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diff --git a/tests/phpunit/MediaWikiTestCase.php b/tests/phpunit/MediaWikiTestCase.php
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+<?php
+
+/**
+ * @since 1.18
+ */
+abstract class MediaWikiTestCase extends PHPUnit_Framework_TestCase {
+	/**
+	 * $called tracks whether the setUp and tearDown method has been called.
+	 * class extending MediaWikiTestCase usually override setUp and tearDown
+	 * but forget to call the parent.
+	 *
+	 * The array format takes a method name as key and anything as a value.
+	 * By asserting the key exist, we know the child class has called the
+	 * parent.
+	 *
+	 * This property must be private, we do not want child to override it,
+	 * they should call the appropriate parent method instead.
+	 */
+	private $called = array();
+
+	/**
+	 * @var TestUser[]
+	 * @since 1.20
+	 */
+	public static $users;
+
+	/**
+	 * @var DatabaseBase
+	 * @since 1.18
+	 */
+	protected $db;
+
+	/**
+	 * @var array
+	 * @since 1.19
+	 */
+	protected $tablesUsed = array(); // tables with data
+
+	private static $useTemporaryTables = true;
+	private static $reuseDB = false;
+	private static $dbSetup = false;
+	private static $oldTablePrefix = false;
+
+	/**
+	 * Original value of PHP's error_reporting setting.
+	 *
+	 * @var int
+	 */
+	private $phpErrorLevel;
+
+	/**
+	 * Holds the paths of temporary files/directories created through getNewTempFile,
+	 * and getNewTempDirectory
+	 *
+	 * @var array
+	 */
+	private $tmpFiles = array();
+
+	/**
+	 * Holds original values of MediaWiki configuration settings
+	 * to be restored in tearDown().
+	 * See also setMwGlobals().
+	 * @var array
+	 */
+	private $mwGlobals = array();
+
+	/**
+	 * Table name prefixes. Oracle likes it shorter.
+	 */
+	const DB_PREFIX = 'unittest_';
+	const ORA_DB_PREFIX = 'ut_';
+
+	/**
+	 * @var array
+	 * @since 1.18
+	 */
+	protected $supportedDBs = array(
+		'mysql',
+		'sqlite',
+		'postgres',
+		'oracle'
+	);
+
+	public function __construct( $name = null, array $data = array(), $dataName = '' ) {
+		parent::__construct( $name, $data, $dataName );
+
+		$this->backupGlobals = false;
+		$this->backupStaticAttributes = false;
+	}
+
+	public function __destruct() {
+		// Complain if self::setUp() was called, but not self::tearDown()
+		// $this->called['setUp'] will be checked by self::testMediaWikiTestCaseParentSetupCalled()
+		if ( isset( $this->called['setUp'] ) && !isset( $this->called['tearDown'] ) ) {
+			throw new MWException( get_called_class() . "::tearDown() must call parent::tearDown()" );
+		}
+	}
+
+	public function run( PHPUnit_Framework_TestResult $result = null ) {
+		/* Some functions require some kind of caching, and will end up using the db,
+		 * which we can't allow, as that would open a new connection for mysql.
+		 * Replace with a HashBag. They would not be going to persist anyway.
+		 */
+		ObjectCache::$instances[CACHE_DB] = new HashBagOStuff;
+
+		$needsResetDB = false;
+		$logName = get_class( $this ) . '::' . $this->getName( false );
+
+		if ( $this->needsDB() ) {
+			// set up a DB connection for this test to use
+
+			self::$useTemporaryTables = !$this->getCliArg( 'use-normal-tables' );
+			self::$reuseDB = $this->getCliArg( 'reuse-db' );
+
+			$this->db = wfGetDB( DB_MASTER );
+
+			$this->checkDbIsSupported();
+
+			if ( !self::$dbSetup ) {
+				wfProfileIn( $logName . ' (clone-db)' );
+
+				// switch to a temporary clone of the database
+				self::setupTestDB( $this->db, $this->dbPrefix() );
+
+				if ( ( $this->db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
+					$this->resetDB();
+				}
+
+				wfProfileOut( $logName . ' (clone-db)' );
+			}
+
+			wfProfileIn( $logName . ' (prepare-db)' );
+			$this->addCoreDBData();
+			$this->addDBData();
+			wfProfileOut( $logName . ' (prepare-db)' );
+
+			$needsResetDB = true;
+		}
+
+		wfProfileIn( $logName );
+		parent::run( $result );
+		wfProfileOut( $logName );
+
+		if ( $needsResetDB ) {
+			wfProfileIn( $logName . ' (reset-db)' );
+			$this->resetDB();
+			wfProfileOut( $logName . ' (reset-db)' );
+		}
+	}
+
+	/**
+	 * @since 1.21
+	 *
+	 * @return bool
+	 */
+	public function usesTemporaryTables() {
+		return self::$useTemporaryTables;
+	}
+
+	/**
+	 * Obtains a new temporary file name
+	 *
+	 * The obtained filename is enlisted to be removed upon tearDown
+	 *
+	 * @since 1.20
+	 *
+	 * @return string Absolute name of the temporary file
+	 */
+	protected function getNewTempFile() {
+		$fileName = tempnam( wfTempDir(), 'MW_PHPUnit_' . get_class( $this ) . '_' );
+		$this->tmpFiles[] = $fileName;
+
+		return $fileName;
+	}
+
+	/**
+	 * obtains a new temporary directory
+	 *
+	 * The obtained directory is enlisted to be removed (recursively with all its contained
+	 * files) upon tearDown.
+	 *
+	 * @since 1.20
+	 *
+	 * @return string Absolute name of the temporary directory
+	 */
+	protected function getNewTempDirectory() {
+		// Starting of with a temporary /file/.
+		$fileName = $this->getNewTempFile();
+
+		// Converting the temporary /file/ to a /directory/
+		//
+		// The following is not atomic, but at least we now have a single place,
+		// where temporary directory creation is bundled and can be improved
+		unlink( $fileName );
+		$this->assertTrue( wfMkdirParents( $fileName ) );
+
+		return $fileName;
+	}
+
+	protected function setUp() {
+		wfProfileIn( __METHOD__ );
+		parent::setUp();
+		$this->called['setUp'] = true;
+
+		$this->phpErrorLevel = intval( ini_get( 'error_reporting' ) );
+
+		// Cleaning up temporary files
+		foreach ( $this->tmpFiles as $fileName ) {
+			if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
+				unlink( $fileName );
+			} elseif ( is_dir( $fileName ) ) {
+				wfRecursiveRemoveDir( $fileName );
+			}
+		}
+
+		if ( $this->needsDB() && $this->db ) {
+			// Clean up open transactions
+			while ( $this->db->trxLevel() > 0 ) {
+				$this->db->rollback();
+			}
+
+			// don't ignore DB errors
+			$this->db->ignoreErrors( false );
+		}
+
+		wfProfileOut( __METHOD__ );
+	}
+
+	protected function tearDown() {
+		wfProfileIn( __METHOD__ );
+
+		$this->called['tearDown'] = true;
+		// Cleaning up temporary files
+		foreach ( $this->tmpFiles as $fileName ) {
+			if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
+				unlink( $fileName );
+			} elseif ( is_dir( $fileName ) ) {
+				wfRecursiveRemoveDir( $fileName );
+			}
+		}
+
+		if ( $this->needsDB() && $this->db ) {
+			// Clean up open transactions
+			while ( $this->db->trxLevel() > 0 ) {
+				$this->db->rollback();
+			}
+
+			// don't ignore DB errors
+			$this->db->ignoreErrors( false );
+		}
+
+		// Restore mw globals
+		foreach ( $this->mwGlobals as $key => $value ) {
+			$GLOBALS[$key] = $value;
+		}
+		$this->mwGlobals = array();
+		RequestContext::resetMain();
+		MediaHandler::resetCache();
+
+		$phpErrorLevel = intval( ini_get( 'error_reporting' ) );
+
+		if ( $phpErrorLevel !== $this->phpErrorLevel ) {
+			ini_set( 'error_reporting', $this->phpErrorLevel );
+
+			$oldHex = strtoupper( dechex( $this->phpErrorLevel ) );
+			$newHex = strtoupper( dechex( $phpErrorLevel ) );
+			$message = "PHP error_reporting setting was left dirty: "
+				. "was 0x$oldHex before test, 0x$newHex after test!";
+
+			$this->fail( $message );
+		}
+
+		parent::tearDown();
+		wfProfileOut( __METHOD__ );
+	}
+
+	/**
+	 * Make sure MediaWikiTestCase extending classes have called their
+	 * parent setUp method
+	 */
+	final public function testMediaWikiTestCaseParentSetupCalled() {
+		$this->assertArrayHasKey( 'setUp', $this->called,
+			get_called_class() . "::setUp() must call parent::setUp()"
+		);
+	}
+
+	/**
+	 * Sets a global, maintaining a stashed version of the previous global to be
+	 * restored in tearDown
+	 *
+	 * The key is added to the array of globals that will be reset afterwards
+	 * in the tearDown().
+	 *
+	 * @example
+	 * <code>
+	 *     protected function setUp() {
+	 *         $this->setMwGlobals( 'wgRestrictStuff', true );
+	 *     }
+	 *
+	 *     function testFoo() {}
+	 *
+	 *     function testBar() {}
+	 *         $this->assertTrue( self::getX()->doStuff() );
+	 *
+	 *         $this->setMwGlobals( 'wgRestrictStuff', false );
+	 *         $this->assertTrue( self::getX()->doStuff() );
+	 *     }
+	 *
+	 *     function testQuux() {}
+	 * </code>
+	 *
+	 * @param array|string $pairs Key to the global variable, or an array
+	 *  of key/value pairs.
+	 * @param mixed $value Value to set the global to (ignored
+	 *  if an array is given as first argument).
+	 *
+	 * @since 1.21
+	 */
+	protected function setMwGlobals( $pairs, $value = null ) {
+		if ( is_string( $pairs ) ) {
+			$pairs = array( $pairs => $value );
+		}
+
+		$this->stashMwGlobals( array_keys( $pairs ) );
+
+		foreach ( $pairs as $key => $value ) {
+			$GLOBALS[$key] = $value;
+		}
+	}
+
+	/**
+	 * Stashes the global, will be restored in tearDown()
+	 *
+	 * Individual test functions may override globals through the setMwGlobals() function
+	 * or directly. When directly overriding globals their keys should first be passed to this
+	 * method in setUp to avoid breaking global state for other tests
+	 *
+	 * That way all other tests are executed with the same settings (instead of using the
+	 * unreliable local settings for most tests and fix it only for some tests).
+	 *
+	 * @param array|string $globalKeys Key to the global variable, or an array of keys.
+	 *
+	 * @throws Exception When trying to stash an unset global
+	 * @since 1.23
+	 */
+	protected function stashMwGlobals( $globalKeys ) {
+		if ( is_string( $globalKeys ) ) {
+			$globalKeys = array( $globalKeys );
+		}
+
+		foreach ( $globalKeys as $globalKey ) {
+			// NOTE: make sure we only save the global once or a second call to
+			// setMwGlobals() on the same global would override the original
+			// value.
+			if ( !array_key_exists( $globalKey, $this->mwGlobals ) ) {
+				if ( !array_key_exists( $globalKey, $GLOBALS ) ) {
+					throw new Exception( "Global with key {$globalKey} doesn't exist and cant be stashed" );
+				}
+				// NOTE: we serialize then unserialize the value in case it is an object
+				// this stops any objects being passed by reference. We could use clone
+				// and if is_object but this does account for objects within objects!
+				try {
+					$this->mwGlobals[$globalKey] = unserialize( serialize( $GLOBALS[$globalKey] ) );
+				}
+					// NOTE; some things such as Closures are not serializable
+					// in this case just set the value!
+				catch ( Exception $e ) {
+					$this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
+				}
+			}
+		}
+	}
+
+	/**
+	 * Merges the given values into a MW global array variable.
+	 * Useful for setting some entries in a configuration array, instead of
+	 * setting the entire array.
+	 *
+	 * @param string $name The name of the global, as in wgFooBar
+	 * @param array $values The array containing the entries to set in that global
+	 *
+	 * @throws MWException If the designated global is not an array.
+	 *
+	 * @since 1.21
+	 */
+	protected function mergeMwGlobalArrayValue( $name, $values ) {
+		if ( !isset( $GLOBALS[$name] ) ) {
+			$merged = $values;
+		} else {
+			if ( !is_array( $GLOBALS[$name] ) ) {
+				throw new MWException( "MW global $name is not an array." );
+			}
+
+			// NOTE: do not use array_merge, it screws up for numeric keys.
+			$merged = $GLOBALS[$name];
+			foreach ( $values as $k => $v ) {
+				$merged[$k] = $v;
+			}
+		}
+
+		$this->setMwGlobals( $name, $merged );
+	}
+
+	/**
+	 * @return string
+	 * @since 1.18
+	 */
+	public function dbPrefix() {
+		return $this->db->getType() == 'oracle' ? self::ORA_DB_PREFIX : self::DB_PREFIX;
+	}
+
+	/**
+	 * @return bool
+	 * @since 1.18
+	 */
+	public function needsDB() {
+		# if the test says it uses database tables, it needs the database
+		if ( $this->tablesUsed ) {
+			return true;
+		}
+
+		# if the test says it belongs to the Database group, it needs the database
+		$rc = new ReflectionClass( $this );
+		if ( preg_match( '/@group +Database/im', $rc->getDocComment() ) ) {
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Stub. If a test needs to add additional data to the database, it should
+	 * implement this method and do so
+	 *
+	 * @since 1.18
+	 */
+	public function addDBData() {
+	}
+
+	private function addCoreDBData() {
+		if ( $this->db->getType() == 'oracle' ) {
+
+			# Insert 0 user to prevent FK violations
+			# Anonymous user
+			$this->db->insert( 'user', array(
+				'user_id' => 0,
+				'user_name' => 'Anonymous' ), __METHOD__, array( 'IGNORE' ) );
+
+			# Insert 0 page to prevent FK violations
+			# Blank page
+			$this->db->insert( 'page', array(
+				'page_id' => 0,
+				'page_namespace' => 0,
+				'page_title' => ' ',
+				'page_restrictions' => null,
+				'page_counter' => 0,
+				'page_is_redirect' => 0,
+				'page_is_new' => 0,
+				'page_random' => 0,
+				'page_touched' => $this->db->timestamp(),
+				'page_latest' => 0,
+				'page_len' => 0 ), __METHOD__, array( 'IGNORE' ) );
+		}
+
+		User::resetIdByNameCache();
+
+		//Make sysop user
+		$user = User::newFromName( 'UTSysop' );
+
+		if ( $user->idForName() == 0 ) {
+			$user->addToDatabase();
+			$user->setPassword( 'UTSysopPassword' );
+
+			$user->addGroup( 'sysop' );
+			$user->addGroup( 'bureaucrat' );
+			$user->saveSettings();
+		}
+
+		//Make 1 page with 1 revision
+		$page = WikiPage::factory( Title::newFromText( 'UTPage' ) );
+		if ( $page->getId() == 0 ) {
+			$page->doEditContent(
+				new WikitextContent( 'UTContent' ),
+				'UTPageSummary',
+				EDIT_NEW,
+				false,
+				User::newFromName( 'UTSysop' ) );
+		}
+	}
+
+	/**
+	 * Restores MediaWiki to using the table set (table prefix) it was using before
+	 * setupTestDB() was called. Useful if we need to perform database operations
+	 * after the test run has finished (such as saving logs or profiling info).
+	 *
+	 * @since 1.21
+	 */
+	public static function teardownTestDB() {
+		if ( !self::$dbSetup ) {
+			return;
+		}
+
+		CloneDatabase::changePrefix( self::$oldTablePrefix );
+
+		self::$oldTablePrefix = false;
+		self::$dbSetup = false;
+	}
+
+	/**
+	 * Creates an empty skeleton of the wiki database by cloning its structure
+	 * to equivalent tables using the given $prefix. Then sets MediaWiki to
+	 * use the new set of tables (aka schema) instead of the original set.
+	 *
+	 * This is used to generate a dummy table set, typically consisting of temporary
+	 * tables, that will be used by tests instead of the original wiki database tables.
+	 *
+	 * @since 1.21
+	 *
+	 * @note the original table prefix is stored in self::$oldTablePrefix. This is used
+	 * by teardownTestDB() to return the wiki to using the original table set.
+	 *
+	 * @note this method only works when first called. Subsequent calls have no effect,
+	 * even if using different parameters.
+	 *
+	 * @param DatabaseBase $db The database connection
+	 * @param string $prefix The prefix to use for the new table set (aka schema).
+	 *
+	 * @throws MWException If the database table prefix is already $prefix
+	 */
+	public static function setupTestDB( DatabaseBase $db, $prefix ) {
+		global $wgDBprefix;
+		if ( $wgDBprefix === $prefix ) {
+			throw new MWException(
+				'Cannot run unit tests, the database prefix is already "' . $prefix . '"' );
+		}
+
+		if ( self::$dbSetup ) {
+			return;
+		}
+
+		$tablesCloned = self::listTables( $db );
+		$dbClone = new CloneDatabase( $db, $tablesCloned, $prefix );
+		$dbClone->useTemporaryTables( self::$useTemporaryTables );
+
+		self::$dbSetup = true;
+		self::$oldTablePrefix = $wgDBprefix;
+
+		if ( ( $db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
+			CloneDatabase::changePrefix( $prefix );
+
+			return;
+		} else {
+			$dbClone->cloneTableStructure();
+		}
+
+		if ( $db->getType() == 'oracle' ) {
+			$db->query( 'BEGIN FILL_WIKI_INFO; END;' );
+		}
+	}
+
+	/**
+	 * Empty all tables so they can be repopulated for tests
+	 */
+	private function resetDB() {
+		if ( $this->db ) {
+			if ( $this->db->getType() == 'oracle' ) {
+				if ( self::$useTemporaryTables ) {
+					wfGetLB()->closeAll();
+					$this->db = wfGetDB( DB_MASTER );
+				} else {
+					foreach ( $this->tablesUsed as $tbl ) {
+						if ( $tbl == 'interwiki' ) {
+							continue;
+						}
+						$this->db->query( 'TRUNCATE TABLE ' . $this->db->tableName( $tbl ), __METHOD__ );
+					}
+				}
+			} else {
+				foreach ( $this->tablesUsed as $tbl ) {
+					if ( $tbl == 'interwiki' || $tbl == 'user' ) {
+						continue;
+					}
+					$this->db->delete( $tbl, '*', __METHOD__ );
+				}
+			}
+		}
+	}
+
+	/**
+	 * @since 1.18
+	 *
+	 * @param string $func
+	 * @param array $args
+	 *
+	 * @return mixed
+	 * @throws MWException
+	 */
+	public function __call( $func, $args ) {
+		static $compatibility = array(
+			'assertEmpty' => 'assertEmpty2', // assertEmpty was added in phpunit 3.7.32
+		);
+
+		if ( isset( $compatibility[$func] ) ) {
+			return call_user_func_array( array( $this, $compatibility[$func] ), $args );
+		} else {
+			throw new MWException( "Called non-existant $func method on "
+				. get_class( $this ) );
+		}
+	}
+
+	/**
+	 * Used as a compatibility method for phpunit < 3.7.32
+	 * @param string $value
+	 * @param string $msg
+	 */
+	private function assertEmpty2( $value, $msg ) {
+		return $this->assertTrue( $value == '', $msg );
+	}
+
+	private static function unprefixTable( $tableName ) {
+		global $wgDBprefix;
+
+		return substr( $tableName, strlen( $wgDBprefix ) );
+	}
+
+	private static function isNotUnittest( $table ) {
+		return strpos( $table, 'unittest_' ) !== 0;
+	}
+
+	/**
+	 * @since 1.18
+	 *
+	 * @param DataBaseBase $db
+	 *
+	 * @return array
+	 */
+	public static function listTables( $db ) {
+		global $wgDBprefix;
+
+		$tables = $db->listTables( $wgDBprefix, __METHOD__ );
+
+		if ( $db->getType() === 'mysql' ) {
+			# bug 43571: cannot clone VIEWs under MySQL
+			$views = $db->listViews( $wgDBprefix, __METHOD__ );
+			$tables = array_diff( $tables, $views );
+		}
+		$tables = array_map( array( __CLASS__, 'unprefixTable' ), $tables );
+
+		// Don't duplicate test tables from the previous fataled run
+		$tables = array_filter( $tables, array( __CLASS__, 'isNotUnittest' ) );
+
+		if ( $db->getType() == 'sqlite' ) {
+			$tables = array_flip( $tables );
+			// these are subtables of searchindex and don't need to be duped/dropped separately
+			unset( $tables['searchindex_content'] );
+			unset( $tables['searchindex_segdir'] );
+			unset( $tables['searchindex_segments'] );
+			$tables = array_flip( $tables );
+		}
+
+		return $tables;
+	}
+
+	/**
+	 * @throws MWException
+	 * @since 1.18
+	 */
+	protected function checkDbIsSupported() {
+		if ( !in_array( $this->db->getType(), $this->supportedDBs ) ) {
+			throw new MWException( $this->db->getType() . " is not currently supported for unit testing." );
+		}
+	}
+
+	/**
+	 * @since 1.18
+	 * @param string $offset
+	 * @return mixed
+	 */
+	public function getCliArg( $offset ) {
+		if ( isset( PHPUnitMaintClass::$additionalOptions[$offset] ) ) {
+			return PHPUnitMaintClass::$additionalOptions[$offset];
+		}
+	}
+
+	/**
+	 * @since 1.18
+	 * @param string $offset
+	 * @param mixed $value
+	 */
+	public function setCliArg( $offset, $value ) {
+		PHPUnitMaintClass::$additionalOptions[$offset] = $value;
+	}
+
+	/**
+	 * Don't throw a warning if $function is deprecated and called later
+	 *
+	 * @since 1.19
+	 *
+	 * @param string $function
+	 */
+	public function hideDeprecated( $function ) {
+		wfSuppressWarnings();
+		wfDeprecated( $function );
+		wfRestoreWarnings();
+	}
+
+	/**
+	 * Asserts that the given database query yields the rows given by $expectedRows.
+	 * The expected rows should be given as indexed (not associative) arrays, with
+	 * the values given in the order of the columns in the $fields parameter.
+	 * Note that the rows are sorted by the columns given in $fields.
+	 *
+	 * @since 1.20
+	 *
+	 * @param string|array $table The table(s) to query
+	 * @param string|array $fields The columns to include in the result (and to sort by)
+	 * @param string|array $condition "where" condition(s)
+	 * @param array $expectedRows An array of arrays giving the expected rows.
+	 *
+	 * @throws MWException If this test cases's needsDB() method doesn't return true.
+	 *         Test cases can use "@group Database" to enable database test support,
+	 *         or list the tables under testing in $this->tablesUsed, or override the
+	 *         needsDB() method.
+	 */
+	protected function assertSelect( $table, $fields, $condition, array $expectedRows ) {
+		if ( !$this->needsDB() ) {
+			throw new MWException( 'When testing database state, the test cases\'s needDB()' .
+				' method should return true. Use @group Database or $this->tablesUsed.' );
+		}
+
+		$db = wfGetDB( DB_SLAVE );
+
+		$res = $db->select( $table, $fields, $condition, wfGetCaller(), array( 'ORDER BY' => $fields ) );
+		$this->assertNotEmpty( $res, "query failed: " . $db->lastError() );
+
+		$i = 0;
+
+		foreach ( $expectedRows as $expected ) {
+			$r = $res->fetchRow();
+			self::stripStringKeys( $r );
+
+			$i += 1;
+			$this->assertNotEmpty( $r, "row #$i missing" );
+
+			$this->assertEquals( $expected, $r, "row #$i mismatches" );
+		}
+
+		$r = $res->fetchRow();
+		self::stripStringKeys( $r );
+
+		$this->assertFalse( $r, "found extra row (after #$i)" );
+	}
+
+	/**
+	 * Utility method taking an array of elements and wrapping
+	 * each element in it's own array. Useful for data providers
+	 * that only return a single argument.
+	 *
+	 * @since 1.20
+	 *
+	 * @param array $elements
+	 *
+	 * @return array
+	 */
+	protected function arrayWrap( array $elements ) {
+		return array_map(
+			function ( $element ) {
+				return array( $element );
+			},
+			$elements
+		);
+	}
+
+	/**
+	 * Assert that two arrays are equal. By default this means that both arrays need to hold
+	 * the same set of values. Using additional arguments, order and associated key can also
+	 * be set as relevant.
+	 *
+	 * @since 1.20
+	 *
+	 * @param array $expected
+	 * @param array $actual
+	 * @param bool $ordered If the order of the values should match
+	 * @param bool $named If the keys should match
+	 */
+	protected function assertArrayEquals( array $expected, array $actual,
+		$ordered = false, $named = false
+	) {
+		if ( !$ordered ) {
+			$this->objectAssociativeSort( $expected );
+			$this->objectAssociativeSort( $actual );
+		}
+
+		if ( !$named ) {
+			$expected = array_values( $expected );
+			$actual = array_values( $actual );
+		}
+
+		call_user_func_array(
+			array( $this, 'assertEquals' ),
+			array_merge( array( $expected, $actual ), array_slice( func_get_args(), 4 ) )
+		);
+	}
+
+	/**
+	 * Put each HTML element on its own line and then equals() the results
+	 *
+	 * Use for nicely formatting of PHPUnit diff output when comparing very
+	 * simple HTML
+	 *
+	 * @since 1.20
+	 *
+	 * @param string $expected HTML on oneline
+	 * @param string $actual HTML on oneline
+	 * @param string $msg Optional message
+	 */
+	protected function assertHTMLEquals( $expected, $actual, $msg = '' ) {
+		$expected = str_replace( '>', ">\n", $expected );
+		$actual = str_replace( '>', ">\n", $actual );
+
+		$this->assertEquals( $expected, $actual, $msg );
+	}
+
+	/**
+	 * Does an associative sort that works for objects.
+	 *
+	 * @since 1.20
+	 *
+	 * @param array $array
+	 */
+	protected function objectAssociativeSort( array &$array ) {
+		uasort(
+			$array,
+			function ( $a, $b ) {
+				return serialize( $a ) > serialize( $b ) ? 1 : -1;
+			}
+		);
+	}
+
+	/**
+	 * Utility function for eliminating all string keys from an array.
+	 * Useful to turn a database result row as returned by fetchRow() into
+	 * a pure indexed array.
+	 *
+	 * @since 1.20
+	 *
+	 * @param mixed $r The array to remove string keys from.
+	 */
+	protected static function stripStringKeys( &$r ) {
+		if ( !is_array( $r ) ) {
+			return;
+		}
+
+		foreach ( $r as $k => $v ) {
+			if ( is_string( $k ) ) {
+				unset( $r[$k] );
+			}
+		}
+	}
+
+	/**
+	 * Asserts that the provided variable is of the specified
+	 * internal type or equals the $value argument. This is useful
+	 * for testing return types of functions that return a certain
+	 * type or *value* when not set or on error.
+	 *
+	 * @since 1.20
+	 *
+	 * @param string $type
+	 * @param mixed $actual
+	 * @param mixed $value
+	 * @param string $message
+	 */
+	protected function assertTypeOrValue( $type, $actual, $value = false, $message = '' ) {
+		if ( $actual === $value ) {
+			$this->assertTrue( true, $message );
+		} else {
+			$this->assertType( $type, $actual, $message );
+		}
+	}
+
+	/**
+	 * Asserts the type of the provided value. This can be either
+	 * in internal type such as boolean or integer, or a class or
+	 * interface the value extends or implements.
+	 *
+	 * @since 1.20
+	 *
+	 * @param string $type
+	 * @param mixed $actual
+	 * @param string $message
+	 */
+	protected function assertType( $type, $actual, $message = '' ) {
+		if ( class_exists( $type ) || interface_exists( $type ) ) {
+			$this->assertInstanceOf( $type, $actual, $message );
+		} else {
+			$this->assertInternalType( $type, $actual, $message );
+		}
+	}
+
+	/**
+	 * Returns true if the given namespace defaults to Wikitext
+	 * according to $wgNamespaceContentModels
+	 *
+	 * @param int $ns The namespace ID to check
+	 *
+	 * @return bool
+	 * @since 1.21
+	 */
+	protected function isWikitextNS( $ns ) {
+		global $wgNamespaceContentModels;
+
+		if ( isset( $wgNamespaceContentModels[$ns] ) ) {
+			return $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT;
+		}
+
+		return true;
+	}
+
+	/**
+	 * Returns the ID of a namespace that defaults to Wikitext.
+	 *
+	 * @throws MWException If there is none.
+	 * @return int The ID of the wikitext Namespace
+	 * @since 1.21
+	 */
+	protected function getDefaultWikitextNS() {
+		global $wgNamespaceContentModels;
+
+		static $wikitextNS = null; // this is not going to change
+		if ( $wikitextNS !== null ) {
+			return $wikitextNS;
+		}
+
+		// quickly short out on most common case:
+		if ( !isset( $wgNamespaceContentModels[NS_MAIN] ) ) {
+			return NS_MAIN;
+		}
+
+		// NOTE: prefer content namespaces
+		$namespaces = array_unique( array_merge(
+			MWNamespace::getContentNamespaces(),
+			array( NS_MAIN, NS_HELP, NS_PROJECT ), // prefer these
+			MWNamespace::getValidNamespaces()
+		) );
+
+		$namespaces = array_diff( $namespaces, array(
+			NS_FILE, NS_CATEGORY, NS_MEDIAWIKI, NS_USER // don't mess with magic namespaces
+		) );
+
+		$talk = array_filter( $namespaces, function ( $ns ) {
+			return MWNamespace::isTalk( $ns );
+		} );
+
+		// prefer non-talk pages
+		$namespaces = array_diff( $namespaces, $talk );
+		$namespaces = array_merge( $namespaces, $talk );
+
+		// check default content model of each namespace
+		foreach ( $namespaces as $ns ) {
+			if ( !isset( $wgNamespaceContentModels[$ns] ) ||
+				$wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT
+			) {
+
+				$wikitextNS = $ns;
+
+				return $wikitextNS;
+			}
+		}
+
+		// give up
+		// @todo Inside a test, we could skip the test as incomplete.
+		//        But frequently, this is used in fixture setup.
+		throw new MWException( "No namespace defaults to wikitext!" );
+	}
+
+	/**
+	 * Check, if $wgDiff3 is set and ready to merge
+	 * Will mark the calling test as skipped, if not ready
+	 *
+	 * @since 1.21
+	 */
+	protected function checkHasDiff3() {
+		global $wgDiff3;
+
+		# This check may also protect against code injection in
+		# case of broken installations.
+		wfSuppressWarnings();
+		$haveDiff3 = $wgDiff3 && file_exists( $wgDiff3 );
+		wfRestoreWarnings();
+
+		if ( !$haveDiff3 ) {
+			$this->markTestSkipped( "Skip test, since diff3 is not configured" );
+		}
+	}
+
+	/**
+	 * Check whether we have the 'gzip' commandline utility, will skip
+	 * the test whenever "gzip -V" fails.
+	 *
+	 * Result is cached at the process level.
+	 *
+	 * @return bool
+	 *
+	 * @since 1.21
+	 */
+	protected function checkHasGzip() {
+		static $haveGzip;
+
+		if ( $haveGzip === null ) {
+			$retval = null;
+			wfShellExec( 'gzip -V', $retval );
+			$haveGzip = ( $retval === 0 );
+		}
+
+		if ( !$haveGzip ) {
+			$this->markTestSkipped( "Skip test, requires the gzip utility in PATH" );
+		}
+
+		return $haveGzip;
+	}
+
+	/**
+	 * Check if $extName is a loaded PHP extension, will skip the
+	 * test whenever it is not loaded.
+	 *
+	 * @since 1.21
+	 * @param string $extName
+	 * @return bool
+	 */
+	protected function checkPHPExtension( $extName ) {
+		$loaded = extension_loaded( $extName );
+		if ( !$loaded ) {
+			$this->markTestSkipped( "PHP extension '$extName' is not loaded, skipping." );
+		}
+
+		return $loaded;
+	}
+
+	/**
+	 * Asserts that an exception of the specified type occurs when running
+	 * the provided code.
+	 *
+	 * @since 1.21
+	 * @deprecated since 1.22 Use setExpectedException
+	 *
+	 * @param callable $code
+	 * @param string $expected
+	 * @param string $message
+	 */
+	protected function assertException( $code, $expected = 'Exception', $message = '' ) {
+		$pokemons = null;
+
+		try {
+			call_user_func( $code );
+		} catch ( Exception $pokemons ) {
+			// Gotta Catch 'Em All!
+		}
+
+		if ( $message === '' ) {
+			$message = 'An exception of type "' . $expected . '" should have been thrown';
+		}
+
+		$this->assertInstanceOf( $expected, $pokemons, $message );
+	}
+
+	/**
+	 * Asserts that the given string is a valid HTML snippet.
+	 * Wraps the given string in the required top level tags and
+	 * then calls assertValidHtmlDocument().
+	 * The snippet is expected to be HTML 5.
+	 *
+	 * @since 1.23
+	 *
+	 * @note Will mark the test as skipped if the "tidy" module is not installed.
+	 * @note This ignores $wgUseTidy, so we can check for valid HTML even (and especially)
+	 *        when automatic tidying is disabled.
+	 *
+	 * @param string $html An HTML snippet (treated as the contents of the body tag).
+	 */
+	protected function assertValidHtmlSnippet( $html ) {
+		$html = '<!DOCTYPE html><html><head><title>test</title></head><body>' . $html . '</body></html>';
+		$this->assertValidHtmlDocument( $html );
+	}
+
+	/**
+	 * Asserts that the given string is valid HTML document.
+	 *
+	 * @since 1.23
+	 *
+	 * @note Will mark the test as skipped if the "tidy" module is not installed.
+	 * @note This ignores $wgUseTidy, so we can check for valid HTML even (and especially)
+	 *        when automatic tidying is disabled.
+	 *
+	 * @param string $html A complete HTML document
+	 */
+	protected function assertValidHtmlDocument( $html ) {
+		// Note: we only validate if the tidy PHP extension is available.
+		// In case wgTidyInternal is false, MWTidy would fall back to the command line version
+		// of tidy. In that case however, we can not reliably detect whether a failing validation
+		// is due to malformed HTML, or caused by tidy not being installed as a command line tool.
+		// That would cause all HTML assertions to fail on a system that has no tidy installed.
+		if ( !$GLOBALS['wgTidyInternal'] ) {
+			$this->markTestSkipped( 'Tidy extension not installed' );
+		}
+
+		$errorBuffer = '';
+		MWTidy::checkErrors( $html, $errorBuffer );
+		$allErrors = preg_split( '/[\r\n]+/', $errorBuffer );
+
+		// Filter Tidy warnings which aren't useful for us.
+		// Tidy eg. often cries about parameters missing which have actually
+		// been deprecated since HTML4, thus we should not care about them.
+		$errors = preg_grep(
+			'/^(.*Warning: (trimming empty|.* lacks ".*?" attribute).*|\s*)$/m',
+			$allErrors, PREG_GREP_INVERT
+		);
+
+		$this->assertEmpty( $errors, implode( "\n", $errors ) );
+	}
+
+	/**
+	 * Note: we are overriding this method to remove the deprecated error
+	 * @see https://bugzilla.wikimedia.org/show_bug.cgi?id=69505
+	 * @see https://github.com/sebastianbergmann/phpunit/issues/1292
+	 *
+	 * @param array $matcher
+	 * @param string $actual
+	 * @param string $message
+	 * @param bool $isHtml
+	 */
+	public static function assertTag( $matcher, $actual, $message = '', $isHtml = true ) {
+		//trigger_error(__METHOD__ . ' is deprecated', E_USER_DEPRECATED);
+
+		$dom = PHPUnit_Util_XML::load( $actual, $isHtml );
+		$tags = PHPUnit_Util_XML::findNodes( $dom, $matcher, $isHtml );
+		$matched = count( $tags ) > 0 && $tags[0] instanceof DOMNode;
+
+		self::assertTrue( $matched, $message );
+	}
+}