Enable testability for HTTPInputData and create a failing test for it :-)

src/Util/HTTPInputData.php

@@ -58,7 +58,7 @@ class HTTPInputData
 		}
 
 		// can be handled by built in PHP functionality
-		$content = file_get_contents('php://input');
+		$content = static::getPhpInputContent();
 
 		$variables = json_decode($content);
 
@@ -73,7 +73,7 @@ class HTTPInputData
 	{
 		$result = ['variables' => [], 'files' => []];
 
-		$stream = fopen('php://input', 'rb');
+		$stream = static::getPhpInputStream();
 
 		$sanity = fgets($stream, strlen($boundary) + 5);
 
@@ -259,4 +259,24 @@ class HTTPInputData
 
 		return $variables;
 	}
+
+	/**
+	 * Returns the current PHP input stream
+	 * Mainly used for test doubling
+	 * @return false|resource
+	 */
+	protected static function getPhpInputStream()
+	{
+		return fopen('php://input', 'rb');
+	}
+
+	/**
+	 * Returns the content of tje current PHP input
+	 * Mainly used for test doubling
+	 * @return false|string
+	 */
+	protected static function getPhpInputContent()
+	{
+		return file_get_contents('php://input');
+	}
 }

tests/Util/HTTPInputDataDouble.php

@@ -0,0 +1,66 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Test\Util;
+
+use Friendica\Util\HTTPInputData;
+
+/**
+ * This class is used to enable testability for HTTPInputData
+ * It overrides the two PHP input functionality with custom content
+ */
+class HTTPInputDataDouble extends HTTPInputData
+{
+	/** @var false|resource */
+	protected static $injectedStream = false;
+	/** @var false|string */
+	protected static $injectedContent = false;
+
+	/**
+	 * injects the PHP input stream for a test
+	 * @param false|resource $stream
+	 */
+	public static function setPhpInputStream($stream)
+	{
+		self::$injectedStream = $stream;
+	}
+
+	/**
+	 * injects the PHP input content for a test
+	 * @param false|string $content
+	 */
+	public static function setPhpInputContent($content)
+	{
+		self::$injectedContent = $content;
+	}
+
+	/** {@inheritDoc} */
+	protected static function getPhpInputStream()
+	{
+		return static::$injectedStream;
+	}
+
+	/** {@inheritDoc} */
+	protected static function getPhpInputContent()
+	{
+		return static::$injectedContent;
+	}
+}

tests/src/Util/HTTPInputDataTest.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Test\src\Util;
+
+use Friendica\Test\MockedTest;
+use Friendica\Test\Util\HTTPInputDataDouble;
+use Friendica\Util\HTTPInputData;
+
+/**
+ * Testing HTTPInputData
+ * @see	HTTPInputData
+ */
+class HTTPInputDataTest extends MockedTest
+{
+	/**
+	 * Returns the data stream for the unit test
+	 * Each array element of the first hierarchy represents one test run
+	 * Each array element of the second hierarchy represents the parameters, passed to the test function
+	 * @return array[]
+	 */
+	public function dataStream()
+	{
+		return [
+			'example' => [
+				'input'    => 'anything you want',
+				'expected' => [
+					'variables' => [
+						'var1' => 'value',
+						'var2' => 'value',
+					],
+					'files' => []
+				]
+			]
+		];
+	}
+
+	/**
+	 * Tests the HTTPInputData::process() method
+	 * @see HTTPInputData::process()
+	 * @param string $input The input, we got from the data stream
+	 * @param array  $expected The expected output
+	 * @dataProvider dataStream
+	 */
+	public function testHttpInput(string $input, array $expected)
+	{
+		HTTPInputDataDouble::setPhpInputContent($input);
+		$stream = fopen('php://memory', 'r+');
+		fwrite($stream, $input);
+		rewind($stream);
+
+		HTTPInputDataDouble::setPhpInputStream($stream);
+		$output = HTTPInputDataDouble::process();
+		$this->assertEqualsCanonicalizing($output, $expected);
+	}
+}