Changing Friendica\App\Mode from static methods to public methods

- Changing from static methods to public methods
- Adding dev-composer-dependency Mockery for static method mocking (f.e. Config, DBA)
- Adding ModeTest with Mocking
- removing bootstrap from phpunit.xml because of double loading tests\bootstrap.php

tests/Util/VFSTrait.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Friendica\Test\Util;
+
+
+use org\bovigo\vfs\vfsStream;
+use org\bovigo\vfs\vfsStreamDirectory;
+
+trait VFSTrait
+{
+	/**
+	 * @var vfsStreamDirectory The Stream Directory
+	 */
+	protected $root;
+
+	protected function setUpVfsDir() {
+		// the used directories inside the App class
+		$structure = [
+			'config' => [],
+			'bin' => []
+		];
+
+		// create a virtual directory and copy all needed files and folders to it
+		$this->root = vfsStream::setup('friendica', null, $structure);
+
+		$this->setConfigFile('config.ini.php');
+		$this->setConfigFile('settings.ini.php');
+		$this->setConfigFile('local.ini.php');
+		$this->setConfigFile('dbstructure.json');
+	}
+
+	protected function setConfigFile($filename)
+	{
+		$file = dirname(__DIR__) . DIRECTORY_SEPARATOR .
+			'..' . DIRECTORY_SEPARATOR .
+			'config' . DIRECTORY_SEPARATOR .
+			$filename;
+
+		if (file_exists($file)) {
+			vfsStream::newFile($filename)
+				->at($this->root->getChild('config'))
+				->setContent(file_get_contents($file));
+		}
+	}
+
+	protected function delConfigFile($filename)
+	{
+		if ($this->root->hasChild('config/' . $filename)) {
+			$this->root->removeChild('config/' . $filename);
+		}
+	}
+}