname2 = Strings::getRandomName(1);
-		$this->assertEquals(1, strlen($randomname2));
+		self::assertEquals(1, strlen($randomname2));
 	}
 
 	/**
@@ -93,8 +93,8 @@ class StringsTest extends TestCase
 		$validstring = Strings::escapeTags($invalidstring);
 		$escapedString = Strings::escapeHtml($invalidstring);
 
-		$this->assertEquals('[submit type="button" onclick="alert(\'failed!\');" /]', $validstring);
-		$this->assertEquals(
+		self::assertEquals('[submit type="button" onclick="alert(\'failed!\');" /]', $validstring);
+		self::assertEquals(
 			"&lt;submit type=&quot;button&quot; onclick=&quot;alert('failed!');&quot; /&gt;",
 			$escapedString
 		);
@@ -132,7 +132,7 @@ class StringsTest extends TestCase
 	 */
 	public function testIsHex($input, $valid)
 	{
-		$this->assertEquals($valid, Strings::isHex($input));
+		self::assertEquals($valid, Strings::isHex($input));
 	}
 
 	/**
@@ -142,13 +142,13 @@ class StringsTest extends TestCase
 	public function testSubstringReplaceASCII()
 	{
 		for ($start = -10; $start <= 10; $start += 5) {
-			$this->assertEquals(
+			self::assertEquals(
 				substr_replace('string', 'replacement', $start),
 				Strings::substringReplace('string', 'replacement', $start)
 			);
 
 			for ($length = -10; $length <= 10; $length += 5) {
-				$this->assertEquals(
+				self::assertEquals(
 					substr_replace('string', 'replacement', $start, $length),
 					Strings::substringReplace('string', 'replacement', $start, $length)
 				);
@@ -184,7 +184,7 @@ class StringsTest extends TestCase
 	 */
 	public function testSubstringReplaceMultiByte(string $expected, string $string, string $replacement, int $start, int $length = null)
 	{
-		$this->assertEquals(
+		self::assertEquals(
 			$expected,
 			Strings::substringReplace(
 				$string,
@@ -203,7 +203,7 @@ class StringsTest extends TestCase
 			return $text;
 		});
 
-		$this->assertEquals($originalText, $text);
+		self::assertEquals($originalText, $text);
 	}
 
 	public function testPerformWithEscapedBlocksNested()
@@ -218,6 +218,6 @@ class StringsTest extends TestCase
 			return $text;
 		});
 
-		$this->assertEquals($originalText, $text);
+		self::assertEquals($originalText, $text);
 	}
 }
diff --git a/tests/src/Util/XmlTest.php b/tests/src/Util/XmlTest.php
index 16c27836d4..99b58a0b87 100644
--- a/tests/src/Util/XmlTest.php
+++ b/tests/src/Util/XmlTest.php
@@ -37,7 +37,7 @@ class XmlTest extends TestCase
 		$text="<tag>I want to break\n this!11!<?hard?></tag>";
 		$xml=XML::escape($text);
 		$retext=XML::unescape($text);
-		$this->assertEquals($text, $retext);
+		self::assertEquals($text, $retext);
     }
     
 	/**
@@ -52,12 +52,12 @@ class XmlTest extends TestCase
 		//should be possible to parse it
 		$values=array();
 		$index=array();
-		$this->assertEquals(1, xml_parse_into_struct($xml_parser, $text, $values, $index));
-		$this->assertEquals(
+		self::assertEquals(1, xml_parse_into_struct($xml_parser, $text, $values, $index));
+		self::assertEquals(
 			array('TEXT'=>array(0)),
 			$index
 		);
-		$this->assertEquals(
+		self::assertEquals(
 			array(array('tag'=>'TEXT', 'type'=>'complete', 'level'=>1, 'value'=>$tag)),
 			$values
 		);