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\IMaintainableDatabase;
   9 use Wikimedia\Rdbms\Database;
  10 use Wikimedia\TestingAccessWrapper;
  11
  12 /**
  13  * @since 1.18
  14  */
  15 abstract class MediaWikiTestCase extends PHPUnit_Framework_TestCase {
  16
  17         /**
  18          * The service locator created by prepareServices(). This service locator will
  19          * be restored after each test. Tests that pollute the global service locator
  20          * instance should use overrideMwServices() to isolate the test.
  21          *
  22          * @var MediaWikiServices|null
  23          */
  24         private static $serviceLocator = null;
  25
  26         /**
  27          * $called tracks whether the setUp and tearDown method has been called.
  28          * class extending MediaWikiTestCase usually override setUp and tearDown
  29          * but forget to call the parent.
  30          *
  31          * The array format takes a method name as key and anything as a value.
  32          * By asserting the key exist, we know the child class has called the
  33          * parent.
  34          *
  35          * This property must be private, we do not want child to override it,
  36          * they should call the appropriate parent method instead.
  37          */
  38         private $called = [];
  39
  40         /**
  41          * @var TestUser[]
  42          * @since 1.20
  43          */
  44         public static $users;
  45
  46         /**
  47          * Primary database
  48          *
  49          * @var Database
  50          * @since 1.18
  51          */
  52         protected $db;
  53
  54         /**
  55          * @var array
  56          * @since 1.19
  57          */
  58         protected $tablesUsed = []; // tables with data
  59
  60         private static $useTemporaryTables = true;
  61         private static $reuseDB = false;
  62         private static $dbSetup = false;
  63         private static $oldTablePrefix = '';
  64
  65         /**
  66          * Original value of PHP's error_reporting setting.
  67          *
  68          * @var int
  69          */
  70         private $phpErrorLevel;
  71
  72         /**
  73          * Holds the paths of temporary files/directories created through getNewTempFile,
  74          * and getNewTempDirectory
  75          *
  76          * @var array
  77          */
  78         private $tmpFiles = [];
  79
  80         /**
  81          * Holds original values of MediaWiki configuration settings
  82          * to be restored in tearDown().
  83          * See also setMwGlobals().
  84          * @var array
  85          */
  86         private $mwGlobals = [];
  87
  88         /**
  89          * Holds list of MediaWiki configuration settings to be unset in tearDown().
  90          * See also setMwGlobals().
  91          * @var array
  92          */
  93         private $mwGlobalsToUnset = [];
  94
  95         /**
  96          * Holds original loggers which have been replaced by setLogger()
  97          * @var LoggerInterface[]
  98          */
  99         private $loggers = [];
 100
 101         /**
 102          * Table name prefixes. Oracle likes it shorter.
 103          */
 104         const DB_PREFIX = 'unittest_';
 105         const ORA_DB_PREFIX = 'ut_';
 106
 107         /**
 108          * @var array
 109          * @since 1.18
 110          */
 111         protected $supportedDBs = [
 112                 'mysql',
 113                 'sqlite',
 114                 'postgres',
 115                 'oracle'
 116         ];
 117
 118         public function __construct( $name = null, array $data = [], $dataName = '' ) {
 119                 parent::__construct( $name, $data, $dataName );
 120
 121                 $this->backupGlobals = false;
 122                 $this->backupStaticAttributes = false;
 123         }
 124
 125         public function __destruct() {
 126                 // Complain if self::setUp() was called, but not self::tearDown()
 127                 // $this->called['setUp'] will be checked by self::testMediaWikiTestCaseParentSetupCalled()
 128                 if ( isset( $this->called['setUp'] ) && !isset( $this->called['tearDown'] ) ) {
 129                         throw new MWException( static::class . "::tearDown() must call parent::tearDown()" );
 130                 }
 131         }
 132
 133         public static function setUpBeforeClass() {
 134                 parent::setUpBeforeClass();
 135
 136                 // Get the service locator, and reset services if it's not done already
 137                 self::$serviceLocator = self::prepareServices( new GlobalVarConfig() );
 138         }
 139
 140         /**
 141          * Convenience method for getting an immutable test user
 142          *
 143          * @since 1.28
 144          *
 145          * @param string[] $groups Groups the test user should be in.
 146          * @return TestUser
 147          */
 148         public static function getTestUser( $groups = [] ) {
 149                 return TestUserRegistry::getImmutableTestUser( $groups );
 150         }
 151
 152         /**
 153          * Convenience method for getting a mutable test user
 154          *
 155          * @since 1.28
 156          *
 157          * @param string[] $groups Groups the test user should be added in.
 158          * @return TestUser
 159          */
 160         public static function getMutableTestUser( $groups = [] ) {
 161                 return TestUserRegistry::getMutableTestUser( __CLASS__, $groups );
 162         }
 163
 164         /**
 165          * Convenience method for getting an immutable admin test user
 166          *
 167          * @since 1.28
 168          *
 169          * @param string[] $groups Groups the test user should be added to.
 170          * @return TestUser
 171          */
 172         public static function getTestSysop() {
 173                 return self::getTestUser( [ 'sysop', 'bureaucrat' ] );
 174         }
 175
 176         /**
 177          * Prepare service configuration for unit testing.
 178          *
 179          * This calls MediaWikiServices::resetGlobalInstance() to allow some critical services
 180          * to be overridden for testing.
 181          *
 182          * prepareServices() only needs to be called once, but should be called as early as possible,
 183          * before any class has a chance to grab a reference to any of the global services
 184          * instances that get discarded by prepareServices(). Only the first call has any effect,
 185          * later calls are ignored.
 186          *
 187          * @note This is called by PHPUnitMaintClass::finalSetup.
 188          *
 189          * @see MediaWikiServices::resetGlobalInstance()
 190          *
 191          * @param Config $bootstrapConfig The bootstrap config to use with the new
 192          *        MediaWikiServices. Only used for the first call to this method.
 193          * @return MediaWikiServices
 194          */
 195         public static function prepareServices( Config $bootstrapConfig ) {
 196                 static $services = null;
 197
 198                 if ( !$services ) {
 199                         $services = self::resetGlobalServices( $bootstrapConfig );
 200                 }
 201                 return $services;
 202         }
 203
 204         /**
 205          * Reset global services, and install testing environment.
 206          * This is the testing equivalent of MediaWikiServices::resetGlobalInstance().
 207          * This should only be used to set up the testing environment, not when
 208          * running unit tests. Use MediaWikiTestCase::overrideMwServices() for that.
 209          *
 210          * @see MediaWikiServices::resetGlobalInstance()
 211          * @see prepareServices()
 212          * @see MediaWikiTestCase::overrideMwServices()
 213          *
 214          * @param Config|null $bootstrapConfig The bootstrap config to use with the new
 215          *        MediaWikiServices.
 216          * @return MediaWikiServices
 217          */
 218         protected static function resetGlobalServices( Config $bootstrapConfig = null ) {
 219                 $oldServices = MediaWikiServices::getInstance();
 220                 $oldConfigFactory = $oldServices->getConfigFactory();
 221                 $oldLoadBalancerFactory = $oldServices->getDBLoadBalancerFactory();
 222
 223                 $testConfig = self::makeTestConfig( $bootstrapConfig );
 224
 225                 MediaWikiServices::resetGlobalInstance( $testConfig );
 226
 227                 $serviceLocator = MediaWikiServices::getInstance();
 228                 self::installTestServices(
 229                         $oldConfigFactory,
 230                         $oldLoadBalancerFactory,
 231                         $serviceLocator
 232                 );
 233                 return $serviceLocator;
 234         }
 235
 236         /**
 237          * Create a config suitable for testing, based on a base config, default overrides,
 238          * and custom overrides.
 239          *
 240          * @param Config|null $baseConfig
 241          * @param Config|null $customOverrides
 242          *
 243          * @return Config
 244          */
 245         private static function makeTestConfig(
 246                 Config $baseConfig = null,
 247                 Config $customOverrides = null
 248         ) {
 249                 $defaultOverrides = new HashConfig();
 250
 251                 if ( !$baseConfig ) {
 252                         $baseConfig = MediaWikiServices::getInstance()->getBootstrapConfig();
 253                 }
 254
 255                 /* Some functions require some kind of caching, and will end up using the db,
 256                  * which we can't allow, as that would open a new connection for mysql.
 257                  * Replace with a HashBag. They would not be going to persist anyway.
 258                  */
 259                 $hashCache = [ 'class' => 'HashBagOStuff', 'reportDupes' => false ];
 260                 $objectCaches = [
 261                                 CACHE_DB => $hashCache,
 262                                 CACHE_ACCEL => $hashCache,
 263                                 CACHE_MEMCACHED => $hashCache,
 264                                 'apc' => $hashCache,
 265                                 'apcu' => $hashCache,
 266                                 'xcache' => $hashCache,
 267                                 'wincache' => $hashCache,
 268                         ] + $baseConfig->get( 'ObjectCaches' );
 269
 270                 $defaultOverrides->set( 'ObjectCaches', $objectCaches );
 271                 $defaultOverrides->set( 'MainCacheType', CACHE_NONE );
 272                 $defaultOverrides->set( 'JobTypeConf', [ 'default' => [ 'class' => 'JobQueueMemory' ] ] );
 273
 274                 // Use a fast hash algorithm to hash passwords.
 275                 $defaultOverrides->set( 'PasswordDefault', 'A' );
 276
 277                 $testConfig = $customOverrides
 278                         ? new MultiConfig( [ $customOverrides, $defaultOverrides, $baseConfig ] )
 279                         : new MultiConfig( [ $defaultOverrides, $baseConfig ] );
 280
 281                 return $testConfig;
 282         }
 283
 284         /**
 285          * @param ConfigFactory $oldConfigFactory
 286          * @param LBFactory $oldLoadBalancerFactory
 287          * @param MediaWikiServices $newServices
 288          *
 289          * @throws MWException
 290          */
 291         private static function installTestServices(
 292                 ConfigFactory $oldConfigFactory,
 293                 LBFactory $oldLoadBalancerFactory,
 294                 MediaWikiServices $newServices
 295         ) {
 296                 // Use bootstrap config for all configuration.
 297                 // This allows config overrides via global variables to take effect.
 298                 $bootstrapConfig = $newServices->getBootstrapConfig();
 299                 $newServices->resetServiceForTesting( 'ConfigFactory' );
 300                 $newServices->redefineService(
 301                         'ConfigFactory',
 302                         self::makeTestConfigFactoryInstantiator(
 303                                 $oldConfigFactory,
 304                                 [ 'main' => $bootstrapConfig ]
 305                         )
 306                 );
 307                 $newServices->resetServiceForTesting( 'DBLoadBalancerFactory' );
 308                 $newServices->redefineService(
 309                         'DBLoadBalancerFactory',
 310                         function ( MediaWikiServices $services ) use ( $oldLoadBalancerFactory ) {
 311                                 return $oldLoadBalancerFactory;
 312                         }
 313                 );
 314         }
 315
 316         /**
 317          * @param ConfigFactory $oldFactory
 318          * @param Config[] $configurations
 319          *
 320          * @return Closure
 321          */
 322         private static function makeTestConfigFactoryInstantiator(
 323                 ConfigFactory $oldFactory,
 324                 array $configurations
 325         ) {
 326                 return function ( MediaWikiServices $services ) use ( $oldFactory, $configurations ) {
 327                         $factory = new ConfigFactory();
 328
 329                         // clone configurations from $oldFactory that are not overwritten by $configurations
 330                         $namesToClone = array_diff(
 331                                 $oldFactory->getConfigNames(),
 332                                 array_keys( $configurations )
 333                         );
 334
 335                         foreach ( $namesToClone as $name ) {
 336                                 $factory->register( $name, $oldFactory->makeConfig( $name ) );
 337                         }
 338
 339                         foreach ( $configurations as $name => $config ) {
 340                                 $factory->register( $name, $config );
 341                         }
 342
 343                         return $factory;
 344                 };
 345         }
 346
 347         /**
 348          * Resets some well known services that typically have state that may interfere with unit tests.
 349          * This is a lightweight alternative to resetGlobalServices().
 350          *
 351          * @note There is no guarantee that no references remain to stale service instances destroyed
 352          * by a call to doLightweightServiceReset().
 353          *
 354          * @throws MWException if called outside of PHPUnit tests.
 355          *
 356          * @see resetGlobalServices()
 357          */
 358         private function doLightweightServiceReset() {
 359                 global $wgRequest;
 360
 361                 JobQueueGroup::destroySingletons();
 362                 ObjectCache::clear();
 363                 $services = MediaWikiServices::getInstance();
 364                 $services->resetServiceForTesting( 'MainObjectStash' );
 365                 $services->resetServiceForTesting( 'LocalServerObjectCache' );
 366                 $services->getMainWANObjectCache()->clearProcessCache();
 367                 FileBackendGroup::destroySingleton();
 368
 369                 // TODO: move global state into MediaWikiServices
 370                 RequestContext::resetMain();
 371                 if ( session_id() !== '' ) {
 372                         session_write_close();
 373                         session_id( '' );
 374                 }
 375
 376                 $wgRequest = new FauxRequest();
 377                 MediaWiki\Session\SessionManager::resetCache();
 378         }
 379
 380         public function run( PHPUnit_Framework_TestResult $result = null ) {
 381                 // Reset all caches between tests.
 382                 $this->doLightweightServiceReset();
 383
 384                 $needsResetDB = false;
 385
 386                 if ( !self::$dbSetup || $this->needsDB() ) {
 387                         // set up a DB connection for this test to use
 388
 389                         self::$useTemporaryTables = !$this->getCliArg( 'use-normal-tables' );
 390                         self::$reuseDB = $this->getCliArg( 'reuse-db' );
 391
 392                         $this->db = wfGetDB( DB_MASTER );
 393
 394                         $this->checkDbIsSupported();
 395
 396                         if ( !self::$dbSetup ) {
 397                                 $this->setupAllTestDBs();
 398                                 $this->addCoreDBData();
 399
 400                                 if ( ( $this->db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
 401                                         $this->resetDB( $this->db, $this->tablesUsed );
 402                                 }
 403                         }
 404
 405                         // TODO: the DB setup should be done in setUpBeforeClass(), so the test DB
 406                         // is available in subclass's setUpBeforeClass() and setUp() methods.
 407                         // This would also remove the need for the HACK that is oncePerClass().
 408                         if ( $this->oncePerClass() ) {
 409                                 $this->addDBDataOnce();
 410                         }
 411
 412                         $this->addDBData();
 413                         $needsResetDB = true;
 414                 }
 415
 416                 parent::run( $result );
 417
 418                 if ( $needsResetDB ) {
 419                         $this->resetDB( $this->db, $this->tablesUsed );
 420                 }
 421         }
 422
 423         /**
 424          * @return bool
 425          */
 426         private function oncePerClass() {
 427                 // Remember current test class in the database connection,
 428                 // so we know when we need to run addData.
 429
 430                 $class = static::class;
 431
 432                 $first = !isset( $this->db->_hasDataForTestClass )
 433                         || $this->db->_hasDataForTestClass !== $class;
 434
 435                 $this->db->_hasDataForTestClass = $class;
 436                 return $first;
 437         }
 438
 439         /**
 440          * @since 1.21
 441          *
 442          * @return bool
 443          */
 444         public function usesTemporaryTables() {
 445                 return self::$useTemporaryTables;
 446         }
 447
 448         /**
 449          * Obtains a new temporary file name
 450          *
 451          * The obtained filename is enlisted to be removed upon tearDown
 452          *
 453          * @since 1.20
 454          *
 455          * @return string Absolute name of the temporary file
 456          */
 457         protected function getNewTempFile() {
 458                 $fileName = tempnam( wfTempDir(), 'MW_PHPUnit_' . static::class . '_' );
 459                 $this->tmpFiles[] = $fileName;
 460
 461                 return $fileName;
 462         }
 463
 464         /**
 465          * obtains a new temporary directory
 466          *
 467          * The obtained directory is enlisted to be removed (recursively with all its contained
 468          * files) upon tearDown.
 469          *
 470          * @since 1.20
 471          *
 472          * @return string Absolute name of the temporary directory
 473          */
 474         protected function getNewTempDirectory() {
 475                 // Starting of with a temporary /file/.
 476                 $fileName = $this->getNewTempFile();
 477
 478                 // Converting the temporary /file/ to a /directory/
 479                 // The following is not atomic, but at least we now have a single place,
 480                 // where temporary directory creation is bundled and can be improved
 481                 unlink( $fileName );
 482                 $this->assertTrue( wfMkdirParents( $fileName ) );
 483
 484                 return $fileName;
 485         }
 486
 487         protected function setUp() {
 488                 parent::setUp();
 489                 $this->called['setUp'] = true;
 490
 491                 $this->phpErrorLevel = intval( ini_get( 'error_reporting' ) );
 492
 493                 // Cleaning up temporary files
 494                 foreach ( $this->tmpFiles as $fileName ) {
 495                         if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
 496                                 unlink( $fileName );
 497                         } elseif ( is_dir( $fileName ) ) {
 498                                 wfRecursiveRemoveDir( $fileName );
 499                         }
 500                 }
 501
 502                 if ( $this->needsDB() && $this->db ) {
 503                         // Clean up open transactions
 504                         while ( $this->db->trxLevel() > 0 ) {
 505                                 $this->db->rollback( __METHOD__, 'flush' );
 506                         }
 507                         // Check for unsafe queries
 508                         if ( $this->db->getType() === 'mysql' ) {
 509                                 $this->db->query( "SET sql_mode = 'STRICT_ALL_TABLES'" );
 510                         }
 511                 }
 512
 513                 DeferredUpdates::clearPendingUpdates();
 514                 ObjectCache::getMainWANInstance()->clearProcessCache();
 515
 516                 // XXX: reset maintenance triggers
 517                 // Hook into period lag checks which often happen in long-running scripts
 518                 $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
 519                 Maintenance::setLBFactoryTriggers( $lbFactory );
 520
 521                 ob_start( 'MediaWikiTestCase::wfResetOutputBuffersBarrier' );
 522         }
 523
 524         protected function addTmpFiles( $files ) {
 525                 $this->tmpFiles = array_merge( $this->tmpFiles, (array)$files );
 526         }
 527
 528         protected function tearDown() {
 529                 global $wgRequest, $wgSQLMode;
 530
 531                 $status = ob_get_status();
 532                 if ( isset( $status['name'] ) &&
 533                         $status['name'] === 'MediaWikiTestCase::wfResetOutputBuffersBarrier'
 534                 ) {
 535                         ob_end_flush();
 536                 }
 537
 538                 $this->called['tearDown'] = true;
 539                 // Cleaning up temporary files
 540                 foreach ( $this->tmpFiles as $fileName ) {
 541                         if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
 542                                 unlink( $fileName );
 543                         } elseif ( is_dir( $fileName ) ) {
 544                                 wfRecursiveRemoveDir( $fileName );
 545                         }
 546                 }
 547
 548                 if ( $this->needsDB() && $this->db ) {
 549                         // Clean up open transactions
 550                         while ( $this->db->trxLevel() > 0 ) {
 551                                 $this->db->rollback( __METHOD__, 'flush' );
 552                         }
 553                         if ( $this->db->getType() === 'mysql' ) {
 554                                 $this->db->query( "SET sql_mode = " . $this->db->addQuotes( $wgSQLMode ) );
 555                         }
 556                 }
 557
 558                 // Restore mw globals
 559                 foreach ( $this->mwGlobals as $key => $value ) {
 560                         $GLOBALS[$key] = $value;
 561                 }
 562                 foreach ( $this->mwGlobalsToUnset as $value ) {
 563                         unset( $GLOBALS[$value] );
 564                 }
 565                 $this->mwGlobals = [];
 566                 $this->mwGlobalsToUnset = [];
 567                 $this->restoreLoggers();
 568
 569                 if ( self::$serviceLocator && MediaWikiServices::getInstance() !== self::$serviceLocator ) {
 570                         MediaWikiServices::forceGlobalInstance( self::$serviceLocator );
 571                 }
 572
 573                 // TODO: move global state into MediaWikiServices
 574                 RequestContext::resetMain();
 575                 if ( session_id() !== '' ) {
 576                         session_write_close();
 577                         session_id( '' );
 578                 }
 579                 $wgRequest = new FauxRequest();
 580                 MediaWiki\Session\SessionManager::resetCache();
 581                 MediaWiki\Auth\AuthManager::resetCache();
 582
 583                 $phpErrorLevel = intval( ini_get( 'error_reporting' ) );
 584
 585                 if ( $phpErrorLevel !== $this->phpErrorLevel ) {
 586                         ini_set( 'error_reporting', $this->phpErrorLevel );
 587
 588                         $oldHex = strtoupper( dechex( $this->phpErrorLevel ) );
 589                         $newHex = strtoupper( dechex( $phpErrorLevel ) );
 590                         $message = "PHP error_reporting setting was left dirty: "
 591                                 . "was 0x$oldHex before test, 0x$newHex after test!";
 592
 593                         $this->fail( $message );
 594                 }
 595
 596                 parent::tearDown();
 597         }
 598
 599         /**
 600          * Make sure MediaWikiTestCase extending classes have called their
 601          * parent setUp method
 602          *
 603          * With strict coverage activated in PHP_CodeCoverage, this test would be
 604          * marked as risky without the following annotation (T152923).
 605          * @coversNothing
 606          */
 607         final public function testMediaWikiTestCaseParentSetupCalled() {
 608                 $this->assertArrayHasKey( 'setUp', $this->called,
 609                         static::class . '::setUp() must call parent::setUp()'
 610                 );
 611         }
 612
 613         /**
 614          * Sets a service, maintaining a stashed version of the previous service to be
 615          * restored in tearDown
 616          *
 617          * @since 1.27
 618          *
 619          * @param string $name
 620          * @param object $object
 621          */
 622         protected function setService( $name, $object ) {
 623                 // If we did not yet override the service locator, so so now.
 624                 if ( MediaWikiServices::getInstance() === self::$serviceLocator ) {
 625                         $this->overrideMwServices();
 626                 }
 627
 628                 MediaWikiServices::getInstance()->disableService( $name );
 629                 MediaWikiServices::getInstance()->redefineService(
 630                         $name,
 631                         function () use ( $object ) {
 632                                 return $object;
 633                         }
 634                 );
 635         }
 636
 637         /**
 638          * Sets a global, maintaining a stashed version of the previous global to be
 639          * restored in tearDown
 640          *
 641          * The key is added to the array of globals that will be reset afterwards
 642          * in the tearDown().
 643          *
 644          * @par Example
 645          * @code
 646          *     protected function setUp() {
 647          *         $this->setMwGlobals( 'wgRestrictStuff', true );
 648          *     }
 649          *
 650          *     function testFoo() {}
 651          *
 652          *     function testBar() {}
 653          *         $this->assertTrue( self::getX()->doStuff() );
 654          *
 655          *         $this->setMwGlobals( 'wgRestrictStuff', false );
 656          *         $this->assertTrue( self::getX()->doStuff() );
 657          *     }
 658          *
 659          *     function testQuux() {}
 660          * @endcode
 661          *
 662          * @param array|string $pairs Key to the global variable, or an array
 663          *  of key/value pairs.
 664          * @param mixed $value Value to set the global to (ignored
 665          *  if an array is given as first argument).
 666          *
 667          * @note To allow changes to global variables to take effect on global service instances,
 668          *       call overrideMwServices().
 669          *
 670          * @since 1.21
 671          */
 672         protected function setMwGlobals( $pairs, $value = null ) {
 673                 if ( is_string( $pairs ) ) {
 674                         $pairs = [ $pairs => $value ];
 675                 }
 676
 677                 $this->stashMwGlobals( array_keys( $pairs ) );
 678
 679                 foreach ( $pairs as $key => $value ) {
 680                         $GLOBALS[$key] = $value;
 681                 }
 682         }
 683
 684         /**
 685          * Check if we can back up a value by performing a shallow copy.
 686          * Values which fail this test are copied recursively.
 687          *
 688          * @param mixed $value
 689          * @return bool True if a shallow copy will do; false if a deep copy
 690          *  is required.
 691          */
 692         private static function canShallowCopy( $value ) {
 693                 if ( is_scalar( $value ) || $value === null ) {
 694                         return true;
 695                 }
 696                 if ( is_array( $value ) ) {
 697                         foreach ( $value as $subValue ) {
 698                                 if ( !is_scalar( $subValue ) && $subValue !== null ) {
 699                                         return false;
 700                                 }
 701                         }
 702                         return true;
 703                 }
 704                 return false;
 705         }
 706
 707         /**
 708          * Stashes the global, will be restored in tearDown()
 709          *
 710          * Individual test functions may override globals through the setMwGlobals() function
 711          * or directly. When directly overriding globals their keys should first be passed to this
 712          * method in setUp to avoid breaking global state for other tests
 713          *
 714          * That way all other tests are executed with the same settings (instead of using the
 715          * unreliable local settings for most tests and fix it only for some tests).
 716          *
 717          * @param array|string $globalKeys Key to the global variable, or an array of keys.
 718          *
 719          * @note To allow changes to global variables to take effect on global service instances,
 720          *       call overrideMwServices().
 721          *
 722          * @since 1.23
 723          */
 724         protected function stashMwGlobals( $globalKeys ) {
 725                 if ( is_string( $globalKeys ) ) {
 726                         $globalKeys = [ $globalKeys ];
 727                 }
 728
 729                 foreach ( $globalKeys as $globalKey ) {
 730                         // NOTE: make sure we only save the global once or a second call to
 731                         // setMwGlobals() on the same global would override the original
 732                         // value.
 733                         if (
 734                                 !array_key_exists( $globalKey, $this->mwGlobals ) &&
 735                                 !array_key_exists( $globalKey, $this->mwGlobalsToUnset )
 736                         ) {
 737                                 if ( !array_key_exists( $globalKey, $GLOBALS ) ) {
 738                                         $this->mwGlobalsToUnset[$globalKey] = $globalKey;
 739                                         continue;
 740                                 }
 741                                 // NOTE: we serialize then unserialize the value in case it is an object
 742                                 // this stops any objects being passed by reference. We could use clone
 743                                 // and if is_object but this does account for objects within objects!
 744                                 if ( self::canShallowCopy( $GLOBALS[$globalKey] ) ) {
 745                                         $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 746                                 } elseif (
 747                                         // Many MediaWiki types are safe to clone. These are the
 748                                         // ones that are most commonly stashed.
 749                                         $GLOBALS[$globalKey] instanceof Language ||
 750                                         $GLOBALS[$globalKey] instanceof User ||
 751                                         $GLOBALS[$globalKey] instanceof FauxRequest
 752                                 ) {
 753                                         $this->mwGlobals[$globalKey] = clone $GLOBALS[$globalKey];
 754                                 } elseif ( $this->containsClosure( $GLOBALS[$globalKey] ) ) {
 755                                         // Serializing Closure only gives a warning on HHVM while
 756                                         // it throws an Exception on Zend.
 757                                         // Workaround for https://github.com/facebook/hhvm/issues/6206
 758                                         $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 759                                 } else {
 760                                         try {
 761                                                 $this->mwGlobals[$globalKey] = unserialize( serialize( $GLOBALS[$globalKey] ) );
 762                                         } catch ( Exception $e ) {
 763                                                 $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 764                                         }
 765                                 }
 766                         }
 767                 }
 768         }
 769
 770         /**
 771          * @param mixed $var
 772          * @param int $maxDepth
 773          *
 774          * @return bool
 775          */
 776         private function containsClosure( $var, $maxDepth = 15 ) {
 777                 if ( $var instanceof Closure ) {
 778                         return true;
 779                 }
 780                 if ( !is_array( $var ) || $maxDepth === 0 ) {
 781                         return false;
 782                 }
 783
 784                 foreach ( $var as $value ) {
 785                         if ( $this->containsClosure( $value, $maxDepth - 1 ) ) {
 786                                 return true;
 787                         }
 788                 }
 789                 return false;
 790         }
 791
 792         /**
 793          * Merges the given values into a MW global array variable.
 794          * Useful for setting some entries in a configuration array, instead of
 795          * setting the entire array.
 796          *
 797          * @param string $name The name of the global, as in wgFooBar
 798          * @param array $values The array containing the entries to set in that global
 799          *
 800          * @throws MWException If the designated global is not an array.
 801          *
 802          * @note To allow changes to global variables to take effect on global service instances,
 803          *       call overrideMwServices().
 804          *
 805          * @since 1.21
 806          */
 807         protected function mergeMwGlobalArrayValue( $name, $values ) {
 808                 if ( !isset( $GLOBALS[$name] ) ) {
 809                         $merged = $values;
 810                 } else {
 811                         if ( !is_array( $GLOBALS[$name] ) ) {
 812                                 throw new MWException( "MW global $name is not an array." );
 813                         }
 814
 815                         // NOTE: do not use array_merge, it screws up for numeric keys.
 816                         $merged = $GLOBALS[$name];
 817                         foreach ( $values as $k => $v ) {
 818                                 $merged[$k] = $v;
 819                         }
 820                 }
 821
 822                 $this->setMwGlobals( $name, $merged );
 823         }
 824
 825         /**
 826          * Stashes the global instance of MediaWikiServices, and installs a new one,
 827          * allowing test cases to override settings and services.
 828          * The previous instance of MediaWikiServices will be restored on tearDown.
 829          *
 830          * @since 1.27
 831          *
 832          * @param Config $configOverrides Configuration overrides for the new MediaWikiServices instance.
 833          * @param callable[] $services An associative array of services to re-define. Keys are service
 834          *        names, values are callables.
 835          *
 836          * @return MediaWikiServices
 837          * @throws MWException
 838          */
 839         protected function overrideMwServices( Config $configOverrides = null, array $services = [] ) {
 840                 if ( !$configOverrides ) {
 841                         $configOverrides = new HashConfig();
 842                 }
 843
 844                 $oldInstance = MediaWikiServices::getInstance();
 845                 $oldConfigFactory = $oldInstance->getConfigFactory();
 846                 $oldLoadBalancerFactory = $oldInstance->getDBLoadBalancerFactory();
 847
 848                 $testConfig = self::makeTestConfig( null, $configOverrides );
 849                 $newInstance = new MediaWikiServices( $testConfig );
 850
 851                 // Load the default wiring from the specified files.
 852                 // NOTE: this logic mirrors the logic in MediaWikiServices::newInstance.
 853                 $wiringFiles = $testConfig->get( 'ServiceWiringFiles' );
 854                 $newInstance->loadWiringFiles( $wiringFiles );
 855
 856                 // Provide a traditional hook point to allow extensions to configure services.
 857                 Hooks::run( 'MediaWikiServices', [ $newInstance ] );
 858
 859                 foreach ( $services as $name => $callback ) {
 860                         $newInstance->redefineService( $name, $callback );
 861                 }
 862
 863                 self::installTestServices(
 864                         $oldConfigFactory,
 865                         $oldLoadBalancerFactory,
 866                         $newInstance
 867                 );
 868                 MediaWikiServices::forceGlobalInstance( $newInstance );
 869
 870                 return $newInstance;
 871         }
 872
 873         /**
 874          * @since 1.27
 875          * @param string|Language $lang
 876          */
 877         public function setUserLang( $lang ) {
 878                 RequestContext::getMain()->setLanguage( $lang );
 879                 $this->setMwGlobals( 'wgLang', RequestContext::getMain()->getLanguage() );
 880         }
 881
 882         /**
 883          * @since 1.27
 884          * @param string|Language $lang
 885          */
 886         public function setContentLang( $lang ) {
 887                 if ( $lang instanceof Language ) {
 888                         $langCode = $lang->getCode();
 889                         $langObj = $lang;
 890                 } else {
 891                         $langCode = $lang;
 892                         $langObj = Language::factory( $langCode );
 893                 }
 894                 $this->setMwGlobals( [
 895                         'wgLanguageCode' => $langCode,
 896                         'wgContLang' => $langObj,
 897                 ] );
 898         }
 899
 900         /**
 901          * Sets the logger for a specified channel, for the duration of the test.
 902          * @since 1.27
 903          * @param string $channel
 904          * @param LoggerInterface $logger
 905          */
 906         protected function setLogger( $channel, LoggerInterface $logger ) {
 907                 // TODO: Once loggers are managed by MediaWikiServices, use
 908                 //       overrideMwServices() to set loggers.
 909
 910                 $provider = LoggerFactory::getProvider();
 911                 $wrappedProvider = TestingAccessWrapper::newFromObject( $provider );
 912                 $singletons = $wrappedProvider->singletons;
 913                 if ( $provider instanceof MonologSpi ) {
 914                         if ( !isset( $this->loggers[$channel] ) ) {
 915                                 $this->loggers[$channel] = isset( $singletons['loggers'][$channel] )
 916                                         ? $singletons['loggers'][$channel] : null;
 917                         }
 918                         $singletons['loggers'][$channel] = $logger;
 919                 } elseif ( $provider instanceof LegacySpi ) {
 920                         if ( !isset( $this->loggers[$channel] ) ) {
 921                                 $this->loggers[$channel] = isset( $singletons[$channel] ) ? $singletons[$channel] : null;
 922                         }
 923                         $singletons[$channel] = $logger;
 924                 } else {
 925                         throw new LogicException( __METHOD__ . ': setting a logger for ' . get_class( $provider )
 926                                 . ' is not implemented' );
 927                 }
 928                 $wrappedProvider->singletons = $singletons;
 929         }
 930
 931         /**
 932          * Restores loggers replaced by setLogger().
 933          * @since 1.27
 934          */
 935         private function restoreLoggers() {
 936                 $provider = LoggerFactory::getProvider();
 937                 $wrappedProvider = TestingAccessWrapper::newFromObject( $provider );
 938                 $singletons = $wrappedProvider->singletons;
 939                 foreach ( $this->loggers as $channel => $logger ) {
 940                         if ( $provider instanceof MonologSpi ) {
 941                                 if ( $logger === null ) {
 942                                         unset( $singletons['loggers'][$channel] );
 943                                 } else {
 944                                         $singletons['loggers'][$channel] = $logger;
 945                                 }
 946                         } elseif ( $provider instanceof LegacySpi ) {
 947                                 if ( $logger === null ) {
 948                                         unset( $singletons[$channel] );
 949                                 } else {
 950                                         $singletons[$channel] = $logger;
 951                                 }
 952                         }
 953                 }
 954                 $wrappedProvider->singletons = $singletons;
 955                 $this->loggers = [];
 956         }
 957
 958         /**
 959          * @return string
 960          * @since 1.18
 961          */
 962         public function dbPrefix() {
 963                 return $this->db->getType() == 'oracle' ? self::ORA_DB_PREFIX : self::DB_PREFIX;
 964         }
 965
 966         /**
 967          * @return bool
 968          * @since 1.18
 969          */
 970         public function needsDB() {
 971                 // If the test says it uses database tables, it needs the database
 972                 if ( $this->tablesUsed ) {
 973                         return true;
 974                 }
 975
 976                 // If the test class says it belongs to the Database group, it needs the database.
 977                 // NOTE: This ONLY checks for the group in the class level doc comment.
 978                 $rc = new ReflectionClass( $this );
 979                 if ( preg_match( '/@group +Database/im', $rc->getDocComment() ) ) {
 980                         return true;
 981                 }
 982
 983                 return false;
 984         }
 985
 986         /**
 987          * Insert a new page.
 988          *
 989          * Should be called from addDBData().
 990          *
 991          * @since 1.25 ($namespace in 1.28)
 992          * @param string|title $pageName Page name or title
 993          * @param string $text Page's content
 994          * @param int $namespace Namespace id (name cannot already contain namespace)
 995          * @return array Title object and page id
 996          */
 997         protected function insertPage(
 998                 $pageName,
 999                 $text = 'Sample page for unit test.',
1000                 $namespace = null
1001         ) {
1002                 if ( is_string( $pageName ) ) {
1003                         $title = Title::newFromText( $pageName, $namespace );
1004                 } else {
1005                         $title = $pageName;
1006                 }
1007
1008                 $user = static::getTestSysop()->getUser();
1009                 $comment = __METHOD__ . ': Sample page for unit test.';
1010
1011                 // Avoid memory leak...?
1012                 // LinkCache::singleton()->clear();
1013                 // Maybe.  But doing this absolutely breaks $title->isRedirect() when called during unit tests....
1014
1015                 $page = WikiPage::factory( $title );
1016                 $page->doEditContent( ContentHandler::makeContent( $text, $title ), $comment, 0, false, $user );
1017
1018                 return [
1019                         'title' => $title,
1020                         'id' => $page->getId(),
1021                 ];
1022         }
1023
1024         /**
1025          * Stub. If a test suite needs to add additional data to the database, it should
1026          * implement this method and do so. This method is called once per test suite
1027          * (i.e. once per class).
1028          *
1029          * Note data added by this method may be removed by resetDB() depending on
1030          * the contents of $tablesUsed.
1031          *
1032          * To add additional data between test function runs, override prepareDB().
1033          *
1034          * @see addDBData()
1035          * @see resetDB()
1036          *
1037          * @since 1.27
1038          */
1039         public function addDBDataOnce() {
1040         }
1041
1042         /**
1043          * Stub. Subclasses may override this to prepare the database.
1044          * Called before every test run (test function or data set).
1045          *
1046          * @see addDBDataOnce()
1047          * @see resetDB()
1048          *
1049          * @since 1.18
1050          */
1051         public function addDBData() {
1052         }
1053
1054         private function addCoreDBData() {
1055                 if ( $this->db->getType() == 'oracle' ) {
1056                         # Insert 0 user to prevent FK violations
1057                         # Anonymous user
1058                         if ( !$this->db->selectField( 'user', '1', [ 'user_id' => 0 ] ) ) {
1059                                 $this->db->insert( 'user', [
1060                                         'user_id' => 0,
1061                                         'user_name' => 'Anonymous' ], __METHOD__, [ 'IGNORE' ] );
1062                         }
1063
1064                         # Insert 0 page to prevent FK violations
1065                         # Blank page
1066                         if ( !$this->db->selectField( 'page', '1', [ 'page_id' => 0 ] ) ) {
1067                                 $this->db->insert( 'page', [
1068                                         'page_id' => 0,
1069                                         'page_namespace' => 0,
1070                                         'page_title' => ' ',
1071                                         'page_restrictions' => null,
1072                                         'page_is_redirect' => 0,
1073                                         'page_is_new' => 0,
1074                                         'page_random' => 0,
1075                                         'page_touched' => $this->db->timestamp(),
1076                                         'page_latest' => 0,
1077                                         'page_len' => 0 ], __METHOD__, [ 'IGNORE' ] );
1078                         }
1079                 }
1080
1081                 User::resetIdByNameCache();
1082
1083                 // Make sysop user
1084                 $user = static::getTestSysop()->getUser();
1085
1086                 // Make 1 page with 1 revision
1087                 $page = WikiPage::factory( Title::newFromText( 'UTPage' ) );
1088                 if ( $page->getId() == 0 ) {
1089                         $page->doEditContent(
1090                                 new WikitextContent( 'UTContent' ),
1091                                 'UTPageSummary',
1092                                 EDIT_NEW | EDIT_SUPPRESS_RC,
1093                                 false,
1094                                 $user
1095                         );
1096                         // an edit always attempt to purge backlink links such as history
1097                         // pages. That is unneccessary.
1098                         JobQueueGroup::singleton()->get( 'htmlCacheUpdate' )->delete();
1099                         // WikiPages::doEditUpdates randomly adds RC purges
1100                         JobQueueGroup::singleton()->get( 'recentChangesUpdate' )->delete();
1101
1102                         // doEditContent() probably started the session via
1103                         // User::loadFromSession(). Close it now.
1104                         if ( session_id() !== '' ) {
1105                                 session_write_close();
1106                                 session_id( '' );
1107                         }
1108                 }
1109         }
1110
1111         /**
1112          * Restores MediaWiki to using the table set (table prefix) it was using before
1113          * setupTestDB() was called. Useful if we need to perform database operations
1114          * after the test run has finished (such as saving logs or profiling info).
1115          *
1116          * @since 1.21
1117          */
1118         public static function teardownTestDB() {
1119                 global $wgJobClasses;
1120
1121                 if ( !self::$dbSetup ) {
1122                         return;
1123                 }
1124
1125                 Hooks::run( 'UnitTestsBeforeDatabaseTeardown' );
1126
1127                 foreach ( $wgJobClasses as $type => $class ) {
1128                         // Delete any jobs under the clone DB (or old prefix in other stores)
1129                         JobQueueGroup::singleton()->get( $type )->delete();
1130                 }
1131
1132                 CloneDatabase::changePrefix( self::$oldTablePrefix );
1133
1134                 self::$oldTablePrefix = false;
1135                 self::$dbSetup = false;
1136         }
1137
1138         /**
1139          * Setups a database with the given prefix.
1140          *
1141          * If reuseDB is true and certain conditions apply, it will just change the prefix.
1142          * Otherwise, it will clone the tables and change the prefix.
1143          *
1144          * Clones all tables in the given database (whatever database that connection has
1145          * open), to versions with the test prefix.
1146          *
1147          * @param IMaintainableDatabase $db Database to use
1148          * @param string $prefix Prefix to use for test tables
1149          * @return bool True if tables were cloned, false if only the prefix was changed
1150          */
1151         protected static function setupDatabaseWithTestPrefix( IMaintainableDatabase $db, $prefix ) {
1152                 $tablesCloned = self::listTables( $db );
1153                 $dbClone = new CloneDatabase( $db, $tablesCloned, $prefix );
1154                 $dbClone->useTemporaryTables( self::$useTemporaryTables );
1155
1156                 if ( ( $db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
1157                         CloneDatabase::changePrefix( $prefix );
1158
1159                         return false;
1160                 } else {
1161                         $dbClone->cloneTableStructure();
1162                         return true;
1163                 }
1164         }
1165
1166         /**
1167          * Set up all test DBs
1168          */
1169         public function setupAllTestDBs() {
1170                 global $wgDBprefix;
1171
1172                 self::$oldTablePrefix = $wgDBprefix;
1173
1174                 $testPrefix = $this->dbPrefix();
1175
1176                 // switch to a temporary clone of the database
1177                 self::setupTestDB( $this->db, $testPrefix );
1178
1179                 if ( self::isUsingExternalStoreDB() ) {
1180                         self::setupExternalStoreTestDBs( $testPrefix );
1181                 }
1182         }
1183
1184         /**
1185          * Creates an empty skeleton of the wiki database by cloning its structure
1186          * to equivalent tables using the given $prefix. Then sets MediaWiki to
1187          * use the new set of tables (aka schema) instead of the original set.
1188          *
1189          * This is used to generate a dummy table set, typically consisting of temporary
1190          * tables, that will be used by tests instead of the original wiki database tables.
1191          *
1192          * @since 1.21
1193          *
1194          * @note the original table prefix is stored in self::$oldTablePrefix. This is used
1195          * by teardownTestDB() to return the wiki to using the original table set.
1196          *
1197          * @note this method only works when first called. Subsequent calls have no effect,
1198          * even if using different parameters.
1199          *
1200          * @param Database $db The database connection
1201          * @param string $prefix The prefix to use for the new table set (aka schema).
1202          *
1203          * @throws MWException If the database table prefix is already $prefix
1204          */
1205         public static function setupTestDB( Database $db, $prefix ) {
1206                 if ( self::$dbSetup ) {
1207                         return;
1208                 }
1209
1210                 if ( $db->tablePrefix() === $prefix ) {
1211                         throw new MWException(
1212                                 'Cannot run unit tests, the database prefix is already "' . $prefix . '"' );
1213                 }
1214
1215                 // TODO: the below should be re-written as soon as LBFactory, LoadBalancer,
1216                 // and Database no longer use global state.
1217
1218                 self::$dbSetup = true;
1219
1220                 if ( !self::setupDatabaseWithTestPrefix( $db, $prefix ) ) {
1221                         return;
1222                 }
1223
1224                 // Assuming this isn't needed for External Store database, and not sure if the procedure
1225                 // would be available there.
1226                 if ( $db->getType() == 'oracle' ) {
1227                         $db->query( 'BEGIN FILL_WIKI_INFO; END;' );
1228                 }
1229
1230                 Hooks::run( 'UnitTestsAfterDatabaseSetup', [ $db, $prefix ] );
1231         }
1232
1233         /**
1234          * Clones the External Store database(s) for testing
1235          *
1236          * @param string $testPrefix Prefix for test tables
1237          */
1238         protected static function setupExternalStoreTestDBs( $testPrefix ) {
1239                 $connections = self::getExternalStoreDatabaseConnections();
1240                 foreach ( $connections as $dbw ) {
1241                         // Hack: cloneTableStructure sets $wgDBprefix to the unit test
1242                         // prefix,.  Even though listTables now uses tablePrefix, that
1243                         // itself is populated from $wgDBprefix by default.
1244
1245                         // We have to set it back, or we won't find the original 'blobs'
1246                         // table to copy.
1247
1248                         $dbw->tablePrefix( self::$oldTablePrefix );
1249                         self::setupDatabaseWithTestPrefix( $dbw, $testPrefix );
1250                 }
1251         }
1252
1253         /**
1254          * Gets master database connections for all of the ExternalStoreDB
1255          * stores configured in $wgDefaultExternalStore.
1256          *
1257          * @return Database[] Array of Database master connections
1258          */
1259         protected static function getExternalStoreDatabaseConnections() {
1260                 global $wgDefaultExternalStore;
1261
1262                 /** @var ExternalStoreDB $externalStoreDB */
1263                 $externalStoreDB = ExternalStore::getStoreObject( 'DB' );
1264                 $defaultArray = (array)$wgDefaultExternalStore;
1265                 $dbws = [];
1266                 foreach ( $defaultArray as $url ) {
1267                         if ( strpos( $url, 'DB://' ) === 0 ) {
1268                                 list( $proto, $cluster ) = explode( '://', $url, 2 );
1269                                 // Avoid getMaster() because setupDatabaseWithTestPrefix()
1270                                 // requires Database instead of plain DBConnRef/IDatabase
1271                                 $dbws[] = $externalStoreDB->getMaster( $cluster );
1272                         }
1273                 }
1274
1275                 return $dbws;
1276         }
1277
1278         /**
1279          * Check whether ExternalStoreDB is being used
1280          *
1281          * @return bool True if it's being used
1282          */
1283         protected static function isUsingExternalStoreDB() {
1284                 global $wgDefaultExternalStore;
1285                 if ( !$wgDefaultExternalStore ) {
1286                         return false;
1287                 }
1288
1289                 $defaultArray = (array)$wgDefaultExternalStore;
1290                 foreach ( $defaultArray as $url ) {
1291                         if ( strpos( $url, 'DB://' ) === 0 ) {
1292                                 return true;
1293                         }
1294                 }
1295
1296                 return false;
1297         }
1298
1299         /**
1300          * Empty all tables so they can be repopulated for tests
1301          *
1302          * @param Database $db|null Database to reset
1303          * @param array $tablesUsed Tables to reset
1304          */
1305         private function resetDB( $db, $tablesUsed ) {
1306                 if ( $db ) {
1307                         $userTables = [ 'user', 'user_groups', 'user_properties' ];
1308                         $pageTables = [ 'page', 'revision', 'ip_changes', 'revision_comment_temp', 'comment' ];
1309                         $coreDBDataTables = array_merge( $userTables, $pageTables );
1310
1311                         // If any of the user or page tables were marked as used, we should clear all of them.
1312                         if ( array_intersect( $tablesUsed, $userTables ) ) {
1313                                 $tablesUsed = array_unique( array_merge( $tablesUsed, $userTables ) );
1314                                 TestUserRegistry::clear();
1315                         }
1316                         if ( array_intersect( $tablesUsed, $pageTables ) ) {
1317                                 $tablesUsed = array_unique( array_merge( $tablesUsed, $pageTables ) );
1318                         }
1319
1320                         $truncate = in_array( $db->getType(), [ 'oracle', 'mysql' ] );
1321                         foreach ( $tablesUsed as $tbl ) {
1322                                 // TODO: reset interwiki table to its original content.
1323                                 if ( $tbl == 'interwiki' ) {
1324                                         continue;
1325                                 }
1326
1327                                 if ( $truncate ) {
1328                                         $db->query( 'TRUNCATE TABLE ' . $db->tableName( $tbl ), __METHOD__ );
1329                                 } else {
1330                                         $db->delete( $tbl, '*', __METHOD__ );
1331                                 }
1332
1333                                 if ( $tbl === 'page' ) {
1334                                         // Forget about the pages since they don't
1335                                         // exist in the DB.
1336                                         LinkCache::singleton()->clear();
1337                                 }
1338                         }
1339
1340                         if ( array_intersect( $tablesUsed, $coreDBDataTables ) ) {
1341                                 // Re-add core DB data that was deleted
1342                                 $this->addCoreDBData();
1343                         }
1344                 }
1345         }
1346
1347         /**
1348          * @since 1.18
1349          *
1350          * @param string $func
1351          * @param array $args
1352          *
1353          * @return mixed
1354          * @throws MWException
1355          */
1356         public function __call( $func, $args ) {
1357                 static $compatibility = [
1358                         'createMock' => 'createMock2',
1359                 ];
1360
1361                 if ( isset( $compatibility[$func] ) ) {
1362                         return call_user_func_array( [ $this, $compatibility[$func] ], $args );
1363                 } else {
1364                         throw new MWException( "Called non-existent $func method on " . static::class );
1365                 }
1366         }
1367
1368         /**
1369          * Return a test double for the specified class.
1370          *
1371          * @param string $originalClassName
1372          * @return PHPUnit_Framework_MockObject_MockObject
1373          * @throws Exception
1374          */
1375         private function createMock2( $originalClassName ) {
1376                 return $this->getMockBuilder( $originalClassName )
1377                         ->disableOriginalConstructor()
1378                         ->disableOriginalClone()
1379                         ->disableArgumentCloning()
1380                         // New in phpunit-mock-objects 3.2 (phpunit 5.4.0)
1381                         // ->disallowMockingUnknownTypes()
1382                         ->getMock();
1383         }
1384
1385         private static function unprefixTable( &$tableName, $ind, $prefix ) {
1386                 $tableName = substr( $tableName, strlen( $prefix ) );
1387         }
1388
1389         private static function isNotUnittest( $table ) {
1390                 return strpos( $table, 'unittest_' ) !== 0;
1391         }
1392
1393         /**
1394          * @since 1.18
1395          *
1396          * @param IMaintainableDatabase $db
1397          *
1398          * @return array
1399          */
1400         public static function listTables( IMaintainableDatabase $db ) {
1401                 $prefix = $db->tablePrefix();
1402                 $tables = $db->listTables( $prefix, __METHOD__ );
1403
1404                 if ( $db->getType() === 'mysql' ) {
1405                         static $viewListCache = null;
1406                         if ( $viewListCache === null ) {
1407                                 $viewListCache = $db->listViews( null, __METHOD__ );
1408                         }
1409                         // T45571: cannot clone VIEWs under MySQL
1410                         $tables = array_diff( $tables, $viewListCache );
1411                 }
1412                 array_walk( $tables, [ __CLASS__, 'unprefixTable' ], $prefix );
1413
1414                 // Don't duplicate test tables from the previous fataled run
1415                 $tables = array_filter( $tables, [ __CLASS__, 'isNotUnittest' ] );
1416
1417                 if ( $db->getType() == 'sqlite' ) {
1418                         $tables = array_flip( $tables );
1419                         // these are subtables of searchindex and don't need to be duped/dropped separately
1420                         unset( $tables['searchindex_content'] );
1421                         unset( $tables['searchindex_segdir'] );
1422                         unset( $tables['searchindex_segments'] );
1423                         $tables = array_flip( $tables );
1424                 }
1425
1426                 return $tables;
1427         }
1428
1429         /**
1430          * @throws MWException
1431          * @since 1.18
1432          */
1433         protected function checkDbIsSupported() {
1434                 if ( !in_array( $this->db->getType(), $this->supportedDBs ) ) {
1435                         throw new MWException( $this->db->getType() . " is not currently supported for unit testing." );
1436                 }
1437         }
1438
1439         /**
1440          * @since 1.18
1441          * @param string $offset
1442          * @return mixed
1443          */
1444         public function getCliArg( $offset ) {
1445                 if ( isset( PHPUnitMaintClass::$additionalOptions[$offset] ) ) {
1446                         return PHPUnitMaintClass::$additionalOptions[$offset];
1447                 }
1448
1449                 return null;
1450         }
1451
1452         /**
1453          * @since 1.18
1454          * @param string $offset
1455          * @param mixed $value
1456          */
1457         public function setCliArg( $offset, $value ) {
1458                 PHPUnitMaintClass::$additionalOptions[$offset] = $value;
1459         }
1460
1461         /**
1462          * Don't throw a warning if $function is deprecated and called later
1463          *
1464          * @since 1.19
1465          *
1466          * @param string $function
1467          */
1468         public function hideDeprecated( $function ) {
1469                 MediaWiki\suppressWarnings();
1470                 wfDeprecated( $function );
1471                 MediaWiki\restoreWarnings();
1472         }
1473
1474         /**
1475          * Asserts that the given database query yields the rows given by $expectedRows.
1476          * The expected rows should be given as indexed (not associative) arrays, with
1477          * the values given in the order of the columns in the $fields parameter.
1478          * Note that the rows are sorted by the columns given in $fields.
1479          *
1480          * @since 1.20
1481          *
1482          * @param string|array $table The table(s) to query
1483          * @param string|array $fields The columns to include in the result (and to sort by)
1484          * @param string|array $condition "where" condition(s)
1485          * @param array $expectedRows An array of arrays giving the expected rows.
1486          *
1487          * @throws MWException If this test cases's needsDB() method doesn't return true.
1488          *         Test cases can use "@group Database" to enable database test support,
1489          *         or list the tables under testing in $this->tablesUsed, or override the
1490          *         needsDB() method.
1491          */
1492         protected function assertSelect( $table, $fields, $condition, array $expectedRows ) {
1493                 if ( !$this->needsDB() ) {
1494                         throw new MWException( 'When testing database state, the test cases\'s needDB()' .
1495                                 ' method should return true. Use @group Database or $this->tablesUsed.' );
1496                 }
1497
1498                 $db = wfGetDB( DB_REPLICA );
1499
1500                 $res = $db->select( $table, $fields, $condition, wfGetCaller(), [ 'ORDER BY' => $fields ] );
1501                 $this->assertNotEmpty( $res, "query failed: " . $db->lastError() );
1502
1503                 $i = 0;
1504
1505                 foreach ( $expectedRows as $expected ) {
1506                         $r = $res->fetchRow();
1507                         self::stripStringKeys( $r );
1508
1509                         $i += 1;
1510                         $this->assertNotEmpty( $r, "row #$i missing" );
1511
1512                         $this->assertEquals( $expected, $r, "row #$i mismatches" );
1513                 }
1514
1515                 $r = $res->fetchRow();
1516                 self::stripStringKeys( $r );
1517
1518                 $this->assertFalse( $r, "found extra row (after #$i)" );
1519         }
1520
1521         /**
1522          * Utility method taking an array of elements and wrapping
1523          * each element in its own array. Useful for data providers
1524          * that only return a single argument.
1525          *
1526          * @since 1.20
1527          *
1528          * @param array $elements
1529          *
1530          * @return array
1531          */
1532         protected function arrayWrap( array $elements ) {
1533                 return array_map(
1534                         function ( $element ) {
1535                                 return [ $element ];
1536                         },
1537                         $elements
1538                 );
1539         }
1540
1541         /**
1542          * Assert that two arrays are equal. By default this means that both arrays need to hold
1543          * the same set of values. Using additional arguments, order and associated key can also
1544          * be set as relevant.
1545          *
1546          * @since 1.20
1547          *
1548          * @param array $expected
1549          * @param array $actual
1550          * @param bool $ordered If the order of the values should match
1551          * @param bool $named If the keys should match
1552          */
1553         protected function assertArrayEquals( array $expected, array $actual,
1554                 $ordered = false, $named = false
1555         ) {
1556                 if ( !$ordered ) {
1557                         $this->objectAssociativeSort( $expected );
1558                         $this->objectAssociativeSort( $actual );
1559                 }
1560
1561                 if ( !$named ) {
1562                         $expected = array_values( $expected );
1563                         $actual = array_values( $actual );
1564                 }
1565
1566                 call_user_func_array(
1567                         [ $this, 'assertEquals' ],
1568                         array_merge( [ $expected, $actual ], array_slice( func_get_args(), 4 ) )
1569                 );
1570         }
1571
1572         /**
1573          * Put each HTML element on its own line and then equals() the results
1574          *
1575          * Use for nicely formatting of PHPUnit diff output when comparing very
1576          * simple HTML
1577          *
1578          * @since 1.20
1579          *
1580          * @param string $expected HTML on oneline
1581          * @param string $actual HTML on oneline
1582          * @param string $msg Optional message
1583          */
1584         protected function assertHTMLEquals( $expected, $actual, $msg = '' ) {
1585                 $expected = str_replace( '>', ">\n", $expected );
1586                 $actual = str_replace( '>', ">\n", $actual );
1587
1588                 $this->assertEquals( $expected, $actual, $msg );
1589         }
1590
1591         /**
1592          * Does an associative sort that works for objects.
1593          *
1594          * @since 1.20
1595          *
1596          * @param array &$array
1597          */
1598         protected function objectAssociativeSort( array &$array ) {
1599                 uasort(
1600                         $array,
1601                         function ( $a, $b ) {
1602                                 return serialize( $a ) > serialize( $b ) ? 1 : -1;
1603                         }
1604                 );
1605         }
1606
1607         /**
1608          * Utility function for eliminating all string keys from an array.
1609          * Useful to turn a database result row as returned by fetchRow() into
1610          * a pure indexed array.
1611          *
1612          * @since 1.20
1613          *
1614          * @param mixed &$r The array to remove string keys from.
1615          */
1616         protected static function stripStringKeys( &$r ) {
1617                 if ( !is_array( $r ) ) {
1618                         return;
1619                 }
1620
1621                 foreach ( $r as $k => $v ) {
1622                         if ( is_string( $k ) ) {
1623                                 unset( $r[$k] );
1624                         }
1625                 }
1626         }
1627
1628         /**
1629          * Asserts that the provided variable is of the specified
1630          * internal type or equals the $value argument. This is useful
1631          * for testing return types of functions that return a certain
1632          * type or *value* when not set or on error.
1633          *
1634          * @since 1.20
1635          *
1636          * @param string $type
1637          * @param mixed $actual
1638          * @param mixed $value
1639          * @param string $message
1640          */
1641         protected function assertTypeOrValue( $type, $actual, $value = false, $message = '' ) {
1642                 if ( $actual === $value ) {
1643                         $this->assertTrue( true, $message );
1644                 } else {
1645                         $this->assertType( $type, $actual, $message );
1646                 }
1647         }
1648
1649         /**
1650          * Asserts the type of the provided value. This can be either
1651          * in internal type such as boolean or integer, or a class or
1652          * interface the value extends or implements.
1653          *
1654          * @since 1.20
1655          *
1656          * @param string $type
1657          * @param mixed $actual
1658          * @param string $message
1659          */
1660         protected function assertType( $type, $actual, $message = '' ) {
1661                 if ( class_exists( $type ) || interface_exists( $type ) ) {
1662                         $this->assertInstanceOf( $type, $actual, $message );
1663                 } else {
1664                         $this->assertInternalType( $type, $actual, $message );
1665                 }
1666         }
1667
1668         /**
1669          * Returns true if the given namespace defaults to Wikitext
1670          * according to $wgNamespaceContentModels
1671          *
1672          * @param int $ns The namespace ID to check
1673          *
1674          * @return bool
1675          * @since 1.21
1676          */
1677         protected function isWikitextNS( $ns ) {
1678                 global $wgNamespaceContentModels;
1679
1680                 if ( isset( $wgNamespaceContentModels[$ns] ) ) {
1681                         return $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT;
1682                 }
1683
1684                 return true;
1685         }
1686
1687         /**
1688          * Returns the ID of a namespace that defaults to Wikitext.
1689          *
1690          * @throws MWException If there is none.
1691          * @return int The ID of the wikitext Namespace
1692          * @since 1.21
1693          */
1694         protected function getDefaultWikitextNS() {
1695                 global $wgNamespaceContentModels;
1696
1697                 static $wikitextNS = null; // this is not going to change
1698                 if ( $wikitextNS !== null ) {
1699                         return $wikitextNS;
1700                 }
1701
1702                 // quickly short out on most common case:
1703                 if ( !isset( $wgNamespaceContentModels[NS_MAIN] ) ) {
1704                         return NS_MAIN;
1705                 }
1706
1707                 // NOTE: prefer content namespaces
1708                 $namespaces = array_unique( array_merge(
1709                         MWNamespace::getContentNamespaces(),
1710                         [ NS_MAIN, NS_HELP, NS_PROJECT ], // prefer these
1711                         MWNamespace::getValidNamespaces()
1712                 ) );
1713
1714                 $namespaces = array_diff( $namespaces, [
1715                         NS_FILE, NS_CATEGORY, NS_MEDIAWIKI, NS_USER // don't mess with magic namespaces
1716                 ] );
1717
1718                 $talk = array_filter( $namespaces, function ( $ns ) {
1719                         return MWNamespace::isTalk( $ns );
1720                 } );
1721
1722                 // prefer non-talk pages
1723                 $namespaces = array_diff( $namespaces, $talk );
1724                 $namespaces = array_merge( $namespaces, $talk );
1725
1726                 // check default content model of each namespace
1727                 foreach ( $namespaces as $ns ) {
1728                         if ( !isset( $wgNamespaceContentModels[$ns] ) ||
1729                                 $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT
1730                         ) {
1731                                 $wikitextNS = $ns;
1732
1733                                 return $wikitextNS;
1734                         }
1735                 }
1736
1737                 // give up
1738                 // @todo Inside a test, we could skip the test as incomplete.
1739                 //        But frequently, this is used in fixture setup.
1740                 throw new MWException( "No namespace defaults to wikitext!" );
1741         }
1742
1743         /**
1744          * Check, if $wgDiff3 is set and ready to merge
1745          * Will mark the calling test as skipped, if not ready
1746          *
1747          * @since 1.21
1748          */
1749         protected function markTestSkippedIfNoDiff3() {
1750                 global $wgDiff3;
1751
1752                 # This check may also protect against code injection in
1753                 # case of broken installations.
1754                 MediaWiki\suppressWarnings();
1755                 $haveDiff3 = $wgDiff3 && file_exists( $wgDiff3 );
1756                 MediaWiki\restoreWarnings();
1757
1758                 if ( !$haveDiff3 ) {
1759                         $this->markTestSkipped( "Skip test, since diff3 is not configured" );
1760                 }
1761         }
1762
1763         /**
1764          * Check if $extName is a loaded PHP extension, will skip the
1765          * test whenever it is not loaded.
1766          *
1767          * @since 1.21
1768          * @param string $extName
1769          * @return bool
1770          */
1771         protected function checkPHPExtension( $extName ) {
1772                 $loaded = extension_loaded( $extName );
1773                 if ( !$loaded ) {
1774                         $this->markTestSkipped( "PHP extension '$extName' is not loaded, skipping." );
1775                 }
1776
1777                 return $loaded;
1778         }
1779
1780         /**
1781          * Asserts that the given string is a valid HTML snippet.
1782          * Wraps the given string in the required top level tags and
1783          * then calls assertValidHtmlDocument().
1784          * The snippet is expected to be HTML 5.
1785          *
1786          * @since 1.23
1787          *
1788          * @note Will mark the test as skipped if the "tidy" module is not installed.
1789          * @note This ignores $wgUseTidy, so we can check for valid HTML even (and especially)
1790          *        when automatic tidying is disabled.
1791          *
1792          * @param string $html An HTML snippet (treated as the contents of the body tag).
1793          */
1794         protected function assertValidHtmlSnippet( $html ) {
1795                 $html = '<!DOCTYPE html><html><head><title>test</title></head><body>' . $html . '</body></html>';
1796                 $this->assertValidHtmlDocument( $html );
1797         }
1798
1799         /**
1800          * Asserts that the given string is valid HTML document.
1801          *
1802          * @since 1.23
1803          *
1804          * @note Will mark the test as skipped if the "tidy" module is not installed.
1805          * @note This ignores $wgUseTidy, so we can check for valid HTML even (and especially)
1806          *        when automatic tidying is disabled.
1807          *
1808          * @param string $html A complete HTML document
1809          */
1810         protected function assertValidHtmlDocument( $html ) {
1811                 // Note: we only validate if the tidy PHP extension is available.
1812                 // In case wgTidyInternal is false, MWTidy would fall back to the command line version
1813                 // of tidy. In that case however, we can not reliably detect whether a failing validation
1814                 // is due to malformed HTML, or caused by tidy not being installed as a command line tool.
1815                 // That would cause all HTML assertions to fail on a system that has no tidy installed.
1816                 if ( !$GLOBALS['wgTidyInternal'] || !MWTidy::isEnabled() ) {
1817                         $this->markTestSkipped( 'Tidy extension not installed' );
1818                 }
1819
1820                 $errorBuffer = '';
1821                 MWTidy::checkErrors( $html, $errorBuffer );
1822                 $allErrors = preg_split( '/[\r\n]+/', $errorBuffer );
1823
1824                 // Filter Tidy warnings which aren't useful for us.
1825                 // Tidy eg. often cries about parameters missing which have actually
1826                 // been deprecated since HTML4, thus we should not care about them.
1827                 $errors = preg_grep(
1828                         '/^(.*Warning: (trimming empty|.* lacks ".*?" attribute).*|\s*)$/m',
1829                         $allErrors, PREG_GREP_INVERT
1830                 );
1831
1832                 $this->assertEmpty( $errors, implode( "\n", $errors ) );
1833         }
1834
1835         /**
1836          * Used as a marker to prevent wfResetOutputBuffers from breaking PHPUnit.
1837          * @param string $buffer
1838          * @return string
1839          */
1840         public static function wfResetOutputBuffersBarrier( $buffer ) {
1841                 return $buffer;
1842         }
1843
1844         /**
1845          * Create a temporary hook handler which will be reset by tearDown.
1846          * This replaces other handlers for the same hook.
1847          * @param string $hookName Hook name
1848          * @param mixed $handler Value suitable for a hook handler
1849          * @since 1.28
1850          */
1851         protected function setTemporaryHook( $hookName, $handler ) {
1852                 $this->mergeMwGlobalArrayValue( 'wgHooks', [ $hookName => [ $handler ] ] );
1853         }
1854
1855         /**
1856          * Check whether file contains given data.
1857          * @param string $fileName
1858          * @param string $actualData
1859          * @param bool $createIfMissing If true, and file does not exist, create it with given data
1860          *                              and skip the test.
1861          * @param string $msg
1862          * @since 1.30
1863          */
1864         protected function assertFileContains(
1865                 $fileName,
1866                 $actualData,
1867                 $createIfMissing = true,
1868                 $msg = ''
1869         ) {
1870                 if ( $createIfMissing ) {
1871                         if ( !file_exists( $fileName ) ) {
1872                                 file_put_contents( $fileName, $actualData );
1873                                 $this->markTestSkipped( 'Data file $fileName does not exist' );
1874                         }
1875                 } else {
1876                         self::assertFileExists( $fileName );
1877                 }
1878                 self::assertEquals( file_get_contents( $fileName ), $actualData, $msg );
1879         }
1880 }