tests/phpunit/MediaWikiTestCase.php

   1 <?php
   2
   3 use MediaWiki\Logger\LegacySpi;
   4 use MediaWiki\Logger\LoggerFactory;
   5 use MediaWiki\Logger\MonologSpi;
   6 use MediaWiki\MediaWikiServices;
   7 use Psr\Log\LoggerInterface;
   8 use Wikimedia\Rdbms\IDatabase;
   9 use Wikimedia\Rdbms\IMaintainableDatabase;
  10 use Wikimedia\Rdbms\Database;
  11 use Wikimedia\Rdbms\LBFactory;
  12 use Wikimedia\TestingAccessWrapper;
  13
  14 /**
  15  * @since 1.18
  16  */
  17 abstract class MediaWikiTestCase extends PHPUnit\Framework\TestCase {
  18
  19         use MediaWikiCoversValidator;
  20         use PHPUnit4And6Compat;
  21
  22         /**
  23          * The service locator created by prepareServices(). This service locator will
  24          * be restored after each test. Tests that pollute the global service locator
  25          * instance should use overrideMwServices() to isolate the test.
  26          *
  27          * @var MediaWikiServices|null
  28          */
  29         private static $serviceLocator = null;
  30
  31         /**
  32          * $called tracks whether the setUp and tearDown method has been called.
  33          * class extending MediaWikiTestCase usually override setUp and tearDown
  34          * but forget to call the parent.
  35          *
  36          * The array format takes a method name as key and anything as a value.
  37          * By asserting the key exist, we know the child class has called the
  38          * parent.
  39          *
  40          * This property must be private, we do not want child to override it,
  41          * they should call the appropriate parent method instead.
  42          */
  43         private $called = [];
  44
  45         /**
  46          * @var TestUser[]
  47          * @since 1.20
  48          */
  49         public static $users;
  50
  51         /**
  52          * Primary database
  53          *
  54          * @var Database
  55          * @since 1.18
  56          */
  57         protected $db;
  58
  59         /**
  60          * @var array
  61          * @since 1.19
  62          */
  63         protected $tablesUsed = []; // tables with data
  64
  65         private static $useTemporaryTables = true;
  66         private static $reuseDB = false;
  67         private static $dbSetup = false;
  68         private static $oldTablePrefix = '';
  69
  70         /**
  71          * Original value of PHP's error_reporting setting.
  72          *
  73          * @var int
  74          */
  75         private $phpErrorLevel;
  76
  77         /**
  78          * Holds the paths of temporary files/directories created through getNewTempFile,
  79          * and getNewTempDirectory
  80          *
  81          * @var array
  82          */
  83         private $tmpFiles = [];
  84
  85         /**
  86          * Holds original values of MediaWiki configuration settings
  87          * to be restored in tearDown().
  88          * See also setMwGlobals().
  89          * @var array
  90          */
  91         private $mwGlobals = [];
  92
  93         /**
  94          * Holds list of MediaWiki configuration settings to be unset in tearDown().
  95          * See also setMwGlobals().
  96          * @var array
  97          */
  98         private $mwGlobalsToUnset = [];
  99
 100         /**
 101          * Holds original loggers which have been replaced by setLogger()
 102          * @var LoggerInterface[]
 103          */
 104         private $loggers = [];
 105
 106         /**
 107          * Table name prefixes. Oracle likes it shorter.
 108          */
 109         const DB_PREFIX = 'unittest_';
 110         const ORA_DB_PREFIX = 'ut_';
 111
 112         /**
 113          * @var array
 114          * @since 1.18
 115          */
 116         protected $supportedDBs = [
 117                 'mysql',
 118                 'sqlite',
 119                 'postgres',
 120                 'oracle'
 121         ];
 122
 123         public function __construct( $name = null, array $data = [], $dataName = '' ) {
 124                 parent::__construct( $name, $data, $dataName );
 125
 126                 $this->backupGlobals = false;
 127                 $this->backupStaticAttributes = false;
 128         }
 129
 130         public function __destruct() {
 131                 // Complain if self::setUp() was called, but not self::tearDown()
 132                 // $this->called['setUp'] will be checked by self::testMediaWikiTestCaseParentSetupCalled()
 133                 if ( isset( $this->called['setUp'] ) && !isset( $this->called['tearDown'] ) ) {
 134                         throw new MWException( static::class . "::tearDown() must call parent::tearDown()" );
 135                 }
 136         }
 137
 138         public static function setUpBeforeClass() {
 139                 parent::setUpBeforeClass();
 140
 141                 // Get the service locator, and reset services if it's not done already
 142                 self::$serviceLocator = self::prepareServices( new GlobalVarConfig() );
 143         }
 144
 145         /**
 146          * Convenience method for getting an immutable test user
 147          *
 148          * @since 1.28
 149          *
 150          * @param string[] $groups Groups the test user should be in.
 151          * @return TestUser
 152          */
 153         public static function getTestUser( $groups = [] ) {
 154                 return TestUserRegistry::getImmutableTestUser( $groups );
 155         }
 156
 157         /**
 158          * Convenience method for getting a mutable test user
 159          *
 160          * @since 1.28
 161          *
 162          * @param string[] $groups Groups the test user should be added in.
 163          * @return TestUser
 164          */
 165         public static function getMutableTestUser( $groups = [] ) {
 166                 return TestUserRegistry::getMutableTestUser( __CLASS__, $groups );
 167         }
 168
 169         /**
 170          * Convenience method for getting an immutable admin test user
 171          *
 172          * @since 1.28
 173          *
 174          * @param string[] $groups Groups the test user should be added to.
 175          * @return TestUser
 176          */
 177         public static function getTestSysop() {
 178                 return self::getTestUser( [ 'sysop', 'bureaucrat' ] );
 179         }
 180
 181         /**
 182          * Prepare service configuration for unit testing.
 183          *
 184          * This calls MediaWikiServices::resetGlobalInstance() to allow some critical services
 185          * to be overridden for testing.
 186          *
 187          * prepareServices() only needs to be called once, but should be called as early as possible,
 188          * before any class has a chance to grab a reference to any of the global services
 189          * instances that get discarded by prepareServices(). Only the first call has any effect,
 190          * later calls are ignored.
 191          *
 192          * @note This is called by PHPUnitMaintClass::finalSetup.
 193          *
 194          * @see MediaWikiServices::resetGlobalInstance()
 195          *
 196          * @param Config $bootstrapConfig The bootstrap config to use with the new
 197          *        MediaWikiServices. Only used for the first call to this method.
 198          * @return MediaWikiServices
 199          */
 200         public static function prepareServices( Config $bootstrapConfig ) {
 201                 static $services = null;
 202
 203                 if ( !$services ) {
 204                         $services = self::resetGlobalServices( $bootstrapConfig );
 205                 }
 206                 return $services;
 207         }
 208
 209         /**
 210          * Reset global services, and install testing environment.
 211          * This is the testing equivalent of MediaWikiServices::resetGlobalInstance().
 212          * This should only be used to set up the testing environment, not when
 213          * running unit tests. Use MediaWikiTestCase::overrideMwServices() for that.
 214          *
 215          * @see MediaWikiServices::resetGlobalInstance()
 216          * @see prepareServices()
 217          * @see MediaWikiTestCase::overrideMwServices()
 218          *
 219          * @param Config|null $bootstrapConfig The bootstrap config to use with the new
 220          *        MediaWikiServices.
 221          * @return MediaWikiServices
 222          */
 223         protected static function resetGlobalServices( Config $bootstrapConfig = null ) {
 224                 $oldServices = MediaWikiServices::getInstance();
 225                 $oldConfigFactory = $oldServices->getConfigFactory();
 226                 $oldLoadBalancerFactory = $oldServices->getDBLoadBalancerFactory();
 227
 228                 $testConfig = self::makeTestConfig( $bootstrapConfig );
 229
 230                 MediaWikiServices::resetGlobalInstance( $testConfig );
 231
 232                 $serviceLocator = MediaWikiServices::getInstance();
 233                 self::installTestServices(
 234                         $oldConfigFactory,
 235                         $oldLoadBalancerFactory,
 236                         $serviceLocator
 237                 );
 238                 return $serviceLocator;
 239         }
 240
 241         /**
 242          * Create a config suitable for testing, based on a base config, default overrides,
 243          * and custom overrides.
 244          *
 245          * @param Config|null $baseConfig
 246          * @param Config|null $customOverrides
 247          *
 248          * @return Config
 249          */
 250         private static function makeTestConfig(
 251                 Config $baseConfig = null,
 252                 Config $customOverrides = null
 253         ) {
 254                 $defaultOverrides = new HashConfig();
 255
 256                 if ( !$baseConfig ) {
 257                         $baseConfig = MediaWikiServices::getInstance()->getBootstrapConfig();
 258                 }
 259
 260                 /* Some functions require some kind of caching, and will end up using the db,
 261                  * which we can't allow, as that would open a new connection for mysql.
 262                  * Replace with a HashBag. They would not be going to persist anyway.
 263                  */
 264                 $hashCache = [ 'class' => HashBagOStuff::class, 'reportDupes' => false ];
 265                 $objectCaches = [
 266                                 CACHE_DB => $hashCache,
 267                                 CACHE_ACCEL => $hashCache,
 268                                 CACHE_MEMCACHED => $hashCache,
 269                                 'apc' => $hashCache,
 270                                 'apcu' => $hashCache,
 271                                 'wincache' => $hashCache,
 272                         ] + $baseConfig->get( 'ObjectCaches' );
 273
 274                 $defaultOverrides->set( 'ObjectCaches', $objectCaches );
 275                 $defaultOverrides->set( 'MainCacheType', CACHE_NONE );
 276                 $defaultOverrides->set( 'JobTypeConf', [ 'default' => [ 'class' => JobQueueMemory::class ] ] );
 277
 278                 // Use a fast hash algorithm to hash passwords.
 279                 $defaultOverrides->set( 'PasswordDefault', 'A' );
 280
 281                 $testConfig = $customOverrides
 282                         ? new MultiConfig( [ $customOverrides, $defaultOverrides, $baseConfig ] )
 283                         : new MultiConfig( [ $defaultOverrides, $baseConfig ] );
 284
 285                 return $testConfig;
 286         }
 287
 288         /**
 289          * @param ConfigFactory $oldConfigFactory
 290          * @param LBFactory $oldLoadBalancerFactory
 291          * @param MediaWikiServices $newServices
 292          *
 293          * @throws MWException
 294          */
 295         private static function installTestServices(
 296                 ConfigFactory $oldConfigFactory,
 297                 LBFactory $oldLoadBalancerFactory,
 298                 MediaWikiServices $newServices
 299         ) {
 300                 // Use bootstrap config for all configuration.
 301                 // This allows config overrides via global variables to take effect.
 302                 $bootstrapConfig = $newServices->getBootstrapConfig();
 303                 $newServices->resetServiceForTesting( 'ConfigFactory' );
 304                 $newServices->redefineService(
 305                         'ConfigFactory',
 306                         self::makeTestConfigFactoryInstantiator(
 307                                 $oldConfigFactory,
 308                                 [ 'main' => $bootstrapConfig ]
 309                         )
 310                 );
 311                 $newServices->resetServiceForTesting( 'DBLoadBalancerFactory' );
 312                 $newServices->redefineService(
 313                         'DBLoadBalancerFactory',
 314                         function ( MediaWikiServices $services ) use ( $oldLoadBalancerFactory ) {
 315                                 return $oldLoadBalancerFactory;
 316                         }
 317                 );
 318         }
 319
 320         /**
 321          * @param ConfigFactory $oldFactory
 322          * @param Config[] $configurations
 323          *
 324          * @return Closure
 325          */
 326         private static function makeTestConfigFactoryInstantiator(
 327                 ConfigFactory $oldFactory,
 328                 array $configurations
 329         ) {
 330                 return function ( MediaWikiServices $services ) use ( $oldFactory, $configurations ) {
 331                         $factory = new ConfigFactory();
 332
 333                         // clone configurations from $oldFactory that are not overwritten by $configurations
 334                         $namesToClone = array_diff(
 335                                 $oldFactory->getConfigNames(),
 336                                 array_keys( $configurations )
 337                         );
 338
 339                         foreach ( $namesToClone as $name ) {
 340                                 $factory->register( $name, $oldFactory->makeConfig( $name ) );
 341                         }
 342
 343                         foreach ( $configurations as $name => $config ) {
 344                                 $factory->register( $name, $config );
 345                         }
 346
 347                         return $factory;
 348                 };
 349         }
 350
 351         /**
 352          * Resets some well known services that typically have state that may interfere with unit tests.
 353          * This is a lightweight alternative to resetGlobalServices().
 354          *
 355          * @note There is no guarantee that no references remain to stale service instances destroyed
 356          * by a call to doLightweightServiceReset().
 357          *
 358          * @throws MWException if called outside of PHPUnit tests.
 359          *
 360          * @see resetGlobalServices()
 361          */
 362         private function doLightweightServiceReset() {
 363                 global $wgRequest;
 364
 365                 JobQueueGroup::destroySingletons();
 366                 ObjectCache::clear();
 367                 $services = MediaWikiServices::getInstance();
 368                 $services->resetServiceForTesting( 'MainObjectStash' );
 369                 $services->resetServiceForTesting( 'LocalServerObjectCache' );
 370                 $services->getMainWANObjectCache()->clearProcessCache();
 371                 FileBackendGroup::destroySingleton();
 372
 373                 // TODO: move global state into MediaWikiServices
 374                 RequestContext::resetMain();
 375                 if ( session_id() !== '' ) {
 376                         session_write_close();
 377                         session_id( '' );
 378                 }
 379
 380                 $wgRequest = new FauxRequest();
 381                 MediaWiki\Session\SessionManager::resetCache();
 382         }
 383
 384         public function run( PHPUnit_Framework_TestResult $result = null ) {
 385                 // Reset all caches between tests.
 386                 $this->doLightweightServiceReset();
 387
 388                 $needsResetDB = false;
 389
 390                 if ( !self::$dbSetup || $this->needsDB() ) {
 391                         // set up a DB connection for this test to use
 392
 393                         self::$useTemporaryTables = !$this->getCliArg( 'use-normal-tables' );
 394                         self::$reuseDB = $this->getCliArg( 'reuse-db' );
 395
 396                         $this->db = wfGetDB( DB_MASTER );
 397
 398                         $this->checkDbIsSupported();
 399
 400                         if ( !self::$dbSetup ) {
 401                                 $this->setupAllTestDBs();
 402                                 $this->addCoreDBData();
 403
 404                                 if ( ( $this->db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
 405                                         $this->resetDB( $this->db, $this->tablesUsed );
 406                                 }
 407                         }
 408
 409                         // TODO: the DB setup should be done in setUpBeforeClass(), so the test DB
 410                         // is available in subclass's setUpBeforeClass() and setUp() methods.
 411                         // This would also remove the need for the HACK that is oncePerClass().
 412                         if ( $this->oncePerClass() ) {
 413                                 $this->setUpSchema( $this->db );
 414                                 $this->addDBDataOnce();
 415                         }
 416
 417                         $this->addDBData();
 418                         $needsResetDB = true;
 419                 }
 420
 421                 parent::run( $result );
 422
 423                 if ( $needsResetDB ) {
 424                         $this->resetDB( $this->db, $this->tablesUsed );
 425                 }
 426         }
 427
 428         /**
 429          * @return bool
 430          */
 431         private function oncePerClass() {
 432                 // Remember current test class in the database connection,
 433                 // so we know when we need to run addData.
 434
 435                 $class = static::class;
 436
 437                 $first = !isset( $this->db->_hasDataForTestClass )
 438                         || $this->db->_hasDataForTestClass !== $class;
 439
 440                 $this->db->_hasDataForTestClass = $class;
 441                 return $first;
 442         }
 443
 444         /**
 445          * @since 1.21
 446          *
 447          * @return bool
 448          */
 449         public function usesTemporaryTables() {
 450                 return self::$useTemporaryTables;
 451         }
 452
 453         /**
 454          * Obtains a new temporary file name
 455          *
 456          * The obtained filename is enlisted to be removed upon tearDown
 457          *
 458          * @since 1.20
 459          *
 460          * @return string Absolute name of the temporary file
 461          */
 462         protected function getNewTempFile() {
 463                 $fileName = tempnam( wfTempDir(), 'MW_PHPUnit_' . static::class . '_' );
 464                 $this->tmpFiles[] = $fileName;
 465
 466                 return $fileName;
 467         }
 468
 469         /**
 470          * obtains a new temporary directory
 471          *
 472          * The obtained directory is enlisted to be removed (recursively with all its contained
 473          * files) upon tearDown.
 474          *
 475          * @since 1.20
 476          *
 477          * @return string Absolute name of the temporary directory
 478          */
 479         protected function getNewTempDirectory() {
 480                 // Starting of with a temporary /file/.
 481                 $fileName = $this->getNewTempFile();
 482
 483                 // Converting the temporary /file/ to a /directory/
 484                 // The following is not atomic, but at least we now have a single place,
 485                 // where temporary directory creation is bundled and can be improved
 486                 unlink( $fileName );
 487                 $this->assertTrue( wfMkdirParents( $fileName ) );
 488
 489                 return $fileName;
 490         }
 491
 492         protected function setUp() {
 493                 parent::setUp();
 494                 $this->called['setUp'] = true;
 495
 496                 $this->phpErrorLevel = intval( ini_get( 'error_reporting' ) );
 497
 498                 // Cleaning up temporary files
 499                 foreach ( $this->tmpFiles as $fileName ) {
 500                         if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
 501                                 unlink( $fileName );
 502                         } elseif ( is_dir( $fileName ) ) {
 503                                 wfRecursiveRemoveDir( $fileName );
 504                         }
 505                 }
 506
 507                 if ( $this->needsDB() && $this->db ) {
 508                         // Clean up open transactions
 509                         while ( $this->db->trxLevel() > 0 ) {
 510                                 $this->db->rollback( __METHOD__, 'flush' );
 511                         }
 512                         // Check for unsafe queries
 513                         if ( $this->db->getType() === 'mysql' ) {
 514                                 $this->db->query( "SET sql_mode = 'STRICT_ALL_TABLES'" );
 515                         }
 516                 }
 517
 518                 DeferredUpdates::clearPendingUpdates();
 519                 ObjectCache::getMainWANInstance()->clearProcessCache();
 520
 521                 // XXX: reset maintenance triggers
 522                 // Hook into period lag checks which often happen in long-running scripts
 523                 $services = MediaWikiServices::getInstance();
 524                 $lbFactory = $services->getDBLoadBalancerFactory();
 525                 Maintenance::setLBFactoryTriggers( $lbFactory, $services->getMainConfig() );
 526
 527                 ob_start( 'MediaWikiTestCase::wfResetOutputBuffersBarrier' );
 528         }
 529
 530         protected function addTmpFiles( $files ) {
 531                 $this->tmpFiles = array_merge( $this->tmpFiles, (array)$files );
 532         }
 533
 534         protected function tearDown() {
 535                 global $wgRequest, $wgSQLMode;
 536
 537                 $status = ob_get_status();
 538                 if ( isset( $status['name'] ) &&
 539                         $status['name'] === 'MediaWikiTestCase::wfResetOutputBuffersBarrier'
 540                 ) {
 541                         ob_end_flush();
 542                 }
 543
 544                 $this->called['tearDown'] = true;
 545                 // Cleaning up temporary files
 546                 foreach ( $this->tmpFiles as $fileName ) {
 547                         if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
 548                                 unlink( $fileName );
 549                         } elseif ( is_dir( $fileName ) ) {
 550                                 wfRecursiveRemoveDir( $fileName );
 551                         }
 552                 }
 553
 554                 if ( $this->needsDB() && $this->db ) {
 555                         // Clean up open transactions
 556                         while ( $this->db->trxLevel() > 0 ) {
 557                                 $this->db->rollback( __METHOD__, 'flush' );
 558                         }
 559                         if ( $this->db->getType() === 'mysql' ) {
 560                                 $this->db->query( "SET sql_mode = " . $this->db->addQuotes( $wgSQLMode ) );
 561                         }
 562                 }
 563
 564                 // Restore mw globals
 565                 foreach ( $this->mwGlobals as $key => $value ) {
 566                         $GLOBALS[$key] = $value;
 567                 }
 568                 foreach ( $this->mwGlobalsToUnset as $value ) {
 569                         unset( $GLOBALS[$value] );
 570                 }
 571                 $this->mwGlobals = [];
 572                 $this->mwGlobalsToUnset = [];
 573                 $this->restoreLoggers();
 574
 575                 if ( self::$serviceLocator && MediaWikiServices::getInstance() !== self::$serviceLocator ) {
 576                         MediaWikiServices::forceGlobalInstance( self::$serviceLocator );
 577                 }
 578
 579                 // TODO: move global state into MediaWikiServices
 580                 RequestContext::resetMain();
 581                 if ( session_id() !== '' ) {
 582                         session_write_close();
 583                         session_id( '' );
 584                 }
 585                 $wgRequest = new FauxRequest();
 586                 MediaWiki\Session\SessionManager::resetCache();
 587                 MediaWiki\Auth\AuthManager::resetCache();
 588
 589                 $phpErrorLevel = intval( ini_get( 'error_reporting' ) );
 590
 591                 if ( $phpErrorLevel !== $this->phpErrorLevel ) {
 592                         ini_set( 'error_reporting', $this->phpErrorLevel );
 593
 594                         $oldHex = strtoupper( dechex( $this->phpErrorLevel ) );
 595                         $newHex = strtoupper( dechex( $phpErrorLevel ) );
 596                         $message = "PHP error_reporting setting was left dirty: "
 597                                 . "was 0x$oldHex before test, 0x$newHex after test!";
 598
 599                         $this->fail( $message );
 600                 }
 601
 602                 parent::tearDown();
 603         }
 604
 605         /**
 606          * Make sure MediaWikiTestCase extending classes have called their
 607          * parent setUp method
 608          *
 609          * With strict coverage activated in PHP_CodeCoverage, this test would be
 610          * marked as risky without the following annotation (T152923).
 611          * @coversNothing
 612          */
 613         final public function testMediaWikiTestCaseParentSetupCalled() {
 614                 $this->assertArrayHasKey( 'setUp', $this->called,
 615                         static::class . '::setUp() must call parent::setUp()'
 616                 );
 617         }
 618
 619         /**
 620          * Sets a service, maintaining a stashed version of the previous service to be
 621          * restored in tearDown
 622          *
 623          * @since 1.27
 624          *
 625          * @param string $name
 626          * @param object $object
 627          */
 628         protected function setService( $name, $object ) {
 629                 // If we did not yet override the service locator, so so now.
 630                 if ( MediaWikiServices::getInstance() === self::$serviceLocator ) {
 631                         $this->overrideMwServices();
 632                 }
 633
 634                 MediaWikiServices::getInstance()->disableService( $name );
 635                 MediaWikiServices::getInstance()->redefineService(
 636                         $name,
 637                         function () use ( $object ) {
 638                                 return $object;
 639                         }
 640                 );
 641         }
 642
 643         /**
 644          * Sets a global, maintaining a stashed version of the previous global to be
 645          * restored in tearDown
 646          *
 647          * The key is added to the array of globals that will be reset afterwards
 648          * in the tearDown().
 649          *
 650          * @par Example
 651          * @code
 652          *     protected function setUp() {
 653          *         $this->setMwGlobals( 'wgRestrictStuff', true );
 654          *     }
 655          *
 656          *     function testFoo() {}
 657          *
 658          *     function testBar() {}
 659          *         $this->assertTrue( self::getX()->doStuff() );
 660          *
 661          *         $this->setMwGlobals( 'wgRestrictStuff', false );
 662          *         $this->assertTrue( self::getX()->doStuff() );
 663          *     }
 664          *
 665          *     function testQuux() {}
 666          * @endcode
 667          *
 668          * @param array|string $pairs Key to the global variable, or an array
 669          *  of key/value pairs.
 670          * @param mixed $value Value to set the global to (ignored
 671          *  if an array is given as first argument).
 672          *
 673          * @note To allow changes to global variables to take effect on global service instances,
 674          *       call overrideMwServices().
 675          *
 676          * @since 1.21
 677          */
 678         protected function setMwGlobals( $pairs, $value = null ) {
 679                 if ( is_string( $pairs ) ) {
 680                         $pairs = [ $pairs => $value ];
 681                 }
 682
 683                 $this->stashMwGlobals( array_keys( $pairs ) );
 684
 685                 foreach ( $pairs as $key => $value ) {
 686                         $GLOBALS[$key] = $value;
 687                 }
 688         }
 689
 690         /**
 691          * Check if we can back up a value by performing a shallow copy.
 692          * Values which fail this test are copied recursively.
 693          *
 694          * @param mixed $value
 695          * @return bool True if a shallow copy will do; false if a deep copy
 696          *  is required.
 697          */
 698         private static function canShallowCopy( $value ) {
 699                 if ( is_scalar( $value ) || $value === null ) {
 700                         return true;
 701                 }
 702                 if ( is_array( $value ) ) {
 703                         foreach ( $value as $subValue ) {
 704                                 if ( !is_scalar( $subValue ) && $subValue !== null ) {
 705                                         return false;
 706                                 }
 707                         }
 708                         return true;
 709                 }
 710                 return false;
 711         }
 712
 713         /**
 714          * Stashes the global, will be restored in tearDown()
 715          *
 716          * Individual test functions may override globals through the setMwGlobals() function
 717          * or directly. When directly overriding globals their keys should first be passed to this
 718          * method in setUp to avoid breaking global state for other tests
 719          *
 720          * That way all other tests are executed with the same settings (instead of using the
 721          * unreliable local settings for most tests and fix it only for some tests).
 722          *
 723          * @param array|string $globalKeys Key to the global variable, or an array of keys.
 724          *
 725          * @note To allow changes to global variables to take effect on global service instances,
 726          *       call overrideMwServices().
 727          *
 728          * @since 1.23
 729          */
 730         protected function stashMwGlobals( $globalKeys ) {
 731                 if ( is_string( $globalKeys ) ) {
 732                         $globalKeys = [ $globalKeys ];
 733                 }
 734
 735                 foreach ( $globalKeys as $globalKey ) {
 736                         // NOTE: make sure we only save the global once or a second call to
 737                         // setMwGlobals() on the same global would override the original
 738                         // value.
 739                         if (
 740                                 !array_key_exists( $globalKey, $this->mwGlobals ) &&
 741                                 !array_key_exists( $globalKey, $this->mwGlobalsToUnset )
 742                         ) {
 743                                 if ( !array_key_exists( $globalKey, $GLOBALS ) ) {
 744                                         $this->mwGlobalsToUnset[$globalKey] = $globalKey;
 745                                         continue;
 746                                 }
 747                                 // NOTE: we serialize then unserialize the value in case it is an object
 748                                 // this stops any objects being passed by reference. We could use clone
 749                                 // and if is_object but this does account for objects within objects!
 750                                 if ( self::canShallowCopy( $GLOBALS[$globalKey] ) ) {
 751                                         $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 752                                 } elseif (
 753                                         // Many MediaWiki types are safe to clone. These are the
 754                                         // ones that are most commonly stashed.
 755                                         $GLOBALS[$globalKey] instanceof Language ||
 756                                         $GLOBALS[$globalKey] instanceof User ||
 757                                         $GLOBALS[$globalKey] instanceof FauxRequest
 758                                 ) {
 759                                         $this->mwGlobals[$globalKey] = clone $GLOBALS[$globalKey];
 760                                 } elseif ( $this->containsClosure( $GLOBALS[$globalKey] ) ) {
 761                                         // Serializing Closure only gives a warning on HHVM while
 762                                         // it throws an Exception on Zend.
 763                                         // Workaround for https://github.com/facebook/hhvm/issues/6206
 764                                         $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 765                                 } else {
 766                                         try {
 767                                                 $this->mwGlobals[$globalKey] = unserialize( serialize( $GLOBALS[$globalKey] ) );
 768                                         } catch ( Exception $e ) {
 769                                                 $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 770                                         }
 771                                 }
 772                         }
 773                 }
 774         }
 775
 776         /**
 777          * @param mixed $var
 778          * @param int $maxDepth
 779          *
 780          * @return bool
 781          */
 782         private function containsClosure( $var, $maxDepth = 15 ) {
 783                 if ( $var instanceof Closure ) {
 784                         return true;
 785                 }
 786                 if ( !is_array( $var ) || $maxDepth === 0 ) {
 787                         return false;
 788                 }
 789
 790                 foreach ( $var as $value ) {
 791                         if ( $this->containsClosure( $value, $maxDepth - 1 ) ) {
 792                                 return true;
 793                         }
 794                 }
 795                 return false;
 796         }
 797
 798         /**
 799          * Merges the given values into a MW global array variable.
 800          * Useful for setting some entries in a configuration array, instead of
 801          * setting the entire array.
 802          *
 803          * @param string $name The name of the global, as in wgFooBar
 804          * @param array $values The array containing the entries to set in that global
 805          *
 806          * @throws MWException If the designated global is not an array.
 807          *
 808          * @note To allow changes to global variables to take effect on global service instances,
 809          *       call overrideMwServices().
 810          *
 811          * @since 1.21
 812          */
 813         protected function mergeMwGlobalArrayValue( $name, $values ) {
 814                 if ( !isset( $GLOBALS[$name] ) ) {
 815                         $merged = $values;
 816                 } else {
 817                         if ( !is_array( $GLOBALS[$name] ) ) {
 818                                 throw new MWException( "MW global $name is not an array." );
 819                         }
 820
 821                         // NOTE: do not use array_merge, it screws up for numeric keys.
 822                         $merged = $GLOBALS[$name];
 823                         foreach ( $values as $k => $v ) {
 824                                 $merged[$k] = $v;
 825                         }
 826                 }
 827
 828                 $this->setMwGlobals( $name, $merged );
 829         }
 830
 831         /**
 832          * Stashes the global instance of MediaWikiServices, and installs a new one,
 833          * allowing test cases to override settings and services.
 834          * The previous instance of MediaWikiServices will be restored on tearDown.
 835          *
 836          * @since 1.27
 837          *
 838          * @param Config $configOverrides Configuration overrides for the new MediaWikiServices instance.
 839          * @param callable[] $services An associative array of services to re-define. Keys are service
 840          *        names, values are callables.
 841          *
 842          * @return MediaWikiServices
 843          * @throws MWException
 844          */
 845         protected function overrideMwServices( Config $configOverrides = null, array $services = [] ) {
 846                 if ( !$configOverrides ) {
 847                         $configOverrides = new HashConfig();
 848                 }
 849
 850                 $oldInstance = MediaWikiServices::getInstance();
 851                 $oldConfigFactory = $oldInstance->getConfigFactory();
 852                 $oldLoadBalancerFactory = $oldInstance->getDBLoadBalancerFactory();
 853
 854                 $testConfig = self::makeTestConfig( null, $configOverrides );
 855                 $newInstance = new MediaWikiServices( $testConfig );
 856
 857                 // Load the default wiring from the specified files.
 858                 // NOTE: this logic mirrors the logic in MediaWikiServices::newInstance.
 859                 $wiringFiles = $testConfig->get( 'ServiceWiringFiles' );
 860                 $newInstance->loadWiringFiles( $wiringFiles );
 861
 862                 // Provide a traditional hook point to allow extensions to configure services.
 863                 Hooks::run( 'MediaWikiServices', [ $newInstance ] );
 864
 865                 foreach ( $services as $name => $callback ) {
 866                         $newInstance->redefineService( $name, $callback );
 867                 }
 868
 869                 self::installTestServices(
 870                         $oldConfigFactory,
 871                         $oldLoadBalancerFactory,
 872                         $newInstance
 873                 );
 874                 MediaWikiServices::forceGlobalInstance( $newInstance );
 875
 876                 return $newInstance;
 877         }
 878
 879         /**
 880          * @since 1.27
 881          * @param string|Language $lang
 882          */
 883         public function setUserLang( $lang ) {
 884                 RequestContext::getMain()->setLanguage( $lang );
 885                 $this->setMwGlobals( 'wgLang', RequestContext::getMain()->getLanguage() );
 886         }
 887
 888         /**
 889          * @since 1.27
 890          * @param string|Language $lang
 891          */
 892         public function setContentLang( $lang ) {
 893                 if ( $lang instanceof Language ) {
 894                         $langCode = $lang->getCode();
 895                         $langObj = $lang;
 896                 } else {
 897                         $langCode = $lang;
 898                         $langObj = Language::factory( $langCode );
 899                 }
 900                 $this->setMwGlobals( [
 901                         'wgLanguageCode' => $langCode,
 902                         'wgContLang' => $langObj,
 903                 ] );
 904         }
 905
 906         /**
 907          * Alters $wgGroupPermissions for the duration of the test.  Can be called
 908          * with an array, like
 909          *   [ '*' => [ 'read' => false ], 'user' => [ 'read' => false ] ]
 910          * or three values to set a single permission, like
 911          *   $this->setGroupPermissions( '*', 'read', false );
 912          *
 913          * @since 1.31
 914          * @param array|string $newPerms Either an array of permissions to change,
 915          *   in which case the next two parameters are ignored; or a single string
 916          *   identifying a group, to use with the next two parameters.
 917          * @param string|null $newKey
 918          * @param mixed $newValue
 919          */
 920         public function setGroupPermissions( $newPerms, $newKey = null, $newValue = null ) {
 921                 global $wgGroupPermissions;
 922
 923                 $this->stashMwGlobals( 'wgGroupPermissions' );
 924
 925                 if ( is_string( $newPerms ) ) {
 926                         $newPerms = [ $newPerms => [ $newKey => $newValue ] ];
 927                 }
 928
 929                 foreach ( $newPerms as $group => $permissions ) {
 930                         foreach ( $permissions as $key => $value ) {
 931                                 $wgGroupPermissions[$group][$key] = $value;
 932                         }
 933                 }
 934         }
 935
 936         /**
 937          * Sets the logger for a specified channel, for the duration of the test.
 938          * @since 1.27
 939          * @param string $channel
 940          * @param LoggerInterface $logger
 941          */
 942         protected function setLogger( $channel, LoggerInterface $logger ) {
 943                 // TODO: Once loggers are managed by MediaWikiServices, use
 944                 //       overrideMwServices() to set loggers.
 945
 946                 $provider = LoggerFactory::getProvider();
 947                 $wrappedProvider = TestingAccessWrapper::newFromObject( $provider );
 948                 $singletons = $wrappedProvider->singletons;
 949                 if ( $provider instanceof MonologSpi ) {
 950                         if ( !isset( $this->loggers[$channel] ) ) {
 951                                 $this->loggers[$channel] = isset( $singletons['loggers'][$channel] )
 952                                         ? $singletons['loggers'][$channel] : null;
 953                         }
 954                         $singletons['loggers'][$channel] = $logger;
 955                 } elseif ( $provider instanceof LegacySpi ) {
 956                         if ( !isset( $this->loggers[$channel] ) ) {
 957                                 $this->loggers[$channel] = isset( $singletons[$channel] ) ? $singletons[$channel] : null;
 958                         }
 959                         $singletons[$channel] = $logger;
 960                 } else {
 961                         throw new LogicException( __METHOD__ . ': setting a logger for ' . get_class( $provider )
 962                                 . ' is not implemented' );
 963                 }
 964                 $wrappedProvider->singletons = $singletons;
 965         }
 966
 967         /**
 968          * Restores loggers replaced by setLogger().
 969          * @since 1.27
 970          */
 971         private function restoreLoggers() {
 972                 $provider = LoggerFactory::getProvider();
 973                 $wrappedProvider = TestingAccessWrapper::newFromObject( $provider );
 974                 $singletons = $wrappedProvider->singletons;
 975                 foreach ( $this->loggers as $channel => $logger ) {
 976                         if ( $provider instanceof MonologSpi ) {
 977                                 if ( $logger === null ) {
 978                                         unset( $singletons['loggers'][$channel] );
 979                                 } else {
 980                                         $singletons['loggers'][$channel] = $logger;
 981                                 }
 982                         } elseif ( $provider instanceof LegacySpi ) {
 983                                 if ( $logger === null ) {
 984                                         unset( $singletons[$channel] );
 985                                 } else {
 986                                         $singletons[$channel] = $logger;
 987                                 }
 988                         }
 989                 }
 990                 $wrappedProvider->singletons = $singletons;
 991                 $this->loggers = [];
 992         }
 993
 994         /**
 995          * @return string
 996          * @since 1.18
 997          */
 998         public function dbPrefix() {
 999                 return $this->db->getType() == 'oracle' ? self::ORA_DB_PREFIX : self::DB_PREFIX;
1000         }
1001
1002         /**
1003          * @return bool
1004          * @since 1.18
1005          */
1006         public function needsDB() {
1007                 // If the test says it uses database tables, it needs the database
1008                 if ( $this->tablesUsed ) {
1009                         return true;
1010                 }
1011
1012                 // If the test class says it belongs to the Database group, it needs the database.
1013                 // NOTE: This ONLY checks for the group in the class level doc comment.
1014                 $rc = new ReflectionClass( $this );
1015                 if ( preg_match( '/@group +Database/im', $rc->getDocComment() ) ) {
1016                         return true;
1017                 }
1018
1019                 return false;
1020         }
1021
1022         /**
1023          * Insert a new page.
1024          *
1025          * Should be called from addDBData().
1026          *
1027          * @since 1.25 ($namespace in 1.28)
1028          * @param string|title $pageName Page name or title
1029          * @param string $text Page's content
1030          * @param int $namespace Namespace id (name cannot already contain namespace)
1031          * @return array Title object and page id
1032          */
1033         protected function insertPage(
1034                 $pageName,
1035                 $text = 'Sample page for unit test.',
1036                 $namespace = null
1037         ) {
1038                 if ( is_string( $pageName ) ) {
1039                         $title = Title::newFromText( $pageName, $namespace );
1040                 } else {
1041                         $title = $pageName;
1042                 }
1043
1044                 $user = static::getTestSysop()->getUser();
1045                 $comment = __METHOD__ . ': Sample page for unit test.';
1046
1047                 $page = WikiPage::factory( $title );
1048                 $page->doEditContent( ContentHandler::makeContent( $text, $title ), $comment, 0, false, $user );
1049
1050                 return [
1051                         'title' => $title,
1052                         'id' => $page->getId(),
1053                 ];
1054         }
1055
1056         /**
1057          * Stub. If a test suite needs to add additional data to the database, it should
1058          * implement this method and do so. This method is called once per test suite
1059          * (i.e. once per class).
1060          *
1061          * Note data added by this method may be removed by resetDB() depending on
1062          * the contents of $tablesUsed.
1063          *
1064          * To add additional data between test function runs, override prepareDB().
1065          *
1066          * @see addDBData()
1067          * @see resetDB()
1068          *
1069          * @since 1.27
1070          */
1071         public function addDBDataOnce() {
1072         }
1073
1074         /**
1075          * Stub. Subclasses may override this to prepare the database.
1076          * Called before every test run (test function or data set).
1077          *
1078          * @see addDBDataOnce()
1079          * @see resetDB()
1080          *
1081          * @since 1.18
1082          */
1083         public function addDBData() {
1084         }
1085
1086         private function addCoreDBData() {
1087                 if ( $this->db->getType() == 'oracle' ) {
1088                         # Insert 0 user to prevent FK violations
1089                         # Anonymous user
1090                         if ( !$this->db->selectField( 'user', '1', [ 'user_id' => 0 ] ) ) {
1091                                 $this->db->insert( 'user', [
1092                                         'user_id' => 0,
1093                                         'user_name' => 'Anonymous' ], __METHOD__, [ 'IGNORE' ] );
1094                         }
1095
1096                         # Insert 0 page to prevent FK violations
1097                         # Blank page
1098                         if ( !$this->db->selectField( 'page', '1', [ 'page_id' => 0 ] ) ) {
1099                                 $this->db->insert( 'page', [
1100                                         'page_id' => 0,
1101                                         'page_namespace' => 0,
1102                                         'page_title' => ' ',
1103                                         'page_restrictions' => null,
1104                                         'page_is_redirect' => 0,
1105                                         'page_is_new' => 0,
1106                                         'page_random' => 0,
1107                                         'page_touched' => $this->db->timestamp(),
1108                                         'page_latest' => 0,
1109                                         'page_len' => 0 ], __METHOD__, [ 'IGNORE' ] );
1110                         }
1111                 }
1112
1113                 SiteStatsInit::doPlaceholderInit();
1114
1115                 User::resetIdByNameCache();
1116
1117                 // Make sysop user
1118                 $user = static::getTestSysop()->getUser();
1119
1120                 // Make 1 page with 1 revision
1121                 $page = WikiPage::factory( Title::newFromText( 'UTPage' ) );
1122                 if ( $page->getId() == 0 ) {
1123                         $page->doEditContent(
1124                                 new WikitextContent( 'UTContent' ),
1125                                 'UTPageSummary',
1126                                 EDIT_NEW | EDIT_SUPPRESS_RC,
1127                                 false,
1128                                 $user
1129                         );
1130                         // an edit always attempt to purge backlink links such as history
1131                         // pages. That is unneccessary.
1132                         JobQueueGroup::singleton()->get( 'htmlCacheUpdate' )->delete();
1133                         // WikiPages::doEditUpdates randomly adds RC purges
1134                         JobQueueGroup::singleton()->get( 'recentChangesUpdate' )->delete();
1135
1136                         // doEditContent() probably started the session via
1137                         // User::loadFromSession(). Close it now.
1138                         if ( session_id() !== '' ) {
1139                                 session_write_close();
1140                                 session_id( '' );
1141                         }
1142                 }
1143         }
1144
1145         /**
1146          * Restores MediaWiki to using the table set (table prefix) it was using before
1147          * setupTestDB() was called. Useful if we need to perform database operations
1148          * after the test run has finished (such as saving logs or profiling info).
1149          *
1150          * @since 1.21
1151          */
1152         public static function teardownTestDB() {
1153                 global $wgJobClasses;
1154
1155                 if ( !self::$dbSetup ) {
1156                         return;
1157                 }
1158
1159                 Hooks::run( 'UnitTestsBeforeDatabaseTeardown' );
1160
1161                 foreach ( $wgJobClasses as $type => $class ) {
1162                         // Delete any jobs under the clone DB (or old prefix in other stores)
1163                         JobQueueGroup::singleton()->get( $type )->delete();
1164                 }
1165
1166                 CloneDatabase::changePrefix( self::$oldTablePrefix );
1167
1168                 self::$oldTablePrefix = false;
1169                 self::$dbSetup = false;
1170         }
1171
1172         /**
1173          * Setups a database with the given prefix.
1174          *
1175          * If reuseDB is true and certain conditions apply, it will just change the prefix.
1176          * Otherwise, it will clone the tables and change the prefix.
1177          *
1178          * Clones all tables in the given database (whatever database that connection has
1179          * open), to versions with the test prefix.
1180          *
1181          * @param IMaintainableDatabase $db Database to use
1182          * @param string $prefix Prefix to use for test tables
1183          * @return bool True if tables were cloned, false if only the prefix was changed
1184          */
1185         protected static function setupDatabaseWithTestPrefix( IMaintainableDatabase $db, $prefix ) {
1186                 $tablesCloned = self::listTables( $db );
1187                 $dbClone = new CloneDatabase( $db, $tablesCloned, $prefix );
1188                 $dbClone->useTemporaryTables( self::$useTemporaryTables );
1189
1190                 $db->_originalTablePrefix = $db->tablePrefix();
1191
1192                 if ( ( $db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
1193                         CloneDatabase::changePrefix( $prefix );
1194
1195                         return false;
1196                 } else {
1197                         $dbClone->cloneTableStructure();
1198                         return true;
1199                 }
1200         }
1201
1202         /**
1203          * Set up all test DBs
1204          */
1205         public function setupAllTestDBs() {
1206                 global $wgDBprefix;
1207
1208                 self::$oldTablePrefix = $wgDBprefix;
1209
1210                 $testPrefix = $this->dbPrefix();
1211
1212                 // switch to a temporary clone of the database
1213                 self::setupTestDB( $this->db, $testPrefix );
1214
1215                 if ( self::isUsingExternalStoreDB() ) {
1216                         self::setupExternalStoreTestDBs( $testPrefix );
1217                 }
1218         }
1219
1220         /**
1221          * Creates an empty skeleton of the wiki database by cloning its structure
1222          * to equivalent tables using the given $prefix. Then sets MediaWiki to
1223          * use the new set of tables (aka schema) instead of the original set.
1224          *
1225          * This is used to generate a dummy table set, typically consisting of temporary
1226          * tables, that will be used by tests instead of the original wiki database tables.
1227          *
1228          * @since 1.21
1229          *
1230          * @note the original table prefix is stored in self::$oldTablePrefix. This is used
1231          * by teardownTestDB() to return the wiki to using the original table set.
1232          *
1233          * @note this method only works when first called. Subsequent calls have no effect,
1234          * even if using different parameters.
1235          *
1236          * @param Database $db The database connection
1237          * @param string $prefix The prefix to use for the new table set (aka schema).
1238          *
1239          * @throws MWException If the database table prefix is already $prefix
1240          */
1241         public static function setupTestDB( Database $db, $prefix ) {
1242                 if ( self::$dbSetup ) {
1243                         return;
1244                 }
1245
1246                 if ( $db->tablePrefix() === $prefix ) {
1247                         throw new MWException(
1248                                 'Cannot run unit tests, the database prefix is already "' . $prefix . '"' );
1249                 }
1250
1251                 // TODO: the below should be re-written as soon as LBFactory, LoadBalancer,
1252                 // and Database no longer use global state.
1253
1254                 self::$dbSetup = true;
1255
1256                 if ( !self::setupDatabaseWithTestPrefix( $db, $prefix ) ) {
1257                         return;
1258                 }
1259
1260                 // Assuming this isn't needed for External Store database, and not sure if the procedure
1261                 // would be available there.
1262                 if ( $db->getType() == 'oracle' ) {
1263                         $db->query( 'BEGIN FILL_WIKI_INFO; END;' );
1264                 }
1265
1266                 Hooks::run( 'UnitTestsAfterDatabaseSetup', [ $db, $prefix ] );
1267         }
1268
1269         /**
1270          * Clones the External Store database(s) for testing
1271          *
1272          * @param string $testPrefix Prefix for test tables
1273          */
1274         protected static function setupExternalStoreTestDBs( $testPrefix ) {
1275                 $connections = self::getExternalStoreDatabaseConnections();
1276                 foreach ( $connections as $dbw ) {
1277                         // Hack: cloneTableStructure sets $wgDBprefix to the unit test
1278                         // prefix,.  Even though listTables now uses tablePrefix, that
1279                         // itself is populated from $wgDBprefix by default.
1280
1281                         // We have to set it back, or we won't find the original 'blobs'
1282                         // table to copy.
1283
1284                         $dbw->tablePrefix( self::$oldTablePrefix );
1285                         self::setupDatabaseWithTestPrefix( $dbw, $testPrefix );
1286                 }
1287         }
1288
1289         /**
1290          * Gets master database connections for all of the ExternalStoreDB
1291          * stores configured in $wgDefaultExternalStore.
1292          *
1293          * @return Database[] Array of Database master connections
1294          */
1295         protected static function getExternalStoreDatabaseConnections() {
1296                 global $wgDefaultExternalStore;
1297
1298                 /** @var ExternalStoreDB $externalStoreDB */
1299                 $externalStoreDB = ExternalStore::getStoreObject( 'DB' );
1300                 $defaultArray = (array)$wgDefaultExternalStore;
1301                 $dbws = [];
1302                 foreach ( $defaultArray as $url ) {
1303                         if ( strpos( $url, 'DB://' ) === 0 ) {
1304                                 list( $proto, $cluster ) = explode( '://', $url, 2 );
1305                                 // Avoid getMaster() because setupDatabaseWithTestPrefix()
1306                                 // requires Database instead of plain DBConnRef/IDatabase
1307                                 $dbws[] = $externalStoreDB->getMaster( $cluster );
1308                         }
1309                 }
1310
1311                 return $dbws;
1312         }
1313
1314         /**
1315          * Check whether ExternalStoreDB is being used
1316          *
1317          * @return bool True if it's being used
1318          */
1319         protected static function isUsingExternalStoreDB() {
1320                 global $wgDefaultExternalStore;
1321                 if ( !$wgDefaultExternalStore ) {
1322                         return false;
1323                 }
1324
1325                 $defaultArray = (array)$wgDefaultExternalStore;
1326                 foreach ( $defaultArray as $url ) {
1327                         if ( strpos( $url, 'DB://' ) === 0 ) {
1328                                 return true;
1329                         }
1330                 }
1331
1332                 return false;
1333         }
1334
1335         /**
1336          * @throws LogicException if the given database connection is not a set up to use
1337          * mock tables.
1338          */
1339         private function ensureMockDatabaseConnection( IDatabase $db ) {
1340                 if ( $db->tablePrefix() !== $this->dbPrefix() ) {
1341                         throw new LogicException(
1342                                 'Trying to delete mock tables, but table prefix does not indicate a mock database.'
1343                         );
1344                 }
1345         }
1346
1347         private static $schemaOverrideDefaults = [
1348                 'scripts' => [],
1349                 'create' => [],
1350                 'drop' => [],
1351                 'alter' => [],
1352         ];
1353
1354         /**
1355          * Stub. If a test suite needs to test against a specific database schema, it should
1356          * override this method and return the appropriate information from it.
1357          *
1358          * @param IMaintainableDatabase $db The DB connection to use for the mock schema.
1359          *        May be used to check the current state of the schema, to determine what
1360          *        overrides are needed.
1361          *
1362          * @return array An associative array with the following fields:
1363          *  - 'scripts': any SQL scripts to run. If empty or not present, schema overrides are skipped.
1364          * - 'create': A list of tables created (may or may not exist in the original schema).
1365          * - 'drop': A list of tables dropped (expected to be present in the original schema).
1366          * - 'alter': A list of tables altered (expected to be present in the original schema).
1367          */
1368         protected function getSchemaOverrides( IMaintainableDatabase $db ) {
1369                 return [];
1370         }
1371
1372         /**
1373          * Undoes the dpecified schema overrides..
1374          * Called once per test class, just before addDataOnce().
1375          *
1376          * @param IMaintainableDatabase $db
1377          * @param array $oldOverrides
1378          */
1379         private function undoSchemaOverrides( IMaintainableDatabase $db, $oldOverrides ) {
1380                 $this->ensureMockDatabaseConnection( $db );
1381
1382                 $oldOverrides = $oldOverrides + self::$schemaOverrideDefaults;
1383                 $originalTables = $this->listOriginalTables( $db );
1384
1385                 // Drop tables that need to be restored or removed.
1386                 $tablesToDrop = array_merge( $oldOverrides['create'], $oldOverrides['alter'] );
1387
1388                 // Restore tables that have been dropped or created or altered,
1389                 // if they exist in the original schema.
1390                 $tablesToRestore = array_merge( $tablesToDrop, $oldOverrides['drop'] );
1391                 $tablesToRestore = array_intersect( $originalTables, $tablesToRestore );
1392
1393                 if ( $tablesToDrop ) {
1394                         $this->dropMockTables( $db, $tablesToDrop );
1395                 }
1396
1397                 if ( $tablesToRestore ) {
1398                         $this->recloneMockTables( $db, $tablesToRestore );
1399                 }
1400         }
1401
1402         /**
1403          * Applies the schema overrides returned by getSchemaOverrides(),
1404          * after undoing any previously applied schema overrides.
1405          * Called once per test class, just before addDataOnce().
1406          */
1407         private function setUpSchema( IMaintainableDatabase $db ) {
1408                 // Undo any active overrides.
1409                 $oldOverrides = isset( $db->_schemaOverrides ) ? $db->_schemaOverrides
1410                         : self::$schemaOverrideDefaults;
1411
1412                 if ( $oldOverrides['alter'] || $oldOverrides['create'] || $oldOverrides['drop'] ) {
1413                         $this->undoSchemaOverrides( $db, $oldOverrides );
1414                 }
1415
1416                 // Determine new overrides.
1417                 $overrides = $this->getSchemaOverrides( $db ) + self::$schemaOverrideDefaults;
1418
1419                 $extraKeys = array_diff(
1420                         array_keys( $overrides ),
1421                         array_keys( self::$schemaOverrideDefaults )
1422                 );
1423
1424                 if ( $extraKeys ) {
1425                         throw new InvalidArgumentException(
1426                                 'Schema override contains extra keys: ' . var_export( $extraKeys, true )
1427                         );
1428                 }
1429
1430                 if ( !$overrides['scripts'] ) {
1431                         // no scripts to run
1432                         return;
1433                 }
1434
1435                 if ( !$overrides['create'] && !$overrides['drop'] && !$overrides['alter'] ) {
1436                         throw new InvalidArgumentException(
1437                                 'Schema override scripts given, but no tables are declared to be '
1438                                 . 'created, dropped or altered.'
1439                         );
1440                 }
1441
1442                 $this->ensureMockDatabaseConnection( $db );
1443
1444                 // Drop the tables that will be created by the schema scripts.
1445                 $originalTables = $this->listOriginalTables( $db );
1446                 $tablesToDrop = array_intersect( $originalTables, $overrides['create'] );
1447
1448                 if ( $tablesToDrop ) {
1449                         $this->dropMockTables( $db, $tablesToDrop );
1450                 }
1451
1452                 // Run schema override scripts.
1453                 foreach ( $overrides['scripts'] as $script ) {
1454                         $db->sourceFile(
1455                                 $script,
1456                                 null,
1457                                 null,
1458                                 __METHOD__,
1459                                 function ( $cmd ) {
1460                                         return $this->mungeSchemaUpdateQuery( $cmd );
1461                                 }
1462                         );
1463                 }
1464
1465                 $db->_schemaOverrides = $overrides;
1466         }
1467
1468         private function mungeSchemaUpdateQuery( $cmd ) {
1469                 return self::$useTemporaryTables
1470                         ? preg_replace( '/\bCREATE\s+TABLE\b/i', 'CREATE TEMPORARY TABLE', $cmd )
1471                         : $cmd;
1472         }
1473
1474         /**
1475          * Drops the given mock tables.
1476          *
1477          * @param IMaintainableDatabase $db
1478          * @param array $tables
1479          */
1480         private function dropMockTables( IMaintainableDatabase $db, array $tables ) {
1481                 $this->ensureMockDatabaseConnection( $db );
1482
1483                 foreach ( $tables as $tbl ) {
1484                         $tbl = $db->tableName( $tbl );
1485                         $db->query( "DROP TABLE IF EXISTS $tbl", __METHOD__ );
1486
1487                         if ( $tbl === 'page' ) {
1488                                 // Forget about the pages since they don't
1489                                 // exist in the DB.
1490                                 LinkCache::singleton()->clear();
1491                         }
1492                 }
1493         }
1494
1495         /**
1496          * Lists all tables in the live database schema.
1497          *
1498          * @param IMaintainableDatabase $db
1499          * @return array
1500          */
1501         private function listOriginalTables( IMaintainableDatabase $db ) {
1502                 if ( !isset( $db->_originalTablePrefix ) ) {
1503                         throw new LogicException( 'No original table prefix know, cannot list tables!' );
1504                 }
1505
1506                 $originalTables = $db->listTables( $db->_originalTablePrefix, __METHOD__ );
1507                 return $originalTables;
1508         }
1509
1510         /**
1511          * Re-clones the given mock tables to restore them based on the live database schema.
1512          * The tables listed in $tables are expected to currently not exist, so dropMockTables()
1513          * should be called first.
1514          *
1515          * @param IMaintainableDatabase $db
1516          * @param array $tables
1517          */
1518         private function recloneMockTables( IMaintainableDatabase $db, array $tables ) {
1519                 $this->ensureMockDatabaseConnection( $db );
1520
1521                 if ( !isset( $db->_originalTablePrefix ) ) {
1522                         throw new LogicException( 'No original table prefix know, cannot restore tables!' );
1523                 }
1524
1525                 $originalTables = $this->listOriginalTables( $db );
1526                 $tables = array_intersect( $tables, $originalTables );
1527
1528                 $dbClone = new CloneDatabase( $db, $tables, $db->tablePrefix(), $db->_originalTablePrefix );
1529                 $dbClone->useTemporaryTables( self::$useTemporaryTables );
1530
1531                 $dbClone->cloneTableStructure();
1532         }
1533
1534         /**
1535          * Empty all tables so they can be repopulated for tests
1536          *
1537          * @param Database $db|null Database to reset
1538          * @param array $tablesUsed Tables to reset
1539          */
1540         private function resetDB( $db, $tablesUsed ) {
1541                 if ( $db ) {
1542                         $userTables = [ 'user', 'user_groups', 'user_properties', 'actor' ];
1543                         $pageTables = [ 'page', 'revision', 'ip_changes', 'revision_comment_temp',
1544                                 'revision_actor_temp', 'comment' ];
1545                         $coreDBDataTables = array_merge( $userTables, $pageTables );
1546
1547                         // If any of the user or page tables were marked as used, we should clear all of them.
1548                         if ( array_intersect( $tablesUsed, $userTables ) ) {
1549                                 $tablesUsed = array_unique( array_merge( $tablesUsed, $userTables ) );
1550                                 TestUserRegistry::clear();
1551                         }
1552                         if ( array_intersect( $tablesUsed, $pageTables ) ) {
1553                                 $tablesUsed = array_unique( array_merge( $tablesUsed, $pageTables ) );
1554                         }
1555
1556                         $truncate = in_array( $db->getType(), [ 'oracle', 'mysql' ] );
1557                         foreach ( $tablesUsed as $tbl ) {
1558                                 // TODO: reset interwiki table to its original content.
1559                                 if ( $tbl == 'interwiki' ) {
1560                                         continue;
1561                                 }
1562
1563                                 if ( !$db->tableExists( $tbl ) ) {
1564                                         continue;
1565                                 }
1566
1567                                 if ( $truncate ) {
1568                                         $db->query( 'TRUNCATE TABLE ' . $db->tableName( $tbl ), __METHOD__ );
1569                                 } else {
1570                                         $db->delete( $tbl, '*', __METHOD__ );
1571                                 }
1572
1573                                 if ( $db->getType() === 'postgres' ) {
1574                                         // Reset the table's sequence too.
1575                                         $db->resetSequenceForTable( $tbl, __METHOD__ );
1576                                 }
1577
1578                                 if ( $tbl === 'page' ) {
1579                                         // Forget about the pages since they don't
1580                                         // exist in the DB.
1581                                         LinkCache::singleton()->clear();
1582                                 }
1583                         }
1584
1585                         if ( array_intersect( $tablesUsed, $coreDBDataTables ) ) {
1586                                 // Re-add core DB data that was deleted
1587                                 $this->addCoreDBData();
1588                         }
1589                 }
1590         }
1591
1592         private static function unprefixTable( &$tableName, $ind, $prefix ) {
1593                 $tableName = substr( $tableName, strlen( $prefix ) );
1594         }
1595
1596         private static function isNotUnittest( $table ) {
1597                 return strpos( $table, self::DB_PREFIX ) !== 0;
1598         }
1599
1600         /**
1601          * @since 1.18
1602          *
1603          * @param IMaintainableDatabase $db
1604          *
1605          * @return array
1606          */
1607         public static function listTables( IMaintainableDatabase $db ) {
1608                 $prefix = $db->tablePrefix();
1609                 $tables = $db->listTables( $prefix, __METHOD__ );
1610
1611                 if ( $db->getType() === 'mysql' ) {
1612                         static $viewListCache = null;
1613                         if ( $viewListCache === null ) {
1614                                 $viewListCache = $db->listViews( null, __METHOD__ );
1615                         }
1616                         // T45571: cannot clone VIEWs under MySQL
1617                         $tables = array_diff( $tables, $viewListCache );
1618                 }
1619                 array_walk( $tables, [ __CLASS__, 'unprefixTable' ], $prefix );
1620
1621                 // Don't duplicate test tables from the previous fataled run
1622                 $tables = array_filter( $tables, [ __CLASS__, 'isNotUnittest' ] );
1623
1624                 if ( $db->getType() == 'sqlite' ) {
1625                         $tables = array_flip( $tables );
1626                         // these are subtables of searchindex and don't need to be duped/dropped separately
1627                         unset( $tables['searchindex_content'] );
1628                         unset( $tables['searchindex_segdir'] );
1629                         unset( $tables['searchindex_segments'] );
1630                         $tables = array_flip( $tables );
1631                 }
1632
1633                 return $tables;
1634         }
1635
1636         /**
1637          * @throws MWException
1638          * @since 1.18
1639          */
1640         protected function checkDbIsSupported() {
1641                 if ( !in_array( $this->db->getType(), $this->supportedDBs ) ) {
1642                         throw new MWException( $this->db->getType() . " is not currently supported for unit testing." );
1643                 }
1644         }
1645
1646         /**
1647          * @since 1.18
1648          * @param string $offset
1649          * @return mixed
1650          */
1651         public function getCliArg( $offset ) {
1652                 if ( isset( PHPUnitMaintClass::$additionalOptions[$offset] ) ) {
1653                         return PHPUnitMaintClass::$additionalOptions[$offset];
1654                 }
1655
1656                 return null;
1657         }
1658
1659         /**
1660          * @since 1.18
1661          * @param string $offset
1662          * @param mixed $value
1663          */
1664         public function setCliArg( $offset, $value ) {
1665                 PHPUnitMaintClass::$additionalOptions[$offset] = $value;
1666         }
1667
1668         /**
1669          * Don't throw a warning if $function is deprecated and called later
1670          *
1671          * @since 1.19
1672          *
1673          * @param string $function
1674          */
1675         public function hideDeprecated( $function ) {
1676                 Wikimedia\suppressWarnings();
1677                 wfDeprecated( $function );
1678                 Wikimedia\restoreWarnings();
1679         }
1680
1681         /**
1682          * Asserts that the given database query yields the rows given by $expectedRows.
1683          * The expected rows should be given as indexed (not associative) arrays, with
1684          * the values given in the order of the columns in the $fields parameter.
1685          * Note that the rows are sorted by the columns given in $fields.
1686          *
1687          * @since 1.20
1688          *
1689          * @param string|array $table The table(s) to query
1690          * @param string|array $fields The columns to include in the result (and to sort by)
1691          * @param string|array $condition "where" condition(s)
1692          * @param array $expectedRows An array of arrays giving the expected rows.
1693          * @param array $options Options for the query
1694          * @param array $join_conds Join conditions for the query
1695          *
1696          * @throws MWException If this test cases's needsDB() method doesn't return true.
1697          *         Test cases can use "@group Database" to enable database test support,
1698          *         or list the tables under testing in $this->tablesUsed, or override the
1699          *         needsDB() method.
1700          */
1701         protected function assertSelect(
1702                 $table, $fields, $condition, array $expectedRows, array $options = [], array $join_conds = []
1703         ) {
1704                 if ( !$this->needsDB() ) {
1705                         throw new MWException( 'When testing database state, the test cases\'s needDB()' .
1706                                 ' method should return true. Use @group Database or $this->tablesUsed.' );
1707                 }
1708
1709                 $db = wfGetDB( DB_REPLICA );
1710
1711                 $res = $db->select(
1712                         $table,
1713                         $fields,
1714                         $condition,
1715                         wfGetCaller(),
1716                         $options + [ 'ORDER BY' => $fields ],
1717                         $join_conds
1718                 );
1719                 $this->assertNotEmpty( $res, "query failed: " . $db->lastError() );
1720
1721                 $i = 0;
1722
1723                 foreach ( $expectedRows as $expected ) {
1724                         $r = $res->fetchRow();
1725                         self::stripStringKeys( $r );
1726
1727                         $i += 1;
1728                         $this->assertNotEmpty( $r, "row #$i missing" );
1729
1730                         $this->assertEquals( $expected, $r, "row #$i mismatches" );
1731                 }
1732
1733                 $r = $res->fetchRow();
1734                 self::stripStringKeys( $r );
1735
1736                 $this->assertFalse( $r, "found extra row (after #$i)" );
1737         }
1738
1739         /**
1740          * Utility method taking an array of elements and wrapping
1741          * each element in its own array. Useful for data providers
1742          * that only return a single argument.
1743          *
1744          * @since 1.20
1745          *
1746          * @param array $elements
1747          *
1748          * @return array
1749          */
1750         protected function arrayWrap( array $elements ) {
1751                 return array_map(
1752                         function ( $element ) {
1753                                 return [ $element ];
1754                         },
1755                         $elements
1756                 );
1757         }
1758
1759         /**
1760          * Assert that two arrays are equal. By default this means that both arrays need to hold
1761          * the same set of values. Using additional arguments, order and associated key can also
1762          * be set as relevant.
1763          *
1764          * @since 1.20
1765          *
1766          * @param array $expected
1767          * @param array $actual
1768          * @param bool $ordered If the order of the values should match
1769          * @param bool $named If the keys should match
1770          */
1771         protected function assertArrayEquals( array $expected, array $actual,
1772                 $ordered = false, $named = false
1773         ) {
1774                 if ( !$ordered ) {
1775                         $this->objectAssociativeSort( $expected );
1776                         $this->objectAssociativeSort( $actual );
1777                 }
1778
1779                 if ( !$named ) {
1780                         $expected = array_values( $expected );
1781                         $actual = array_values( $actual );
1782                 }
1783
1784                 call_user_func_array(
1785                         [ $this, 'assertEquals' ],
1786                         array_merge( [ $expected, $actual ], array_slice( func_get_args(), 4 ) )
1787                 );
1788         }
1789
1790         /**
1791          * Put each HTML element on its own line and then equals() the results
1792          *
1793          * Use for nicely formatting of PHPUnit diff output when comparing very
1794          * simple HTML
1795          *
1796          * @since 1.20
1797          *
1798          * @param string $expected HTML on oneline
1799          * @param string $actual HTML on oneline
1800          * @param string $msg Optional message
1801          */
1802         protected function assertHTMLEquals( $expected, $actual, $msg = '' ) {
1803                 $expected = str_replace( '>', ">\n", $expected );
1804                 $actual = str_replace( '>', ">\n", $actual );
1805
1806                 $this->assertEquals( $expected, $actual, $msg );
1807         }
1808
1809         /**
1810          * Does an associative sort that works for objects.
1811          *
1812          * @since 1.20
1813          *
1814          * @param array &$array
1815          */
1816         protected function objectAssociativeSort( array &$array ) {
1817                 uasort(
1818                         $array,
1819                         function ( $a, $b ) {
1820                                 return serialize( $a ) > serialize( $b ) ? 1 : -1;
1821                         }
1822                 );
1823         }
1824
1825         /**
1826          * Utility function for eliminating all string keys from an array.
1827          * Useful to turn a database result row as returned by fetchRow() into
1828          * a pure indexed array.
1829          *
1830          * @since 1.20
1831          *
1832          * @param mixed &$r The array to remove string keys from.
1833          */
1834         protected static function stripStringKeys( &$r ) {
1835                 if ( !is_array( $r ) ) {
1836                         return;
1837                 }
1838
1839                 foreach ( $r as $k => $v ) {
1840                         if ( is_string( $k ) ) {
1841                                 unset( $r[$k] );
1842                         }
1843                 }
1844         }
1845
1846         /**
1847          * Asserts that the provided variable is of the specified
1848          * internal type or equals the $value argument. This is useful
1849          * for testing return types of functions that return a certain
1850          * type or *value* when not set or on error.
1851          *
1852          * @since 1.20
1853          *
1854          * @param string $type
1855          * @param mixed $actual
1856          * @param mixed $value
1857          * @param string $message
1858          */
1859         protected function assertTypeOrValue( $type, $actual, $value = false, $message = '' ) {
1860                 if ( $actual === $value ) {
1861                         $this->assertTrue( true, $message );
1862                 } else {
1863                         $this->assertType( $type, $actual, $message );
1864                 }
1865         }
1866
1867         /**
1868          * Asserts the type of the provided value. This can be either
1869          * in internal type such as boolean or integer, or a class or
1870          * interface the value extends or implements.
1871          *
1872          * @since 1.20
1873          *
1874          * @param string $type
1875          * @param mixed $actual
1876          * @param string $message
1877          */
1878         protected function assertType( $type, $actual, $message = '' ) {
1879                 if ( class_exists( $type ) || interface_exists( $type ) ) {
1880                         $this->assertInstanceOf( $type, $actual, $message );
1881                 } else {
1882                         $this->assertInternalType( $type, $actual, $message );
1883                 }
1884         }
1885
1886         /**
1887          * Returns true if the given namespace defaults to Wikitext
1888          * according to $wgNamespaceContentModels
1889          *
1890          * @param int $ns The namespace ID to check
1891          *
1892          * @return bool
1893          * @since 1.21
1894          */
1895         protected function isWikitextNS( $ns ) {
1896                 global $wgNamespaceContentModels;
1897
1898                 if ( isset( $wgNamespaceContentModels[$ns] ) ) {
1899                         return $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT;
1900                 }
1901
1902                 return true;
1903         }
1904
1905         /**
1906          * Returns the ID of a namespace that defaults to Wikitext.
1907          *
1908          * @throws MWException If there is none.
1909          * @return int The ID of the wikitext Namespace
1910          * @since 1.21
1911          */
1912         protected function getDefaultWikitextNS() {
1913                 global $wgNamespaceContentModels;
1914
1915                 static $wikitextNS = null; // this is not going to change
1916                 if ( $wikitextNS !== null ) {
1917                         return $wikitextNS;
1918                 }
1919
1920                 // quickly short out on most common case:
1921                 if ( !isset( $wgNamespaceContentModels[NS_MAIN] ) ) {
1922                         return NS_MAIN;
1923                 }
1924
1925                 // NOTE: prefer content namespaces
1926                 $namespaces = array_unique( array_merge(
1927                         MWNamespace::getContentNamespaces(),
1928                         [ NS_MAIN, NS_HELP, NS_PROJECT ], // prefer these
1929                         MWNamespace::getValidNamespaces()
1930                 ) );
1931
1932                 $namespaces = array_diff( $namespaces, [
1933                         NS_FILE, NS_CATEGORY, NS_MEDIAWIKI, NS_USER // don't mess with magic namespaces
1934                 ] );
1935
1936                 $talk = array_filter( $namespaces, function ( $ns ) {
1937                         return MWNamespace::isTalk( $ns );
1938                 } );
1939
1940                 // prefer non-talk pages
1941                 $namespaces = array_diff( $namespaces, $talk );
1942                 $namespaces = array_merge( $namespaces, $talk );
1943
1944                 // check default content model of each namespace
1945                 foreach ( $namespaces as $ns ) {
1946                         if ( !isset( $wgNamespaceContentModels[$ns] ) ||
1947                                 $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT
1948                         ) {
1949                                 $wikitextNS = $ns;
1950
1951                                 return $wikitextNS;
1952                         }
1953                 }
1954
1955                 // give up
1956                 // @todo Inside a test, we could skip the test as incomplete.
1957                 //        But frequently, this is used in fixture setup.
1958                 throw new MWException( "No namespace defaults to wikitext!" );
1959         }
1960
1961         /**
1962          * Check, if $wgDiff3 is set and ready to merge
1963          * Will mark the calling test as skipped, if not ready
1964          *
1965          * @since 1.21
1966          */
1967         protected function markTestSkippedIfNoDiff3() {
1968                 global $wgDiff3;
1969
1970                 # This check may also protect against code injection in
1971                 # case of broken installations.
1972                 Wikimedia\suppressWarnings();
1973                 $haveDiff3 = $wgDiff3 && file_exists( $wgDiff3 );
1974                 Wikimedia\restoreWarnings();
1975
1976                 if ( !$haveDiff3 ) {
1977                         $this->markTestSkipped( "Skip test, since diff3 is not configured" );
1978                 }
1979         }
1980
1981         /**
1982          * Check if $extName is a loaded PHP extension, will skip the
1983          * test whenever it is not loaded.
1984          *
1985          * @since 1.21
1986          * @param string $extName
1987          * @return bool
1988          */
1989         protected function checkPHPExtension( $extName ) {
1990                 $loaded = extension_loaded( $extName );
1991                 if ( !$loaded ) {
1992                         $this->markTestSkipped( "PHP extension '$extName' is not loaded, skipping." );
1993                 }
1994
1995                 return $loaded;
1996         }
1997
1998         /**
1999          * Used as a marker to prevent wfResetOutputBuffers from breaking PHPUnit.
2000          * @param string $buffer
2001          * @return string
2002          */
2003         public static function wfResetOutputBuffersBarrier( $buffer ) {
2004                 return $buffer;
2005         }
2006
2007         /**
2008          * Create a temporary hook handler which will be reset by tearDown.
2009          * This replaces other handlers for the same hook.
2010          * @param string $hookName Hook name
2011          * @param mixed $handler Value suitable for a hook handler
2012          * @since 1.28
2013          */
2014         protected function setTemporaryHook( $hookName, $handler ) {
2015                 $this->mergeMwGlobalArrayValue( 'wgHooks', [ $hookName => [ $handler ] ] );
2016         }
2017
2018         /**
2019          * Check whether file contains given data.
2020          * @param string $fileName
2021          * @param string $actualData
2022          * @param bool $createIfMissing If true, and file does not exist, create it with given data
2023          *                              and skip the test.
2024          * @param string $msg
2025          * @since 1.30
2026          */
2027         protected function assertFileContains(
2028                 $fileName,
2029                 $actualData,
2030                 $createIfMissing = true,
2031                 $msg = ''
2032         ) {
2033                 if ( $createIfMissing ) {
2034                         if ( !file_exists( $fileName ) ) {
2035                                 file_put_contents( $fileName, $actualData );
2036                                 $this->markTestSkipped( 'Data file $fileName does not exist' );
2037                         }
2038                 } else {
2039                         self::assertFileExists( $fileName );
2040                 }
2041                 self::assertEquals( file_get_contents( $fileName ), $actualData, $msg );
2042         }
2043 }