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