tests/phpunit/MediaWikiTestCase.php

   1 <?php
   2
   3 use MediaWiki\Logger\LegacySpi;
   4 use MediaWiki\Logger\LoggerFactory;
   5 use MediaWiki\Logger\MonologSpi;
   6 use MediaWiki\MediaWikiServices;
   7 use Psr\Log\LoggerInterface;
   8 use Wikimedia\Rdbms\IDatabase;
   9 use Wikimedia\Rdbms\IMaintainableDatabase;
  10 use Wikimedia\Rdbms\Database;
  11 use Wikimedia\TestingAccessWrapper;
  12
  13 /**
  14  * @since 1.18
  15  */
  16 abstract class MediaWikiTestCase extends PHPUnit\Framework\TestCase {
  17
  18         use MediaWikiCoversValidator;
  19         use PHPUnit4And6Compat;
  20
  21         /**
  22          * The original service locator. This is overridden during setUp().
  23          *
  24          * @var MediaWikiServices|null
  25          */
  26         private static $originalServices;
  27
  28         /**
  29          * The local service locator, created during setUp().
  30          * @var MediaWikiServices
  31          */
  32         private $localServices;
  33
  34         /**
  35          * $called tracks whether the setUp and tearDown method has been called.
  36          * class extending MediaWikiTestCase usually override setUp and tearDown
  37          * but forget to call the parent.
  38          *
  39          * The array format takes a method name as key and anything as a value.
  40          * By asserting the key exist, we know the child class has called the
  41          * parent.
  42          *
  43          * This property must be private, we do not want child to override it,
  44          * they should call the appropriate parent method instead.
  45          */
  46         private $called = [];
  47
  48         /**
  49          * @var TestUser[]
  50          * @since 1.20
  51          */
  52         public static $users;
  53
  54         /**
  55          * Primary database
  56          *
  57          * @var Database
  58          * @since 1.18
  59          */
  60         protected $db;
  61
  62         /**
  63          * @var array
  64          * @since 1.19
  65          */
  66         protected $tablesUsed = []; // tables with data
  67
  68         private static $useTemporaryTables = true;
  69         private static $reuseDB = false;
  70         private static $dbSetup = false;
  71         private static $oldTablePrefix = '';
  72
  73         /**
  74          * Original value of PHP's error_reporting setting.
  75          *
  76          * @var int
  77          */
  78         private $phpErrorLevel;
  79
  80         /**
  81          * Holds the paths of temporary files/directories created through getNewTempFile,
  82          * and getNewTempDirectory
  83          *
  84          * @var array
  85          */
  86         private $tmpFiles = [];
  87
  88         /**
  89          * Holds original values of MediaWiki configuration settings
  90          * to be restored in tearDown().
  91          * See also setMwGlobals().
  92          * @var array
  93          */
  94         private $mwGlobals = [];
  95
  96         /**
  97          * Holds list of MediaWiki configuration settings to be unset in tearDown().
  98          * See also setMwGlobals().
  99          * @var array
 100          */
 101         private $mwGlobalsToUnset = [];
 102
 103         /**
 104          * Holds original loggers which have been replaced by setLogger()
 105          * @var LoggerInterface[]
 106          */
 107         private $loggers = [];
 108
 109         /**
 110          * The CLI arguments passed through from phpunit.php
 111          * @var array
 112          */
 113         private $cliArgs = [];
 114
 115         /**
 116          * Table name prefixes. Oracle likes it shorter.
 117          */
 118         const DB_PREFIX = 'unittest_';
 119         const ORA_DB_PREFIX = 'ut_';
 120
 121         /**
 122          * @var array
 123          * @since 1.18
 124          */
 125         protected $supportedDBs = [
 126                 'mysql',
 127                 'sqlite',
 128                 'postgres',
 129                 'oracle'
 130         ];
 131
 132         public function __construct( $name = null, array $data = [], $dataName = '' ) {
 133                 parent::__construct( $name, $data, $dataName );
 134
 135                 $this->backupGlobals = false;
 136                 $this->backupStaticAttributes = false;
 137         }
 138
 139         public function __destruct() {
 140                 // Complain if self::setUp() was called, but not self::tearDown()
 141                 // $this->called['setUp'] will be checked by self::testMediaWikiTestCaseParentSetupCalled()
 142                 if ( isset( $this->called['setUp'] ) && !isset( $this->called['tearDown'] ) ) {
 143                         throw new MWException( static::class . "::tearDown() must call parent::tearDown()" );
 144                 }
 145         }
 146
 147         public static function setUpBeforeClass() {
 148                 parent::setUpBeforeClass();
 149
 150                 // Get the original service locator
 151                 if ( !self::$originalServices ) {
 152                         self::$originalServices = MediaWikiServices::getInstance();
 153                 }
 154         }
 155
 156         /**
 157          * Convenience method for getting an immutable test user
 158          *
 159          * @since 1.28
 160          *
 161          * @param string[] $groups Groups the test user should be in.
 162          * @return TestUser
 163          */
 164         public static function getTestUser( $groups = [] ) {
 165                 return TestUserRegistry::getImmutableTestUser( $groups );
 166         }
 167
 168         /**
 169          * Convenience method for getting a mutable test user
 170          *
 171          * @since 1.28
 172          *
 173          * @param string[] $groups Groups the test user should be added in.
 174          * @return TestUser
 175          */
 176         public static function getMutableTestUser( $groups = [] ) {
 177                 return TestUserRegistry::getMutableTestUser( __CLASS__, $groups );
 178         }
 179
 180         /**
 181          * Convenience method for getting an immutable admin test user
 182          *
 183          * @since 1.28
 184          *
 185          * @param string[] $groups Groups the test user should be added to.
 186          * @return TestUser
 187          */
 188         public static function getTestSysop() {
 189                 return self::getTestUser( [ 'sysop', 'bureaucrat' ] );
 190         }
 191
 192         /**
 193          * Returns a WikiPage representing an existing page.
 194          *
 195          * @since 1.32
 196          *
 197          * @param Title|string|null $title
 198          * @return WikiPage
 199          * @throws MWException
 200          */
 201         protected function getExistingTestPage( $title = null ) {
 202                 $title = ( $title === null ) ? 'UTPage' : $title;
 203                 $title = is_string( $title ) ? Title::newFromText( $title ) : $title;
 204                 $page = WikiPage::factory( $title );
 205
 206                 if ( !$page->exists() ) {
 207                         $user = self::getTestSysop()->getUser();
 208                         $page->doEditContent(
 209                                 new WikitextContent( 'UTContent' ),
 210                                 'UTPageSummary',
 211                                 EDIT_NEW | EDIT_SUPPRESS_RC,
 212                                 false,
 213                                 $user
 214                         );
 215                 }
 216
 217                 return $page;
 218         }
 219
 220         /**
 221          * Returns a WikiPage representing a non-existing page.
 222          *
 223          * @since 1.32
 224          *
 225          * @param Title|string|null $title
 226          * @return WikiPage
 227          * @throws MWException
 228          */
 229         protected function getNonexistingTestPage( $title = null ) {
 230                 $title = ( $title === null ) ? 'UTPage-' . rand( 0, 100000 ) : $title;
 231                 $title = is_string( $title ) ? Title::newFromText( $title ) : $title;
 232                 $page = WikiPage::factory( $title );
 233
 234                 if ( $page->exists() ) {
 235                         $page->doDeleteArticle( 'Testing' );
 236                 }
 237
 238                 return $page;
 239         }
 240
 241         /**
 242          * @deprecated since 1.32
 243          */
 244         public static function prepareServices( Config $bootstrapConfig ) {
 245         }
 246
 247         /**
 248          * Create a config suitable for testing, based on a base config, default overrides,
 249          * and custom overrides.
 250          *
 251          * @param Config|null $baseConfig
 252          * @param Config|null $customOverrides
 253          *
 254          * @return Config
 255          */
 256         private static function makeTestConfig(
 257                 Config $baseConfig = null,
 258                 Config $customOverrides = null
 259         ) {
 260                 $defaultOverrides = new HashConfig();
 261
 262                 if ( !$baseConfig ) {
 263                         $baseConfig = self::$originalServices->getBootstrapConfig();
 264                 }
 265
 266                 /* Some functions require some kind of caching, and will end up using the db,
 267                  * which we can't allow, as that would open a new connection for mysql.
 268                  * Replace with a HashBag. They would not be going to persist anyway.
 269                  */
 270                 $hashCache = [ 'class' => HashBagOStuff::class, 'reportDupes' => false ];
 271                 $objectCaches = [
 272                                 CACHE_DB => $hashCache,
 273                                 CACHE_ACCEL => $hashCache,
 274                                 CACHE_MEMCACHED => $hashCache,
 275                                 'apc' => $hashCache,
 276                                 'apcu' => $hashCache,
 277                                 'wincache' => $hashCache,
 278                         ] + $baseConfig->get( 'ObjectCaches' );
 279
 280                 $defaultOverrides->set( 'ObjectCaches', $objectCaches );
 281                 $defaultOverrides->set( 'MainCacheType', CACHE_NONE );
 282                 $defaultOverrides->set( 'JobTypeConf', [ 'default' => [ 'class' => JobQueueMemory::class ] ] );
 283
 284                 // Use a fast hash algorithm to hash passwords.
 285                 $defaultOverrides->set( 'PasswordDefault', 'A' );
 286
 287                 $testConfig = $customOverrides
 288                         ? new MultiConfig( [ $customOverrides, $defaultOverrides, $baseConfig ] )
 289                         : new MultiConfig( [ $defaultOverrides, $baseConfig ] );
 290
 291                 return $testConfig;
 292         }
 293
 294         /**
 295          * @param ConfigFactory $oldFactory
 296          * @param Config[] $configurations
 297          *
 298          * @return Closure
 299          */
 300         private static function makeTestConfigFactoryInstantiator(
 301                 ConfigFactory $oldFactory,
 302                 array $configurations
 303         ) {
 304                 return function ( MediaWikiServices $services ) use ( $oldFactory, $configurations ) {
 305                         $factory = new ConfigFactory();
 306
 307                         // clone configurations from $oldFactory that are not overwritten by $configurations
 308                         $namesToClone = array_diff(
 309                                 $oldFactory->getConfigNames(),
 310                                 array_keys( $configurations )
 311                         );
 312
 313                         foreach ( $namesToClone as $name ) {
 314                                 $factory->register( $name, $oldFactory->makeConfig( $name ) );
 315                         }
 316
 317                         foreach ( $configurations as $name => $config ) {
 318                                 $factory->register( $name, $config );
 319                         }
 320
 321                         return $factory;
 322                 };
 323         }
 324
 325         /**
 326          * Resets some non-service singleton instances and other static caches. It's not necessary to
 327          * reset services here.
 328          */
 329         public static function resetNonServiceCaches() {
 330                 global $wgRequest, $wgJobClasses;
 331
 332                 foreach ( $wgJobClasses as $type => $class ) {
 333                         JobQueueGroup::singleton()->get( $type )->delete();
 334                 }
 335                 JobQueueGroup::destroySingletons();
 336
 337                 ObjectCache::clear();
 338                 FileBackendGroup::destroySingleton();
 339                 DeferredUpdates::clearPendingUpdates();
 340
 341                 // TODO: move global state into MediaWikiServices
 342                 RequestContext::resetMain();
 343                 if ( session_id() !== '' ) {
 344                         session_write_close();
 345                         session_id( '' );
 346                 }
 347
 348                 $wgRequest = new FauxRequest();
 349                 MediaWiki\Session\SessionManager::resetCache();
 350         }
 351
 352         public function run( PHPUnit_Framework_TestResult $result = null ) {
 353                 if ( $result instanceof MediaWikiTestResult ) {
 354                         $this->cliArgs = $result->getMediaWikiCliArgs();
 355                 }
 356                 $this->overrideMwServices();
 357
 358                 if ( $this->needsDB() && !$this->isTestInDatabaseGroup() ) {
 359                         throw new Exception(
 360                                 get_class( $this ) . ' apparently needsDB but is not in the Database group'
 361                         );
 362                 }
 363
 364                 $needsResetDB = false;
 365                 if ( !self::$dbSetup || $this->needsDB() ) {
 366                         // set up a DB connection for this test to use
 367
 368                         self::$useTemporaryTables = !$this->getCliArg( 'use-normal-tables' );
 369                         self::$reuseDB = $this->getCliArg( 'reuse-db' );
 370
 371                         $this->db = wfGetDB( DB_MASTER );
 372
 373                         $this->checkDbIsSupported();
 374
 375                         if ( !self::$dbSetup ) {
 376                                 $this->setupAllTestDBs();
 377                                 $this->addCoreDBData();
 378                         }
 379
 380                         // TODO: the DB setup should be done in setUpBeforeClass(), so the test DB
 381                         // is available in subclass's setUpBeforeClass() and setUp() methods.
 382                         // This would also remove the need for the HACK that is oncePerClass().
 383                         if ( $this->oncePerClass() ) {
 384                                 $this->setUpSchema( $this->db );
 385                                 $this->resetDB( $this->db, $this->tablesUsed );
 386                                 $this->addDBDataOnce();
 387                         }
 388
 389                         $this->addDBData();
 390                         $needsResetDB = true;
 391                 }
 392
 393                 parent::run( $result );
 394
 395                 if ( $needsResetDB ) {
 396                         $this->resetDB( $this->db, $this->tablesUsed );
 397                 }
 398
 399                 self::restoreMwServices();
 400                 $this->localServices = null;
 401         }
 402
 403         /**
 404          * @return bool
 405          */
 406         private function oncePerClass() {
 407                 // Remember current test class in the database connection,
 408                 // so we know when we need to run addData.
 409
 410                 $class = static::class;
 411
 412                 $first = !isset( $this->db->_hasDataForTestClass )
 413                         || $this->db->_hasDataForTestClass !== $class;
 414
 415                 $this->db->_hasDataForTestClass = $class;
 416                 return $first;
 417         }
 418
 419         /**
 420          * @since 1.21
 421          *
 422          * @return bool
 423          */
 424         public function usesTemporaryTables() {
 425                 return self::$useTemporaryTables;
 426         }
 427
 428         /**
 429          * Obtains a new temporary file name
 430          *
 431          * The obtained filename is enlisted to be removed upon tearDown
 432          *
 433          * @since 1.20
 434          *
 435          * @return string Absolute name of the temporary file
 436          */
 437         protected function getNewTempFile() {
 438                 $fileName = tempnam( wfTempDir(), 'MW_PHPUnit_' . static::class . '_' );
 439                 $this->tmpFiles[] = $fileName;
 440
 441                 return $fileName;
 442         }
 443
 444         /**
 445          * obtains a new temporary directory
 446          *
 447          * The obtained directory is enlisted to be removed (recursively with all its contained
 448          * files) upon tearDown.
 449          *
 450          * @since 1.20
 451          *
 452          * @return string Absolute name of the temporary directory
 453          */
 454         protected function getNewTempDirectory() {
 455                 // Starting of with a temporary /file/.
 456                 $fileName = $this->getNewTempFile();
 457
 458                 // Converting the temporary /file/ to a /directory/
 459                 // The following is not atomic, but at least we now have a single place,
 460                 // where temporary directory creation is bundled and can be improved
 461                 unlink( $fileName );
 462                 $this->assertTrue( wfMkdirParents( $fileName ) );
 463
 464                 return $fileName;
 465         }
 466
 467         protected function setUp() {
 468                 parent::setUp();
 469                 $this->called['setUp'] = true;
 470
 471                 $this->phpErrorLevel = intval( ini_get( 'error_reporting' ) );
 472
 473                 // Cleaning up temporary files
 474                 foreach ( $this->tmpFiles as $fileName ) {
 475                         if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
 476                                 unlink( $fileName );
 477                         } elseif ( is_dir( $fileName ) ) {
 478                                 wfRecursiveRemoveDir( $fileName );
 479                         }
 480                 }
 481
 482                 if ( $this->needsDB() && $this->db ) {
 483                         // Clean up open transactions
 484                         while ( $this->db->trxLevel() > 0 ) {
 485                                 $this->db->rollback( __METHOD__, 'flush' );
 486                         }
 487                         // Check for unsafe queries
 488                         if ( $this->db->getType() === 'mysql' ) {
 489                                 $this->db->query( "SET sql_mode = 'STRICT_ALL_TABLES'", __METHOD__ );
 490                         }
 491                 }
 492
 493                 // Reset all caches between tests.
 494                 self::resetNonServiceCaches();
 495
 496                 // XXX: reset maintenance triggers
 497                 // Hook into period lag checks which often happen in long-running scripts
 498                 $lbFactory = $this->localServices->getDBLoadBalancerFactory();
 499                 Maintenance::setLBFactoryTriggers( $lbFactory, $this->localServices->getMainConfig() );
 500
 501                 ob_start( 'MediaWikiTestCase::wfResetOutputBuffersBarrier' );
 502         }
 503
 504         protected function addTmpFiles( $files ) {
 505                 $this->tmpFiles = array_merge( $this->tmpFiles, (array)$files );
 506         }
 507
 508         protected function tearDown() {
 509                 global $wgRequest, $wgSQLMode;
 510
 511                 $status = ob_get_status();
 512                 if ( isset( $status['name'] ) &&
 513                         $status['name'] === 'MediaWikiTestCase::wfResetOutputBuffersBarrier'
 514                 ) {
 515                         ob_end_flush();
 516                 }
 517
 518                 $this->called['tearDown'] = true;
 519                 // Cleaning up temporary files
 520                 foreach ( $this->tmpFiles as $fileName ) {
 521                         if ( is_file( $fileName ) || ( is_link( $fileName ) ) ) {
 522                                 unlink( $fileName );
 523                         } elseif ( is_dir( $fileName ) ) {
 524                                 wfRecursiveRemoveDir( $fileName );
 525                         }
 526                 }
 527
 528                 if ( $this->needsDB() && $this->db ) {
 529                         // Clean up open transactions
 530                         while ( $this->db->trxLevel() > 0 ) {
 531                                 $this->db->rollback( __METHOD__, 'flush' );
 532                         }
 533                         if ( $this->db->getType() === 'mysql' ) {
 534                                 $this->db->query( "SET sql_mode = " . $this->db->addQuotes( $wgSQLMode ),
 535                                         __METHOD__ );
 536                         }
 537                 }
 538
 539                 // Restore mw globals
 540                 foreach ( $this->mwGlobals as $key => $value ) {
 541                         $GLOBALS[$key] = $value;
 542                 }
 543                 foreach ( $this->mwGlobalsToUnset as $value ) {
 544                         unset( $GLOBALS[$value] );
 545                 }
 546                 if (
 547                         array_key_exists( 'wgExtraNamespaces', $this->mwGlobals ) ||
 548                         in_array( 'wgExtraNamespaces', $this->mwGlobalsToUnset )
 549                 ) {
 550                         $this->resetNamespaces();
 551                 }
 552                 $this->mwGlobals = [];
 553                 $this->mwGlobalsToUnset = [];
 554                 $this->restoreLoggers();
 555
 556                 // TODO: move global state into MediaWikiServices
 557                 RequestContext::resetMain();
 558                 if ( session_id() !== '' ) {
 559                         session_write_close();
 560                         session_id( '' );
 561                 }
 562                 $wgRequest = new FauxRequest();
 563                 MediaWiki\Session\SessionManager::resetCache();
 564                 MediaWiki\Auth\AuthManager::resetCache();
 565
 566                 $phpErrorLevel = intval( ini_get( 'error_reporting' ) );
 567
 568                 if ( $phpErrorLevel !== $this->phpErrorLevel ) {
 569                         ini_set( 'error_reporting', $this->phpErrorLevel );
 570
 571                         $oldHex = strtoupper( dechex( $this->phpErrorLevel ) );
 572                         $newHex = strtoupper( dechex( $phpErrorLevel ) );
 573                         $message = "PHP error_reporting setting was left dirty: "
 574                                 . "was 0x$oldHex before test, 0x$newHex after test!";
 575
 576                         $this->fail( $message );
 577                 }
 578
 579                 parent::tearDown();
 580         }
 581
 582         /**
 583          * Make sure MediaWikiTestCase extending classes have called their
 584          * parent setUp method
 585          *
 586          * With strict coverage activated in PHP_CodeCoverage, this test would be
 587          * marked as risky without the following annotation (T152923).
 588          * @coversNothing
 589          */
 590         final public function testMediaWikiTestCaseParentSetupCalled() {
 591                 $this->assertArrayHasKey( 'setUp', $this->called,
 592                         static::class . '::setUp() must call parent::setUp()'
 593                 );
 594         }
 595
 596         /**
 597          * Sets a service, maintaining a stashed version of the previous service to be
 598          * restored in tearDown
 599          *
 600          * @since 1.27
 601          *
 602          * @param string $name
 603          * @param object $object
 604          */
 605         protected function setService( $name, $object ) {
 606                 if ( !$this->localServices ) {
 607                         throw new Exception( __METHOD__ . ' must be called after MediaWikiTestCase::run()' );
 608                 }
 609
 610                 if ( $this->localServices !== MediaWikiServices::getInstance() ) {
 611                         throw new Exception( __METHOD__ . ' will not work because the global MediaWikiServices '
 612                                 . 'instance has been replaced by test code.' );
 613                 }
 614
 615                 $this->localServices->disableService( $name );
 616                 $this->localServices->redefineService(
 617                         $name,
 618                         function () use ( $object ) {
 619                                 return $object;
 620                         }
 621                 );
 622
 623                 if ( $name === 'ContentLanguage' ) {
 624                         $this->doSetMwGlobals( [ 'wgContLang' => $object ] );
 625                 }
 626         }
 627
 628         /**
 629          * Sets a global, maintaining a stashed version of the previous global to be
 630          * restored in tearDown
 631          *
 632          * The key is added to the array of globals that will be reset afterwards
 633          * in the tearDown().
 634          *
 635          * @par Example
 636          * @code
 637          *     protected function setUp() {
 638          *         $this->setMwGlobals( 'wgRestrictStuff', true );
 639          *     }
 640          *
 641          *     function testFoo() {}
 642          *
 643          *     function testBar() {}
 644          *         $this->assertTrue( self::getX()->doStuff() );
 645          *
 646          *         $this->setMwGlobals( 'wgRestrictStuff', false );
 647          *         $this->assertTrue( self::getX()->doStuff() );
 648          *     }
 649          *
 650          *     function testQuux() {}
 651          * @endcode
 652          *
 653          * @param array|string $pairs Key to the global variable, or an array
 654          *  of key/value pairs.
 655          * @param mixed|null $value Value to set the global to (ignored
 656          *  if an array is given as first argument).
 657          *
 658          * @note To allow changes to global variables to take effect on global service instances,
 659          *       call overrideMwServices().
 660          *
 661          * @since 1.21
 662          */
 663         protected function setMwGlobals( $pairs, $value = null ) {
 664                 if ( is_string( $pairs ) ) {
 665                         $pairs = [ $pairs => $value ];
 666                 }
 667
 668                 if ( isset( $pairs['wgContLang'] ) ) {
 669                         throw new MWException(
 670                                 'No setting $wgContLang, use setContentLang() or setService( \'ContentLanguage\' )'
 671                         );
 672                 }
 673
 674                 $this->doSetMwGlobals( $pairs, $value );
 675         }
 676
 677         /**
 678          * An internal method that allows setService() to set globals that tests are not supposed to
 679          * touch.
 680          */
 681         private function doSetMwGlobals( $pairs, $value = null ) {
 682                 $this->stashMwGlobals( array_keys( $pairs ) );
 683
 684                 foreach ( $pairs as $key => $value ) {
 685                         $GLOBALS[$key] = $value;
 686                 }
 687
 688                 if ( array_key_exists( 'wgExtraNamespaces', $pairs ) ) {
 689                         $this->resetNamespaces();
 690                 }
 691         }
 692
 693         /**
 694          * Must be called whenever namespaces are changed, e.g., $wgExtraNamespaces is altered.
 695          * Otherwise old namespace data will lurk and cause bugs.
 696          */
 697         private function resetNamespaces() {
 698                 if ( !$this->localServices ) {
 699                         throw new Exception( __METHOD__ . ' must be called after MediaWikiTestCase::run()' );
 700                 }
 701
 702                 if ( $this->localServices !== MediaWikiServices::getInstance() ) {
 703                         throw new Exception( __METHOD__ . ' will not work because the global MediaWikiServices '
 704                                 . 'instance has been replaced by test code.' );
 705                 }
 706
 707                 MWNamespace::clearCaches();
 708                 Language::clearCaches();
 709
 710                 // We can't have the TitleFormatter holding on to an old Language object either
 711                 // @todo We shouldn't need to reset all the aliases here.
 712                 $this->localServices->resetServiceForTesting( 'TitleFormatter' );
 713                 $this->localServices->resetServiceForTesting( 'TitleParser' );
 714                 $this->localServices->resetServiceForTesting( '_MediaWikiTitleCodec' );
 715         }
 716
 717         /**
 718          * Check if we can back up a value by performing a shallow copy.
 719          * Values which fail this test are copied recursively.
 720          *
 721          * @param mixed $value
 722          * @return bool True if a shallow copy will do; false if a deep copy
 723          *  is required.
 724          */
 725         private static function canShallowCopy( $value ) {
 726                 if ( is_scalar( $value ) || $value === null ) {
 727                         return true;
 728                 }
 729                 if ( is_array( $value ) ) {
 730                         foreach ( $value as $subValue ) {
 731                                 if ( !is_scalar( $subValue ) && $subValue !== null ) {
 732                                         return false;
 733                                 }
 734                         }
 735                         return true;
 736                 }
 737                 return false;
 738         }
 739
 740         /**
 741          * Stashes the global, will be restored in tearDown()
 742          *
 743          * Individual test functions may override globals through the setMwGlobals() function
 744          * or directly. When directly overriding globals their keys should first be passed to this
 745          * method in setUp to avoid breaking global state for other tests
 746          *
 747          * That way all other tests are executed with the same settings (instead of using the
 748          * unreliable local settings for most tests and fix it only for some tests).
 749          *
 750          * @param array|string $globalKeys Key to the global variable, or an array of keys.
 751          *
 752          * @note To allow changes to global variables to take effect on global service instances,
 753          *       call overrideMwServices().
 754          *
 755          * @since 1.23
 756          */
 757         protected function stashMwGlobals( $globalKeys ) {
 758                 if ( is_string( $globalKeys ) ) {
 759                         $globalKeys = [ $globalKeys ];
 760                 }
 761
 762                 foreach ( $globalKeys as $globalKey ) {
 763                         // NOTE: make sure we only save the global once or a second call to
 764                         // setMwGlobals() on the same global would override the original
 765                         // value.
 766                         if (
 767                                 !array_key_exists( $globalKey, $this->mwGlobals ) &&
 768                                 !array_key_exists( $globalKey, $this->mwGlobalsToUnset )
 769                         ) {
 770                                 if ( !array_key_exists( $globalKey, $GLOBALS ) ) {
 771                                         $this->mwGlobalsToUnset[$globalKey] = $globalKey;
 772                                         continue;
 773                                 }
 774                                 // NOTE: we serialize then unserialize the value in case it is an object
 775                                 // this stops any objects being passed by reference. We could use clone
 776                                 // and if is_object but this does account for objects within objects!
 777                                 if ( self::canShallowCopy( $GLOBALS[$globalKey] ) ) {
 778                                         $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 779                                 } elseif (
 780                                         // Many MediaWiki types are safe to clone. These are the
 781                                         // ones that are most commonly stashed.
 782                                         $GLOBALS[$globalKey] instanceof Language ||
 783                                         $GLOBALS[$globalKey] instanceof User ||
 784                                         $GLOBALS[$globalKey] instanceof FauxRequest
 785                                 ) {
 786                                         $this->mwGlobals[$globalKey] = clone $GLOBALS[$globalKey];
 787                                 } elseif ( $this->containsClosure( $GLOBALS[$globalKey] ) ) {
 788                                         // Serializing Closure only gives a warning on HHVM while
 789                                         // it throws an Exception on Zend.
 790                                         // Workaround for https://github.com/facebook/hhvm/issues/6206
 791                                         $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 792                                 } else {
 793                                         try {
 794                                                 $this->mwGlobals[$globalKey] = unserialize( serialize( $GLOBALS[$globalKey] ) );
 795                                         } catch ( Exception $e ) {
 796                                                 $this->mwGlobals[$globalKey] = $GLOBALS[$globalKey];
 797                                         }
 798                                 }
 799                         }
 800                 }
 801         }
 802
 803         /**
 804          * @param mixed $var
 805          * @param int $maxDepth
 806          *
 807          * @return bool
 808          */
 809         private function containsClosure( $var, $maxDepth = 15 ) {
 810                 if ( $var instanceof Closure ) {
 811                         return true;
 812                 }
 813                 if ( !is_array( $var ) || $maxDepth === 0 ) {
 814                         return false;
 815                 }
 816
 817                 foreach ( $var as $value ) {
 818                         if ( $this->containsClosure( $value, $maxDepth - 1 ) ) {
 819                                 return true;
 820                         }
 821                 }
 822                 return false;
 823         }
 824
 825         /**
 826          * Merges the given values into a MW global array variable.
 827          * Useful for setting some entries in a configuration array, instead of
 828          * setting the entire array.
 829          *
 830          * @param string $name The name of the global, as in wgFooBar
 831          * @param array $values The array containing the entries to set in that global
 832          *
 833          * @throws MWException If the designated global is not an array.
 834          *
 835          * @note To allow changes to global variables to take effect on global service instances,
 836          *       call overrideMwServices().
 837          *
 838          * @since 1.21
 839          */
 840         protected function mergeMwGlobalArrayValue( $name, $values ) {
 841                 if ( !isset( $GLOBALS[$name] ) ) {
 842                         $merged = $values;
 843                 } else {
 844                         if ( !is_array( $GLOBALS[$name] ) ) {
 845                                 throw new MWException( "MW global $name is not an array." );
 846                         }
 847
 848                         // NOTE: do not use array_merge, it screws up for numeric keys.
 849                         $merged = $GLOBALS[$name];
 850                         foreach ( $values as $k => $v ) {
 851                                 $merged[$k] = $v;
 852                         }
 853                 }
 854
 855                 $this->setMwGlobals( $name, $merged );
 856         }
 857
 858         /**
 859          * Stashes the global instance of MediaWikiServices, and installs a new one,
 860          * allowing test cases to override settings and services.
 861          * The previous instance of MediaWikiServices will be restored on tearDown.
 862          *
 863          * @since 1.27
 864          *
 865          * @param Config|null $configOverrides Configuration overrides for the new MediaWikiServices
 866          *        instance.
 867          * @param callable[] $services An associative array of services to re-define. Keys are service
 868          *        names, values are callables.
 869          *
 870          * @return MediaWikiServices
 871          * @throws MWException
 872          */
 873         protected function overrideMwServices(
 874                 Config $configOverrides = null, array $services = []
 875         ) {
 876                 $newInstance = self::installMockMwServices( $configOverrides );
 877
 878                 if ( $this->localServices ) {
 879                         $this->localServices->destroy();
 880                 }
 881
 882                 $this->localServices = $newInstance;
 883
 884                 foreach ( $services as $name => $callback ) {
 885                         $newInstance->redefineService( $name, $callback );
 886                 }
 887
 888                 return $newInstance;
 889         }
 890
 891         /**
 892          * Creates a new "mock" MediaWikiServices instance, and installs it.
 893          * This effectively resets all cached states in services, with the exception of
 894          * the ConfigFactory and the DBLoadBalancerFactory service, which are inherited from
 895          * the original MediaWikiServices.
 896          *
 897          * @note The new original MediaWikiServices instance can later be restored by calling
 898          * restoreMwServices(). That original is determined by the first call to this method, or
 899          * by setUpBeforeClass, whichever is called first. The caller is responsible for managing
 900          * and, when appropriate, destroying any other MediaWikiServices instances that may get
 901          * replaced when calling this method.
 902          *
 903          * @param Config|null $configOverrides Configuration overrides for the new MediaWikiServices
 904          *        instance.
 905          *
 906          * @return MediaWikiServices the new mock service locator.
 907          */
 908         public static function installMockMwServices( Config $configOverrides = null ) {
 909                 // Make sure we have the original service locator
 910                 if ( !self::$originalServices ) {
 911                         self::$originalServices = MediaWikiServices::getInstance();
 912                 }
 913
 914                 if ( !$configOverrides ) {
 915                         $configOverrides = new HashConfig();
 916                 }
 917
 918                 $oldConfigFactory = self::$originalServices->getConfigFactory();
 919                 $oldLoadBalancerFactory = self::$originalServices->getDBLoadBalancerFactory();
 920
 921                 $testConfig = self::makeTestConfig( null, $configOverrides );
 922                 $newServices = new MediaWikiServices( $testConfig );
 923
 924                 // Load the default wiring from the specified files.
 925                 // NOTE: this logic mirrors the logic in MediaWikiServices::newInstance.
 926                 $wiringFiles = $testConfig->get( 'ServiceWiringFiles' );
 927                 $newServices->loadWiringFiles( $wiringFiles );
 928
 929                 // Provide a traditional hook point to allow extensions to configure services.
 930                 Hooks::run( 'MediaWikiServices', [ $newServices ] );
 931
 932                 // Use bootstrap config for all configuration.
 933                 // This allows config overrides via global variables to take effect.
 934                 $bootstrapConfig = $newServices->getBootstrapConfig();
 935                 $newServices->resetServiceForTesting( 'ConfigFactory' );
 936                 $newServices->redefineService(
 937                         'ConfigFactory',
 938                         self::makeTestConfigFactoryInstantiator(
 939                                 $oldConfigFactory,
 940                                 [ 'main' => $bootstrapConfig ]
 941                         )
 942                 );
 943                 $newServices->resetServiceForTesting( 'DBLoadBalancerFactory' );
 944                 $newServices->redefineService(
 945                         'DBLoadBalancerFactory',
 946                         function ( MediaWikiServices $services ) use ( $oldLoadBalancerFactory ) {
 947                                 return $oldLoadBalancerFactory;
 948                         }
 949                 );
 950
 951                 MediaWikiServices::forceGlobalInstance( $newServices );
 952                 return $newServices;
 953         }
 954
 955         /**
 956          * Restores the original, non-mock MediaWikiServices instance.
 957          * The previously active MediaWikiServices instance is destroyed,
 958          * if it is different from the original that is to be restored.
 959          *
 960          * @note this if for internal use by test framework code. It should never be
 961          * called from inside a test case, a data provider, or a setUp or tearDown method.
 962          *
 963          * @return bool true if the original service locator was restored,
 964          *         false if there was nothing  too do.
 965          */
 966         public static function restoreMwServices() {
 967                 if ( !self::$originalServices ) {
 968                         return false;
 969                 }
 970
 971                 $currentServices = MediaWikiServices::getInstance();
 972
 973                 if ( self::$originalServices === $currentServices ) {
 974                         return false;
 975                 }
 976
 977                 MediaWikiServices::forceGlobalInstance( self::$originalServices );
 978                 $currentServices->destroy();
 979
 980                 return true;
 981         }
 982
 983         /**
 984          * @since 1.27
 985          * @param string|Language $lang
 986          */
 987         public function setUserLang( $lang ) {
 988                 RequestContext::getMain()->setLanguage( $lang );
 989                 $this->setMwGlobals( 'wgLang', RequestContext::getMain()->getLanguage() );
 990         }
 991
 992         /**
 993          * @since 1.27
 994          * @param string|Language $lang
 995          */
 996         public function setContentLang( $lang ) {
 997                 if ( $lang instanceof Language ) {
 998                         $langCode = $lang->getCode();
 999                         $langObj = $lang;
1000                 } else {
1001                         $langCode = $lang;
1002                         $langObj = Language::factory( $langCode );
1003                 }
1004                 $this->setMwGlobals( 'wgLanguageCode', $langCode );
1005                 $this->setService( 'ContentLanguage', $langObj );
1006         }
1007
1008         /**
1009          * Alters $wgGroupPermissions for the duration of the test.  Can be called
1010          * with an array, like
1011          *   [ '*' => [ 'read' => false ], 'user' => [ 'read' => false ] ]
1012          * or three values to set a single permission, like
1013          *   $this->setGroupPermissions( '*', 'read', false );
1014          *
1015          * @since 1.31
1016          * @param array|string $newPerms Either an array of permissions to change,
1017          *   in which case the next two parameters are ignored; or a single string
1018          *   identifying a group, to use with the next two parameters.
1019          * @param string|null $newKey
1020          * @param mixed|null $newValue
1021          */
1022         public function setGroupPermissions( $newPerms, $newKey = null, $newValue = null ) {
1023                 global $wgGroupPermissions;
1024
1025                 $this->stashMwGlobals( 'wgGroupPermissions' );
1026
1027                 if ( is_string( $newPerms ) ) {
1028                         $newPerms = [ $newPerms => [ $newKey => $newValue ] ];
1029                 }
1030
1031                 foreach ( $newPerms as $group => $permissions ) {
1032                         foreach ( $permissions as $key => $value ) {
1033                                 $wgGroupPermissions[$group][$key] = $value;
1034                         }
1035                 }
1036         }
1037
1038         /**
1039          * Sets the logger for a specified channel, for the duration of the test.
1040          * @since 1.27
1041          * @param string $channel
1042          * @param LoggerInterface $logger
1043          */
1044         protected function setLogger( $channel, LoggerInterface $logger ) {
1045                 // TODO: Once loggers are managed by MediaWikiServices, use
1046                 //       overrideMwServices() to set loggers.
1047
1048                 $provider = LoggerFactory::getProvider();
1049                 $wrappedProvider = TestingAccessWrapper::newFromObject( $provider );
1050                 $singletons = $wrappedProvider->singletons;
1051                 if ( $provider instanceof MonologSpi ) {
1052                         if ( !isset( $this->loggers[$channel] ) ) {
1053                                 $this->loggers[$channel] = $singletons['loggers'][$channel] ?? null;
1054                         }
1055                         $singletons['loggers'][$channel] = $logger;
1056                 } elseif ( $provider instanceof LegacySpi ) {
1057                         if ( !isset( $this->loggers[$channel] ) ) {
1058                                 $this->loggers[$channel] = $singletons[$channel] ?? null;
1059                         }
1060                         $singletons[$channel] = $logger;
1061                 } else {
1062                         throw new LogicException( __METHOD__ . ': setting a logger for ' . get_class( $provider )
1063                                 . ' is not implemented' );
1064                 }
1065                 $wrappedProvider->singletons = $singletons;
1066         }
1067
1068         /**
1069          * Restores loggers replaced by setLogger().
1070          * @since 1.27
1071          */
1072         private function restoreLoggers() {
1073                 $provider = LoggerFactory::getProvider();
1074                 $wrappedProvider = TestingAccessWrapper::newFromObject( $provider );
1075                 $singletons = $wrappedProvider->singletons;
1076                 foreach ( $this->loggers as $channel => $logger ) {
1077                         if ( $provider instanceof MonologSpi ) {
1078                                 if ( $logger === null ) {
1079                                         unset( $singletons['loggers'][$channel] );
1080                                 } else {
1081                                         $singletons['loggers'][$channel] = $logger;
1082                                 }
1083                         } elseif ( $provider instanceof LegacySpi ) {
1084                                 if ( $logger === null ) {
1085                                         unset( $singletons[$channel] );
1086                                 } else {
1087                                         $singletons[$channel] = $logger;
1088                                 }
1089                         }
1090                 }
1091                 $wrappedProvider->singletons = $singletons;
1092                 $this->loggers = [];
1093         }
1094
1095         /**
1096          * @return string
1097          * @since 1.18
1098          */
1099         public function dbPrefix() {
1100                 return self::getTestPrefixFor( $this->db );
1101         }
1102
1103         /**
1104          * @param IDatabase $db
1105          * @return string
1106          * @since 1.32
1107          */
1108         public static function getTestPrefixFor( IDatabase $db ) {
1109                 return $db->getType() == 'oracle' ? self::ORA_DB_PREFIX : self::DB_PREFIX;
1110         }
1111
1112         /**
1113          * @return bool
1114          * @since 1.18
1115          */
1116         public function needsDB() {
1117                 // If the test says it uses database tables, it needs the database
1118                 return $this->tablesUsed || $this->isTestInDatabaseGroup();
1119         }
1120
1121         /**
1122          * @return bool
1123          * @since 1.32
1124          */
1125         protected function isTestInDatabaseGroup() {
1126                 // If the test class says it belongs to the Database group, it needs the database.
1127                 // NOTE: This ONLY checks for the group in the class level doc comment.
1128                 $rc = new ReflectionClass( $this );
1129                 return (bool)preg_match( '/@group +Database/im', $rc->getDocComment() );
1130         }
1131
1132         /**
1133          * Insert a new page.
1134          *
1135          * Should be called from addDBData().
1136          *
1137          * @since 1.25 ($namespace in 1.28)
1138          * @param string|Title $pageName Page name or title
1139          * @param string $text Page's content
1140          * @param int|null $namespace Namespace id (name cannot already contain namespace)
1141          * @param User|null $user If null, static::getTestSysop()->getUser() is used.
1142          * @return array Title object and page id
1143          */
1144         protected function insertPage(
1145                 $pageName,
1146                 $text = 'Sample page for unit test.',
1147                 $namespace = null,
1148                 User $user = null
1149         ) {
1150                 if ( is_string( $pageName ) ) {
1151                         $title = Title::newFromText( $pageName, $namespace );
1152                 } else {
1153                         $title = $pageName;
1154                 }
1155
1156                 if ( !$user ) {
1157                         $user = static::getTestSysop()->getUser();
1158                 }
1159                 $comment = __METHOD__ . ': Sample page for unit test.';
1160
1161                 $page = WikiPage::factory( $title );
1162                 $page->doEditContent( ContentHandler::makeContent( $text, $title ), $comment, 0, false, $user );
1163
1164                 return [
1165                         'title' => $title,
1166                         'id' => $page->getId(),
1167                 ];
1168         }
1169
1170         /**
1171          * Stub. If a test suite needs to add additional data to the database, it should
1172          * implement this method and do so. This method is called once per test suite
1173          * (i.e. once per class).
1174          *
1175          * Note data added by this method may be removed by resetDB() depending on
1176          * the contents of $tablesUsed.
1177          *
1178          * To add additional data between test function runs, override prepareDB().
1179          *
1180          * @see addDBData()
1181          * @see resetDB()
1182          *
1183          * @since 1.27
1184          */
1185         public function addDBDataOnce() {
1186         }
1187
1188         /**
1189          * Stub. Subclasses may override this to prepare the database.
1190          * Called before every test run (test function or data set).
1191          *
1192          * @see addDBDataOnce()
1193          * @see resetDB()
1194          *
1195          * @since 1.18
1196          */
1197         public function addDBData() {
1198         }
1199
1200         /**
1201          * @since 1.32
1202          */
1203         protected function addCoreDBData() {
1204                 if ( $this->db->getType() == 'oracle' ) {
1205                         # Insert 0 user to prevent FK violations
1206                         # Anonymous user
1207                         if ( !$this->db->selectField( 'user', '1', [ 'user_id' => 0 ] ) ) {
1208                                 $this->db->insert( 'user', [
1209                                         'user_id' => 0,
1210                                         'user_name' => 'Anonymous' ], __METHOD__, [ 'IGNORE' ] );
1211                         }
1212
1213                         # Insert 0 page to prevent FK violations
1214                         # Blank page
1215                         if ( !$this->db->selectField( 'page', '1', [ 'page_id' => 0 ] ) ) {
1216                                 $this->db->insert( 'page', [
1217                                         'page_id' => 0,
1218                                         'page_namespace' => 0,
1219                                         'page_title' => ' ',
1220                                         'page_restrictions' => null,
1221                                         'page_is_redirect' => 0,
1222                                         'page_is_new' => 0,
1223                                         'page_random' => 0,
1224                                         'page_touched' => $this->db->timestamp(),
1225                                         'page_latest' => 0,
1226                                         'page_len' => 0 ], __METHOD__, [ 'IGNORE' ] );
1227                         }
1228                 }
1229
1230                 SiteStatsInit::doPlaceholderInit();
1231
1232                 User::resetIdByNameCache();
1233
1234                 // Make sysop user
1235                 $user = static::getTestSysop()->getUser();
1236
1237                 // Make 1 page with 1 revision
1238                 $page = WikiPage::factory( Title::newFromText( 'UTPage' ) );
1239                 if ( $page->getId() == 0 ) {
1240                         $page->doEditContent(
1241                                 new WikitextContent( 'UTContent' ),
1242                                 'UTPageSummary',
1243                                 EDIT_NEW | EDIT_SUPPRESS_RC,
1244                                 false,
1245                                 $user
1246                         );
1247                         // an edit always attempt to purge backlink links such as history
1248                         // pages. That is unnecessary.
1249                         JobQueueGroup::singleton()->get( 'htmlCacheUpdate' )->delete();
1250                         // WikiPages::doEditUpdates randomly adds RC purges
1251                         JobQueueGroup::singleton()->get( 'recentChangesUpdate' )->delete();
1252
1253                         // doEditContent() probably started the session via
1254                         // User::loadFromSession(). Close it now.
1255                         if ( session_id() !== '' ) {
1256                                 session_write_close();
1257                                 session_id( '' );
1258                         }
1259                 }
1260         }
1261
1262         /**
1263          * Restores MediaWiki to using the table set (table prefix) it was using before
1264          * setupTestDB() was called. Useful if we need to perform database operations
1265          * after the test run has finished (such as saving logs or profiling info).
1266          *
1267          * This is called by phpunit/bootstrap.php after the last test.
1268          *
1269          * @since 1.21
1270          */
1271         public static function teardownTestDB() {
1272                 global $wgJobClasses;
1273
1274                 if ( !self::$dbSetup ) {
1275                         return;
1276                 }
1277
1278                 Hooks::run( 'UnitTestsBeforeDatabaseTeardown' );
1279
1280                 foreach ( $wgJobClasses as $type => $class ) {
1281                         // Delete any jobs under the clone DB (or old prefix in other stores)
1282                         JobQueueGroup::singleton()->get( $type )->delete();
1283                 }
1284
1285                 CloneDatabase::changePrefix( self::$oldTablePrefix );
1286
1287                 self::$oldTablePrefix = false;
1288                 self::$dbSetup = false;
1289         }
1290
1291         /**
1292          * Setups a database with cloned tables using the given prefix.
1293          *
1294          * If reuseDB is true and certain conditions apply, it will just change the prefix.
1295          * Otherwise, it will clone the tables and change the prefix.
1296          *
1297          * @param IMaintainableDatabase $db Database to use
1298          * @param string|null $prefix Prefix to use for test tables. If not given, the prefix is determined
1299          *        automatically for $db.
1300          * @return bool True if tables were cloned, false if only the prefix was changed
1301          */
1302         protected static function setupDatabaseWithTestPrefix(
1303                 IMaintainableDatabase $db,
1304                 $prefix = null
1305         ) {
1306                 if ( $prefix === null ) {
1307                         $prefix = self::getTestPrefixFor( $db );
1308                 }
1309
1310                 if ( ( $db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
1311                         $db->tablePrefix( $prefix );
1312                         return false;
1313                 }
1314
1315                 if ( !isset( $db->_originalTablePrefix ) ) {
1316                         $oldPrefix = $db->tablePrefix();
1317
1318                         if ( $oldPrefix === $prefix ) {
1319                                 // table already has the correct prefix, but presumably no cloned tables
1320                                 $oldPrefix = self::$oldTablePrefix;
1321                         }
1322
1323                         $db->tablePrefix( $oldPrefix );
1324                         $tablesCloned = self::listTables( $db );
1325                         $dbClone = new CloneDatabase( $db, $tablesCloned, $prefix, $oldPrefix );
1326                         $dbClone->useTemporaryTables( self::$useTemporaryTables );
1327
1328                         $dbClone->cloneTableStructure();
1329
1330                         $db->tablePrefix( $prefix );
1331                         $db->_originalTablePrefix = $oldPrefix;
1332                 }
1333
1334                 return true;
1335         }
1336
1337         /**
1338          * Set up all test DBs
1339          */
1340         public function setupAllTestDBs() {
1341                 global $wgDBprefix;
1342
1343                 self::$oldTablePrefix = $wgDBprefix;
1344
1345                 $testPrefix = $this->dbPrefix();
1346
1347                 // switch to a temporary clone of the database
1348                 self::setupTestDB( $this->db, $testPrefix );
1349
1350                 if ( self::isUsingExternalStoreDB() ) {
1351                         self::setupExternalStoreTestDBs( $testPrefix );
1352                 }
1353
1354                 // NOTE: Change the prefix in the LBFactory and $wgDBprefix, to prevent
1355                 // *any* database connections to operate on live data.
1356                 CloneDatabase::changePrefix( $testPrefix );
1357         }
1358
1359         /**
1360          * Creates an empty skeleton of the wiki database by cloning its structure
1361          * to equivalent tables using the given $prefix. Then sets MediaWiki to
1362          * use the new set of tables (aka schema) instead of the original set.
1363          *
1364          * This is used to generate a dummy table set, typically consisting of temporary
1365          * tables, that will be used by tests instead of the original wiki database tables.
1366          *
1367          * @since 1.21
1368          *
1369          * @note the original table prefix is stored in self::$oldTablePrefix. This is used
1370          * by teardownTestDB() to return the wiki to using the original table set.
1371          *
1372          * @note this method only works when first called. Subsequent calls have no effect,
1373          * even if using different parameters.
1374          *
1375          * @param Database $db The database connection
1376          * @param string $prefix The prefix to use for the new table set (aka schema).
1377          *
1378          * @throws MWException If the database table prefix is already $prefix
1379          */
1380         public static function setupTestDB( Database $db, $prefix ) {
1381                 if ( self::$dbSetup ) {
1382                         return;
1383                 }
1384
1385                 if ( $db->tablePrefix() === $prefix ) {
1386                         throw new MWException(
1387                                 'Cannot run unit tests, the database prefix is already "' . $prefix . '"' );
1388                 }
1389
1390                 // TODO: the below should be re-written as soon as LBFactory, LoadBalancer,
1391                 // and Database no longer use global state.
1392
1393                 self::$dbSetup = true;
1394
1395                 if ( !self::setupDatabaseWithTestPrefix( $db, $prefix ) ) {
1396                         return;
1397                 }
1398
1399                 // Assuming this isn't needed for External Store database, and not sure if the procedure
1400                 // would be available there.
1401                 if ( $db->getType() == 'oracle' ) {
1402                         $db->query( 'BEGIN FILL_WIKI_INFO; END;', __METHOD__ );
1403                 }
1404
1405                 Hooks::run( 'UnitTestsAfterDatabaseSetup', [ $db, $prefix ] );
1406         }
1407
1408         /**
1409          * Clones the External Store database(s) for testing
1410          *
1411          * @param string|null $testPrefix Prefix for test tables. Will be determined automatically
1412          *        if not given.
1413          */
1414         protected static function setupExternalStoreTestDBs( $testPrefix = null ) {
1415                 $connections = self::getExternalStoreDatabaseConnections();
1416                 foreach ( $connections as $dbw ) {
1417                         self::setupDatabaseWithTestPrefix( $dbw, $testPrefix );
1418                 }
1419         }
1420
1421         /**
1422          * Gets master database connections for all of the ExternalStoreDB
1423          * stores configured in $wgDefaultExternalStore.
1424          *
1425          * @return Database[] Array of Database master connections
1426          */
1427         protected static function getExternalStoreDatabaseConnections() {
1428                 global $wgDefaultExternalStore;
1429
1430                 /** @var ExternalStoreDB $externalStoreDB */
1431                 $externalStoreDB = ExternalStore::getStoreObject( 'DB' );
1432                 $defaultArray = (array)$wgDefaultExternalStore;
1433                 $dbws = [];
1434                 foreach ( $defaultArray as $url ) {
1435                         if ( strpos( $url, 'DB://' ) === 0 ) {
1436                                 list( $proto, $cluster ) = explode( '://', $url, 2 );
1437                                 // Avoid getMaster() because setupDatabaseWithTestPrefix()
1438                                 // requires Database instead of plain DBConnRef/IDatabase
1439                                 $dbws[] = $externalStoreDB->getMaster( $cluster );
1440                         }
1441                 }
1442
1443                 return $dbws;
1444         }
1445
1446         /**
1447          * Check whether ExternalStoreDB is being used
1448          *
1449          * @return bool True if it's being used
1450          */
1451         protected static function isUsingExternalStoreDB() {
1452                 global $wgDefaultExternalStore;
1453                 if ( !$wgDefaultExternalStore ) {
1454                         return false;
1455                 }
1456
1457                 $defaultArray = (array)$wgDefaultExternalStore;
1458                 foreach ( $defaultArray as $url ) {
1459                         if ( strpos( $url, 'DB://' ) === 0 ) {
1460                                 return true;
1461                         }
1462                 }
1463
1464                 return false;
1465         }
1466
1467         /**
1468          * @throws LogicException if the given database connection is not a set up to use
1469          * mock tables.
1470          *
1471          * @since 1.31 this is no longer private.
1472          */
1473         protected function ensureMockDatabaseConnection( IDatabase $db ) {
1474                 if ( $db->tablePrefix() !== $this->dbPrefix() ) {
1475                         throw new LogicException(
1476                                 'Trying to delete mock tables, but table prefix does not indicate a mock database.'
1477                         );
1478                 }
1479         }
1480
1481         private static $schemaOverrideDefaults = [
1482                 'scripts' => [],
1483                 'create' => [],
1484                 'drop' => [],
1485                 'alter' => [],
1486         ];
1487
1488         /**
1489          * Stub. If a test suite needs to test against a specific database schema, it should
1490          * override this method and return the appropriate information from it.
1491          *
1492          * @param IMaintainableDatabase $db The DB connection to use for the mock schema.
1493          *        May be used to check the current state of the schema, to determine what
1494          *        overrides are needed.
1495          *
1496          * @return array An associative array with the following fields:
1497          *  - 'scripts': any SQL scripts to run. If empty or not present, schema overrides are skipped.
1498          * - 'create': A list of tables created (may or may not exist in the original schema).
1499          * - 'drop': A list of tables dropped (expected to be present in the original schema).
1500          * - 'alter': A list of tables altered (expected to be present in the original schema).
1501          */
1502         protected function getSchemaOverrides( IMaintainableDatabase $db ) {
1503                 return [];
1504         }
1505
1506         /**
1507          * Undoes the specified schema overrides..
1508          * Called once per test class, just before addDataOnce().
1509          *
1510          * @param IMaintainableDatabase $db
1511          * @param array $oldOverrides
1512          */
1513         private function undoSchemaOverrides( IMaintainableDatabase $db, $oldOverrides ) {
1514                 $this->ensureMockDatabaseConnection( $db );
1515
1516                 $oldOverrides = $oldOverrides + self::$schemaOverrideDefaults;
1517                 $originalTables = $this->listOriginalTables( $db, 'unprefixed' );
1518
1519                 // Drop tables that need to be restored or removed.
1520                 $tablesToDrop = array_merge( $oldOverrides['create'], $oldOverrides['alter'] );
1521
1522                 // Restore tables that have been dropped or created or altered,
1523                 // if they exist in the original schema.
1524                 $tablesToRestore = array_merge( $tablesToDrop, $oldOverrides['drop'] );
1525                 $tablesToRestore = array_intersect( $originalTables, $tablesToRestore );
1526
1527                 if ( $tablesToDrop ) {
1528                         $this->dropMockTables( $db, $tablesToDrop );
1529                 }
1530
1531                 if ( $tablesToRestore ) {
1532                         $this->recloneMockTables( $db, $tablesToRestore );
1533                 }
1534         }
1535
1536         /**
1537          * Applies the schema overrides returned by getSchemaOverrides(),
1538          * after undoing any previously applied schema overrides.
1539          * Called once per test class, just before addDataOnce().
1540          */
1541         private function setUpSchema( IMaintainableDatabase $db ) {
1542                 // Undo any active overrides.
1543                 $oldOverrides = $db->_schemaOverrides ?? self::$schemaOverrideDefaults;
1544
1545                 if ( $oldOverrides['alter'] || $oldOverrides['create'] || $oldOverrides['drop'] ) {
1546                         $this->undoSchemaOverrides( $db, $oldOverrides );
1547                 }
1548
1549                 // Determine new overrides.
1550                 $overrides = $this->getSchemaOverrides( $db ) + self::$schemaOverrideDefaults;
1551
1552                 $extraKeys = array_diff(
1553                         array_keys( $overrides ),
1554                         array_keys( self::$schemaOverrideDefaults )
1555                 );
1556
1557                 if ( $extraKeys ) {
1558                         throw new InvalidArgumentException(
1559                                 'Schema override contains extra keys: ' . var_export( $extraKeys, true )
1560                         );
1561                 }
1562
1563                 if ( !$overrides['scripts'] ) {
1564                         // no scripts to run
1565                         return;
1566                 }
1567
1568                 if ( !$overrides['create'] && !$overrides['drop'] && !$overrides['alter'] ) {
1569                         throw new InvalidArgumentException(
1570                                 'Schema override scripts given, but no tables are declared to be '
1571                                 . 'created, dropped or altered.'
1572                         );
1573                 }
1574
1575                 $this->ensureMockDatabaseConnection( $db );
1576
1577                 // Drop the tables that will be created by the schema scripts.
1578                 $originalTables = $this->listOriginalTables( $db, 'unprefixed' );
1579                 $tablesToDrop = array_intersect( $originalTables, $overrides['create'] );
1580
1581                 if ( $tablesToDrop ) {
1582                         $this->dropMockTables( $db, $tablesToDrop );
1583                 }
1584
1585                 // Run schema override scripts.
1586                 foreach ( $overrides['scripts'] as $script ) {
1587                         $db->sourceFile(
1588                                 $script,
1589                                 null,
1590                                 null,
1591                                 __METHOD__,
1592                                 function ( $cmd ) {
1593                                         return $this->mungeSchemaUpdateQuery( $cmd );
1594                                 }
1595                         );
1596                 }
1597
1598                 $db->_schemaOverrides = $overrides;
1599         }
1600
1601         private function mungeSchemaUpdateQuery( $cmd ) {
1602                 return self::$useTemporaryTables
1603                         ? preg_replace( '/\bCREATE\s+TABLE\b/i', 'CREATE TEMPORARY TABLE', $cmd )
1604                         : $cmd;
1605         }
1606
1607         /**
1608          * Drops the given mock tables.
1609          *
1610          * @param IMaintainableDatabase $db
1611          * @param array $tables
1612          */
1613         private function dropMockTables( IMaintainableDatabase $db, array $tables ) {
1614                 $this->ensureMockDatabaseConnection( $db );
1615
1616                 foreach ( $tables as $tbl ) {
1617                         $tbl = $db->tableName( $tbl );
1618                         $db->query( "DROP TABLE IF EXISTS $tbl", __METHOD__ );
1619                 }
1620         }
1621
1622         /**
1623          * Lists all tables in the live database schema.
1624          *
1625          * @param IMaintainableDatabase $db
1626          * @param string $prefix Either 'prefixed' or 'unprefixed'
1627          * @return array
1628          */
1629         private function listOriginalTables( IMaintainableDatabase $db, $prefix = 'prefixed' ) {
1630                 if ( !isset( $db->_originalTablePrefix ) ) {
1631                         throw new LogicException( 'No original table prefix know, cannot list tables!' );
1632                 }
1633
1634                 $originalTables = $db->listTables( $db->_originalTablePrefix, __METHOD__ );
1635                 if ( $prefix === 'unprefixed' ) {
1636                         $originalPrefixRegex = '/^' . preg_quote( $db->_originalTablePrefix, '/' ) . '/';
1637                         $originalTables = array_map(
1638                                 function ( $pt ) use ( $originalPrefixRegex ) {
1639                                         return preg_replace( $originalPrefixRegex, '', $pt );
1640                                 },
1641                                 $originalTables
1642                         );
1643                 }
1644
1645                 return $originalTables;
1646         }
1647
1648         /**
1649          * Re-clones the given mock tables to restore them based on the live database schema.
1650          * The tables listed in $tables are expected to currently not exist, so dropMockTables()
1651          * should be called first.
1652          *
1653          * @param IMaintainableDatabase $db
1654          * @param array $tables
1655          */
1656         private function recloneMockTables( IMaintainableDatabase $db, array $tables ) {
1657                 $this->ensureMockDatabaseConnection( $db );
1658
1659                 if ( !isset( $db->_originalTablePrefix ) ) {
1660                         throw new LogicException( 'No original table prefix know, cannot restore tables!' );
1661                 }
1662
1663                 $originalTables = $this->listOriginalTables( $db, 'unprefixed' );
1664                 $tables = array_intersect( $tables, $originalTables );
1665
1666                 $dbClone = new CloneDatabase( $db, $tables, $db->tablePrefix(), $db->_originalTablePrefix );
1667                 $dbClone->useTemporaryTables( self::$useTemporaryTables );
1668
1669                 $dbClone->cloneTableStructure();
1670         }
1671
1672         /**
1673          * Empty all tables so they can be repopulated for tests
1674          *
1675          * @param Database $db|null Database to reset
1676          * @param array $tablesUsed Tables to reset
1677          */
1678         private function resetDB( $db, $tablesUsed ) {
1679                 if ( $db ) {
1680                         $userTables = [ 'user', 'user_groups', 'user_properties', 'actor' ];
1681                         $pageTables = [
1682                                 'page', 'revision', 'ip_changes', 'revision_comment_temp', 'comment', 'archive',
1683                                 'revision_actor_temp', 'slots', 'content', 'content_models', 'slot_roles',
1684                         ];
1685                         $coreDBDataTables = array_merge( $userTables, $pageTables );
1686
1687                         // If any of the user or page tables were marked as used, we should clear all of them.
1688                         if ( array_intersect( $tablesUsed, $userTables ) ) {
1689                                 $tablesUsed = array_unique( array_merge( $tablesUsed, $userTables ) );
1690                                 TestUserRegistry::clear();
1691                         }
1692                         if ( array_intersect( $tablesUsed, $pageTables ) ) {
1693                                 $tablesUsed = array_unique( array_merge( $tablesUsed, $pageTables ) );
1694                         }
1695
1696                         // Postgres, Oracle, and MSSQL all use mwuser/pagecontent
1697                         // instead of user/text. But Postgres does not remap the
1698                         // table name in tableExists(), so we mark the real table
1699                         // names as being used.
1700                         if ( $db->getType() === 'postgres' ) {
1701                                 if ( in_array( 'user', $tablesUsed ) ) {
1702                                         $tablesUsed[] = 'mwuser';
1703                                 }
1704                                 if ( in_array( 'text', $tablesUsed ) ) {
1705                                         $tablesUsed[] = 'pagecontent';
1706                                 }
1707                         }
1708
1709                         foreach ( $tablesUsed as $tbl ) {
1710                                 $this->truncateTable( $tbl, $db );
1711                         }
1712
1713                         if ( array_intersect( $tablesUsed, $coreDBDataTables ) ) {
1714                                 // Reset services that may contain information relating to the truncated tables
1715                                 $this->overrideMwServices();
1716                                 // Re-add core DB data that was deleted
1717                                 $this->addCoreDBData();
1718                         }
1719                 }
1720         }
1721
1722         /**
1723          * Empties the given table and resets any auto-increment counters.
1724          * Will also purge caches associated with some well known tables.
1725          * If the table is not know, this method just returns.
1726          *
1727          * @param string $tableName
1728          * @param IDatabase|null $db
1729          */
1730         protected function truncateTable( $tableName, IDatabase $db = null ) {
1731                 if ( !$db ) {
1732                         $db = $this->db;
1733                 }
1734
1735                 if ( !$db->tableExists( $tableName ) ) {
1736                         return;
1737                 }
1738
1739                 $truncate = in_array( $db->getType(), [ 'oracle', 'mysql' ] );
1740
1741                 if ( $truncate ) {
1742                         $db->query( 'TRUNCATE TABLE ' . $db->tableName( $tableName ), __METHOD__ );
1743                 } else {
1744                         $db->delete( $tableName, '*', __METHOD__ );
1745                 }
1746
1747                 if ( $db instanceof DatabasePostgres || $db instanceof DatabaseSqlite ) {
1748                         // Reset the table's sequence too.
1749                         $db->resetSequenceForTable( $tableName, __METHOD__ );
1750                 }
1751
1752                 // re-initialize site_stats table
1753                 if ( $tableName === 'site_stats' ) {
1754                         SiteStatsInit::doPlaceholderInit();
1755                 }
1756         }
1757
1758         private static function unprefixTable( &$tableName, $ind, $prefix ) {
1759                 $tableName = substr( $tableName, strlen( $prefix ) );
1760         }
1761
1762         private static function isNotUnittest( $table ) {
1763                 return strpos( $table, self::DB_PREFIX ) !== 0;
1764         }
1765
1766         /**
1767          * @since 1.18
1768          *
1769          * @param IMaintainableDatabase $db
1770          *
1771          * @return array
1772          */
1773         public static function listTables( IMaintainableDatabase $db ) {
1774                 $prefix = $db->tablePrefix();
1775                 $tables = $db->listTables( $prefix, __METHOD__ );
1776
1777                 if ( $db->getType() === 'mysql' ) {
1778                         static $viewListCache = null;
1779                         if ( $viewListCache === null ) {
1780                                 $viewListCache = $db->listViews( null, __METHOD__ );
1781                         }
1782                         // T45571: cannot clone VIEWs under MySQL
1783                         $tables = array_diff( $tables, $viewListCache );
1784                 }
1785                 array_walk( $tables, [ __CLASS__, 'unprefixTable' ], $prefix );
1786
1787                 // Don't duplicate test tables from the previous fataled run
1788                 $tables = array_filter( $tables, [ __CLASS__, 'isNotUnittest' ] );
1789
1790                 if ( $db->getType() == 'sqlite' ) {
1791                         $tables = array_flip( $tables );
1792                         // these are subtables of searchindex and don't need to be duped/dropped separately
1793                         unset( $tables['searchindex_content'] );
1794                         unset( $tables['searchindex_segdir'] );
1795                         unset( $tables['searchindex_segments'] );
1796                         $tables = array_flip( $tables );
1797                 }
1798
1799                 return $tables;
1800         }
1801
1802         /**
1803          * Copy test data from one database connection to another.
1804          *
1805          * This should only be used for small data sets.
1806          *
1807          * @param IDatabase $source
1808          * @param IDatabase $target
1809          */
1810         public function copyTestData( IDatabase $source, IDatabase $target ) {
1811                 $tables = self::listOriginalTables( $source, 'unprefixed' );
1812
1813                 foreach ( $tables as $table ) {
1814                         $res = $source->select( $table, '*', [], __METHOD__ );
1815                         $allRows = [];
1816
1817                         foreach ( $res as $row ) {
1818                                 $allRows[] = (array)$row;
1819                         }
1820
1821                         $target->insert( $table, $allRows, __METHOD__, [ 'IGNORE' ] );
1822                 }
1823         }
1824
1825         /**
1826          * @throws MWException
1827          * @since 1.18
1828          */
1829         protected function checkDbIsSupported() {
1830                 if ( !in_array( $this->db->getType(), $this->supportedDBs ) ) {
1831                         throw new MWException( $this->db->getType() . " is not currently supported for unit testing." );
1832                 }
1833         }
1834
1835         /**
1836          * @since 1.18
1837          * @param string $offset
1838          * @return mixed
1839          */
1840         public function getCliArg( $offset ) {
1841                 return $this->cliArgs[$offset] ?? null;
1842         }
1843
1844         /**
1845          * @since 1.18
1846          * @param string $offset
1847          * @param mixed $value
1848          */
1849         public function setCliArg( $offset, $value ) {
1850                 $this->cliArgs[$offset] = $value;
1851         }
1852
1853         /**
1854          * Don't throw a warning if $function is deprecated and called later
1855          *
1856          * @since 1.19
1857          *
1858          * @param string $function
1859          */
1860         public function hideDeprecated( $function ) {
1861                 Wikimedia\suppressWarnings();
1862                 wfDeprecated( $function );
1863                 Wikimedia\restoreWarnings();
1864         }
1865
1866         /**
1867          * Asserts that the given database query yields the rows given by $expectedRows.
1868          * The expected rows should be given as indexed (not associative) arrays, with
1869          * the values given in the order of the columns in the $fields parameter.
1870          * Note that the rows are sorted by the columns given in $fields.
1871          *
1872          * @since 1.20
1873          *
1874          * @param string|array $table The table(s) to query
1875          * @param string|array $fields The columns to include in the result (and to sort by)
1876          * @param string|array $condition "where" condition(s)
1877          * @param array $expectedRows An array of arrays giving the expected rows.
1878          * @param array $options Options for the query
1879          * @param array $join_conds Join conditions for the query
1880          *
1881          * @throws MWException If this test cases's needsDB() method doesn't return true.
1882          *         Test cases can use "@group Database" to enable database test support,
1883          *         or list the tables under testing in $this->tablesUsed, or override the
1884          *         needsDB() method.
1885          */
1886         protected function assertSelect(
1887                 $table, $fields, $condition, array $expectedRows, array $options = [], array $join_conds = []
1888         ) {
1889                 if ( !$this->needsDB() ) {
1890                         throw new MWException( 'When testing database state, the test cases\'s needDB()' .
1891                                 ' method should return true. Use @group Database or $this->tablesUsed.' );
1892                 }
1893
1894                 $db = wfGetDB( DB_REPLICA );
1895
1896                 $res = $db->select(
1897                         $table,
1898                         $fields,
1899                         $condition,
1900                         wfGetCaller(),
1901                         $options + [ 'ORDER BY' => $fields ],
1902                         $join_conds
1903                 );
1904                 $this->assertNotEmpty( $res, "query failed: " . $db->lastError() );
1905
1906                 $i = 0;
1907
1908                 foreach ( $expectedRows as $expected ) {
1909                         $r = $res->fetchRow();
1910                         self::stripStringKeys( $r );
1911
1912                         $i += 1;
1913                         $this->assertNotEmpty( $r, "row #$i missing" );
1914
1915                         $this->assertEquals( $expected, $r, "row #$i mismatches" );
1916                 }
1917
1918                 $r = $res->fetchRow();
1919                 self::stripStringKeys( $r );
1920
1921                 $this->assertFalse( $r, "found extra row (after #$i)" );
1922         }
1923
1924         /**
1925          * Utility method taking an array of elements and wrapping
1926          * each element in its own array. Useful for data providers
1927          * that only return a single argument.
1928          *
1929          * @since 1.20
1930          *
1931          * @param array $elements
1932          *
1933          * @return array
1934          */
1935         protected function arrayWrap( array $elements ) {
1936                 return array_map(
1937                         function ( $element ) {
1938                                 return [ $element ];
1939                         },
1940                         $elements
1941                 );
1942         }
1943
1944         /**
1945          * Assert that two arrays are equal. By default this means that both arrays need to hold
1946          * the same set of values. Using additional arguments, order and associated key can also
1947          * be set as relevant.
1948          *
1949          * @since 1.20
1950          *
1951          * @param array $expected
1952          * @param array $actual
1953          * @param bool $ordered If the order of the values should match
1954          * @param bool $named If the keys should match
1955          */
1956         protected function assertArrayEquals( array $expected, array $actual,
1957                 $ordered = false, $named = false
1958         ) {
1959                 if ( !$ordered ) {
1960                         $this->objectAssociativeSort( $expected );
1961                         $this->objectAssociativeSort( $actual );
1962                 }
1963
1964                 if ( !$named ) {
1965                         $expected = array_values( $expected );
1966                         $actual = array_values( $actual );
1967                 }
1968
1969                 call_user_func_array(
1970                         [ $this, 'assertEquals' ],
1971                         array_merge( [ $expected, $actual ], array_slice( func_get_args(), 4 ) )
1972                 );
1973         }
1974
1975         /**
1976          * Put each HTML element on its own line and then equals() the results
1977          *
1978          * Use for nicely formatting of PHPUnit diff output when comparing very
1979          * simple HTML
1980          *
1981          * @since 1.20
1982          *
1983          * @param string $expected HTML on oneline
1984          * @param string $actual HTML on oneline
1985          * @param string $msg Optional message
1986          */
1987         protected function assertHTMLEquals( $expected, $actual, $msg = '' ) {
1988                 $expected = str_replace( '>', ">\n", $expected );
1989                 $actual = str_replace( '>', ">\n", $actual );
1990
1991                 $this->assertEquals( $expected, $actual, $msg );
1992         }
1993
1994         /**
1995          * Does an associative sort that works for objects.
1996          *
1997          * @since 1.20
1998          *
1999          * @param array &$array
2000          */
2001         protected function objectAssociativeSort( array &$array ) {
2002                 uasort(
2003                         $array,
2004                         function ( $a, $b ) {
2005                                 return serialize( $a ) <=> serialize( $b );
2006                         }
2007                 );
2008         }
2009
2010         /**
2011          * Utility function for eliminating all string keys from an array.
2012          * Useful to turn a database result row as returned by fetchRow() into
2013          * a pure indexed array.
2014          *
2015          * @since 1.20
2016          *
2017          * @param mixed &$r The array to remove string keys from.
2018          */
2019         protected static function stripStringKeys( &$r ) {
2020                 if ( !is_array( $r ) ) {
2021                         return;
2022                 }
2023
2024                 foreach ( $r as $k => $v ) {
2025                         if ( is_string( $k ) ) {
2026                                 unset( $r[$k] );
2027                         }
2028                 }
2029         }
2030
2031         /**
2032          * Asserts that the provided variable is of the specified
2033          * internal type or equals the $value argument. This is useful
2034          * for testing return types of functions that return a certain
2035          * type or *value* when not set or on error.
2036          *
2037          * @since 1.20
2038          *
2039          * @param string $type
2040          * @param mixed $actual
2041          * @param mixed $value
2042          * @param string $message
2043          */
2044         protected function assertTypeOrValue( $type, $actual, $value = false, $message = '' ) {
2045                 if ( $actual === $value ) {
2046                         $this->assertTrue( true, $message );
2047                 } else {
2048                         $this->assertType( $type, $actual, $message );
2049                 }
2050         }
2051
2052         /**
2053          * Asserts the type of the provided value. This can be either
2054          * in internal type such as boolean or integer, or a class or
2055          * interface the value extends or implements.
2056          *
2057          * @since 1.20
2058          *
2059          * @param string $type
2060          * @param mixed $actual
2061          * @param string $message
2062          */
2063         protected function assertType( $type, $actual, $message = '' ) {
2064                 if ( class_exists( $type ) || interface_exists( $type ) ) {
2065                         $this->assertInstanceOf( $type, $actual, $message );
2066                 } else {
2067                         $this->assertInternalType( $type, $actual, $message );
2068                 }
2069         }
2070
2071         /**
2072          * Returns true if the given namespace defaults to Wikitext
2073          * according to $wgNamespaceContentModels
2074          *
2075          * @param int $ns The namespace ID to check
2076          *
2077          * @return bool
2078          * @since 1.21
2079          */
2080         protected function isWikitextNS( $ns ) {
2081                 global $wgNamespaceContentModels;
2082
2083                 if ( isset( $wgNamespaceContentModels[$ns] ) ) {
2084                         return $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT;
2085                 }
2086
2087                 return true;
2088         }
2089
2090         /**
2091          * Returns the ID of a namespace that defaults to Wikitext.
2092          *
2093          * @throws MWException If there is none.
2094          * @return int The ID of the wikitext Namespace
2095          * @since 1.21
2096          */
2097         protected function getDefaultWikitextNS() {
2098                 global $wgNamespaceContentModels;
2099
2100                 static $wikitextNS = null; // this is not going to change
2101                 if ( $wikitextNS !== null ) {
2102                         return $wikitextNS;
2103                 }
2104
2105                 // quickly short out on most common case:
2106                 if ( !isset( $wgNamespaceContentModels[NS_MAIN] ) ) {
2107                         return NS_MAIN;
2108                 }
2109
2110                 // NOTE: prefer content namespaces
2111                 $namespaces = array_unique( array_merge(
2112                         MWNamespace::getContentNamespaces(),
2113                         [ NS_MAIN, NS_HELP, NS_PROJECT ], // prefer these
2114                         MWNamespace::getValidNamespaces()
2115                 ) );
2116
2117                 $namespaces = array_diff( $namespaces, [
2118                         NS_FILE, NS_CATEGORY, NS_MEDIAWIKI, NS_USER // don't mess with magic namespaces
2119                 ] );
2120
2121                 $talk = array_filter( $namespaces, function ( $ns ) {
2122                         return MWNamespace::isTalk( $ns );
2123                 } );
2124
2125                 // prefer non-talk pages
2126                 $namespaces = array_diff( $namespaces, $talk );
2127                 $namespaces = array_merge( $namespaces, $talk );
2128
2129                 // check default content model of each namespace
2130                 foreach ( $namespaces as $ns ) {
2131                         if ( !isset( $wgNamespaceContentModels[$ns] ) ||
2132                                 $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT
2133                         ) {
2134                                 $wikitextNS = $ns;
2135
2136                                 return $wikitextNS;
2137                         }
2138                 }
2139
2140                 // give up
2141                 // @todo Inside a test, we could skip the test as incomplete.
2142                 //        But frequently, this is used in fixture setup.
2143                 throw new MWException( "No namespace defaults to wikitext!" );
2144         }
2145
2146         /**
2147          * Check, if $wgDiff3 is set and ready to merge
2148          * Will mark the calling test as skipped, if not ready
2149          *
2150          * @since 1.21
2151          */
2152         protected function markTestSkippedIfNoDiff3() {
2153                 global $wgDiff3;
2154
2155                 # This check may also protect against code injection in
2156                 # case of broken installations.
2157                 Wikimedia\suppressWarnings();
2158                 $haveDiff3 = $wgDiff3 && file_exists( $wgDiff3 );
2159                 Wikimedia\restoreWarnings();
2160
2161                 if ( !$haveDiff3 ) {
2162                         $this->markTestSkipped( "Skip test, since diff3 is not configured" );
2163                 }
2164         }
2165
2166         /**
2167          * Check if $extName is a loaded PHP extension, will skip the
2168          * test whenever it is not loaded.
2169          *
2170          * @since 1.21
2171          * @param string $extName
2172          * @return bool
2173          */
2174         protected function checkPHPExtension( $extName ) {
2175                 $loaded = extension_loaded( $extName );
2176                 if ( !$loaded ) {
2177                         $this->markTestSkipped( "PHP extension '$extName' is not loaded, skipping." );
2178                 }
2179
2180                 return $loaded;
2181         }
2182
2183         /**
2184          * Skip the test if using the specified database type
2185          *
2186          * @param string $type Database type
2187          * @since 1.32
2188          */
2189         protected function markTestSkippedIfDbType( $type ) {
2190                 if ( $this->db->getType() === $type ) {
2191                         $this->markTestSkipped( "The $type database type isn't supported for this test" );
2192                 }
2193         }
2194
2195         /**
2196          * Used as a marker to prevent wfResetOutputBuffers from breaking PHPUnit.
2197          * @param string $buffer
2198          * @return string
2199          */
2200         public static function wfResetOutputBuffersBarrier( $buffer ) {
2201                 return $buffer;
2202         }
2203
2204         /**
2205          * Create a temporary hook handler which will be reset by tearDown.
2206          * This replaces other handlers for the same hook.
2207          * @param string $hookName Hook name
2208          * @param mixed $handler Value suitable for a hook handler
2209          * @since 1.28
2210          */
2211         protected function setTemporaryHook( $hookName, $handler ) {
2212                 $this->mergeMwGlobalArrayValue( 'wgHooks', [ $hookName => [ $handler ] ] );
2213         }
2214
2215         /**
2216          * Check whether file contains given data.
2217          * @param string $fileName
2218          * @param string $actualData
2219          * @param bool $createIfMissing If true, and file does not exist, create it with given data
2220          *                              and skip the test.
2221          * @param string $msg
2222          * @since 1.30
2223          */
2224         protected function assertFileContains(
2225                 $fileName,
2226                 $actualData,
2227                 $createIfMissing = false,
2228                 $msg = ''
2229         ) {
2230                 if ( $createIfMissing ) {
2231                         if ( !file_exists( $fileName ) ) {
2232                                 file_put_contents( $fileName, $actualData );
2233                                 $this->markTestSkipped( 'Data file $fileName does not exist' );
2234                         }
2235                 } else {
2236                         self::assertFileExists( $fileName );
2237                 }
2238                 self::assertEquals( file_get_contents( $fileName ), $actualData, $msg );
2239         }
2240
2241         /**
2242          * Edits or creates a page/revision
2243          * @param string $pageName Page title
2244          * @param string $text Content of the page
2245          * @param string $summary Optional summary string for the revision
2246          * @param int $defaultNs Optional namespace id
2247          * @return array Array as returned by WikiPage::doEditContent()
2248          */
2249         protected function editPage( $pageName, $text, $summary = '', $defaultNs = NS_MAIN ) {
2250                 $title = Title::newFromText( $pageName, $defaultNs );
2251                 $page = WikiPage::factory( $title );
2252
2253                 return $page->doEditContent( ContentHandler::makeContent( $text, $title ), $summary );
2254         }
2255
2256         /**
2257          * Revision-deletes a revision.
2258          *
2259          * @param Revision|int $rev Revision to delete
2260          * @param array $value Keys are Revision::DELETED_* flags.  Values are 1 to set the bit, 0 to
2261          *   clear, -1 to leave alone.  (All other values also clear the bit.)
2262          * @param string $comment Deletion comment
2263          */
2264         protected function revisionDelete(
2265                 $rev, array $value = [ Revision::DELETED_TEXT => 1 ], $comment = ''
2266         ) {
2267                 if ( is_int( $rev ) ) {
2268                         $rev = Revision::newFromId( $rev );
2269                 }
2270                 RevisionDeleter::createList(
2271                         'revision', RequestContext::getMain(), $rev->getTitle(), [ $rev->getId() ]
2272                 )->setVisibility( [
2273                         'value' => $value,
2274                         'comment' => $comment,
2275                 ] );
2276         }
2277 }