tests/phpunit/MediaWikiTestCase.php

   1 <?php
   2
   3 abstract class MediaWikiTestCase extends PHPUnit_Framework_TestCase {
   4         public $suite;
   5         public $regex = '';
   6         public $runDisabled = false;
   7
   8         /**
   9          * $called tracks whether the setUp and tearDown method has been called.
  10          * class extending MediaWikiTestCase usually override setUp and tearDown
  11          * but forget to call the parent.
  12          *
  13          * The array format takes a method name as key and anything as a value.
  14          * By asserting the key exist, we know the child class has called the
  15          * parent.
  16          *
  17          * This property must be private, we do not want child to override it,
  18          * they should call the appropriate parent method instead.
  19          */
  20         private $called = array();
  21
  22         /**
  23          * @var Array of TestUser
  24          */
  25         public static $users;
  26
  27         /**
  28          * @var DatabaseBase
  29          */
  30         protected $db;
  31         protected $tablesUsed = array(); // tables with data
  32
  33         private static $useTemporaryTables = true;
  34         private static $reuseDB = false;
  35         private static $dbSetup = false;
  36         private static $oldTablePrefix = false;
  37
  38         /**
  39          * Holds the paths of temporary files/directories created through getNewTempFile,
  40          * and getNewTempDirectory
  41          *
  42          * @var array
  43          */
  44         private $tmpfiles = array();
  45
  46         /**
  47          * Holds original values of MediaWiki configuration settings
  48          * to be restored in tearDown().
  49          * See also setMwGlobal().
  50          * @var array
  51          */
  52         private $mwGlobals = array();
  53
  54         /**
  55          * Table name prefixes. Oracle likes it shorter.
  56          */
  57         const DB_PREFIX = 'unittest_';
  58         const ORA_DB_PREFIX = 'ut_';
  59
  60         protected $supportedDBs = array(
  61                 'mysql',
  62                 'sqlite',
  63                 'postgres',
  64                 'oracle'
  65         );
  66
  67         function  __construct( $name = null, array $data = array(), $dataName = '' ) {
  68                 parent::__construct( $name, $data, $dataName );
  69
  70                 $this->backupGlobals = false;
  71                 $this->backupStaticAttributes = false;
  72         }
  73
  74         function run( PHPUnit_Framework_TestResult $result = null ) {
  75                 /* Some functions require some kind of caching, and will end up using the db,
  76                  * which we can't allow, as that would open a new connection for mysql.
  77                  * Replace with a HashBag. They would not be going to persist anyway.
  78                  */
  79                 ObjectCache::$instances[CACHE_DB] = new HashBagOStuff;
  80
  81                 $needsResetDB = false;
  82                 $logName = get_class( $this ) . '::' . $this->getName( false );
  83
  84                 if( $this->needsDB() ) {
  85                         // set up a DB connection for this test to use
  86
  87                         self::$useTemporaryTables = !$this->getCliArg( 'use-normal-tables' );
  88                         self::$reuseDB = $this->getCliArg('reuse-db');
  89
  90                         $this->db = wfGetDB( DB_MASTER );
  91
  92                         $this->checkDbIsSupported();
  93
  94                         if( !self::$dbSetup ) {
  95                                 wfProfileIn( $logName . ' (clone-db)' );
  96
  97                                 // switch to a temporary clone of the database
  98                                 self::setupTestDB( $this->db, $this->dbPrefix() );
  99
 100                                 if ( ( $this->db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
 101                                         $this->resetDB();
 102                                 }
 103
 104                                 wfProfileOut( $logName . ' (clone-db)' );
 105                         }
 106
 107                         wfProfileIn( $logName . ' (prepare-db)' );
 108                         $this->addCoreDBData();
 109                         $this->addDBData();
 110                         wfProfileOut( $logName . ' (prepare-db)' );
 111
 112                         $needsResetDB = true;
 113                 }
 114
 115                 wfProfileIn( $logName );
 116                 parent::run( $result );
 117                 wfProfileOut( $logName );
 118
 119                 if( $needsResetDB ) {
 120                         wfProfileIn( $logName . ' (reset-db)' );
 121                         $this->resetDB();
 122                         wfProfileOut( $logName . ' (reset-db)' );
 123                 }
 124         }
 125
 126         /**
 127          * obtains a new temporary file name
 128          *
 129          * The obtained filename is enlisted to be removed upon tearDown
 130          *
 131          * @returns string: absolute name of the temporary file
 132          */
 133         protected function getNewTempFile() {
 134                 $fname = tempnam( wfTempDir(), 'MW_PHPUnit_' . get_class( $this ) . '_' );
 135                 $this->tmpfiles[] = $fname;
 136                 return $fname;
 137         }
 138
 139         /**
 140          * obtains a new temporary directory
 141          *
 142          * The obtained directory is enlisted to be removed (recursively with all its contained
 143          * files) upon tearDown.
 144          *
 145          * @returns string: absolute name of the temporary directory
 146          */
 147         protected function getNewTempDirectory() {
 148                 // Starting of with a temporary /file/.
 149                 $fname = $this->getNewTempFile();
 150
 151                 // Converting the temporary /file/ to a /directory/
 152                 //
 153                 // The following is not atomic, but at least we now have a single place,
 154                 // where temporary directory creation is bundled and can be improved
 155                 unlink( $fname );
 156                 $this->assertTrue( wfMkdirParents( $fname ) );
 157                 return $fname;
 158         }
 159
 160         /**
 161          * setUp and tearDown should (where significant)
 162          * happen in reverse order.
 163          */
 164         protected function setUp() {
 165                 wfProfileIn( __METHOD__ );
 166                 parent::setUp();
 167                 $this->called['setUp'] = 1;
 168
 169                 /*
 170                 //@todo: global variables to restore for *every* test
 171                 array(
 172                         'wgLang',
 173                         'wgContLang',
 174                         'wgLanguageCode',
 175                         'wgUser',
 176                         'wgTitle',
 177                 );
 178                 */
 179
 180                 // Cleaning up temporary files
 181                 foreach ( $this->tmpfiles as $fname ) {
 182                         if ( is_file( $fname ) || ( is_link( $fname ) ) ) {
 183                                 unlink( $fname );
 184                         } elseif ( is_dir( $fname ) ) {
 185                                 wfRecursiveRemoveDir( $fname );
 186                         }
 187                 }
 188
 189                 if ( $this->needsDB() && $this->db ) {
 190                         // Clean up open transactions
 191                         while( $this->db->trxLevel() > 0 ) {
 192                                 $this->db->rollback();
 193                         }
 194
 195                         // don't ignore DB errors
 196                         $this->db->ignoreErrors( false );
 197                 }
 198
 199                 wfProfileOut( __METHOD__ );
 200         }
 201
 202         protected function tearDown() {
 203                 wfProfileIn( __METHOD__ );
 204
 205                 // Cleaning up temporary files
 206                 foreach ( $this->tmpfiles as $fname ) {
 207                         if ( is_file( $fname ) || ( is_link( $fname ) ) ) {
 208                                 unlink( $fname );
 209                         } elseif ( is_dir( $fname ) ) {
 210                                 wfRecursiveRemoveDir( $fname );
 211                         }
 212                 }
 213
 214                 if ( $this->needsDB() && $this->db ) {
 215                         // Clean up open transactions
 216                         while( $this->db->trxLevel() > 0 ) {
 217                                 $this->db->rollback();
 218                         }
 219
 220                         // don't ignore DB errors
 221                         $this->db->ignoreErrors( false );
 222                 }
 223
 224                 // Restore mw globals
 225                 foreach ( $this->mwGlobals as $key => $value ) {
 226                         $GLOBALS[$key] = $value;
 227                 }
 228                 $this->mwGlobals = array();
 229
 230                 parent::tearDown();
 231                 wfProfileOut( __METHOD__ );
 232         }
 233
 234         /**
 235          * Make sure MediaWikiTestCase extending classes have called their
 236          * parent setUp method
 237          */
 238         final public function testMediaWikiTestCaseParentSetupCalled() {
 239                 $this->assertArrayHasKey( 'setUp', $this->called,
 240                         get_called_class() . "::setUp() must call parent::setUp()"
 241                 );
 242         }
 243
 244         /**
 245          * Individual test functions may override globals (either directly or through this
 246          * setMwGlobals() function), however one must call this method at least once for
 247          * each key within the setUp().
 248          * That way the key is added to the array of globals that will be reset afterwards
 249          * in the tearDown(). And, equally important, that way all other tests are executed
 250          * with the same settings (instead of using the unreliable local settings for most
 251          * tests and fix it only for some tests).
 252          *
 253          * @example
 254          * <code>
 255          *     protected function setUp() {
 256          *         $this->setMwGlobals( 'wgRestrictStuff', true );
 257          *     }
 258          *
 259          *     function testFoo() {}
 260          *
 261          *     function testBar() {}
 262          *         $this->assertTrue( self::getX()->doStuff() );
 263          *
 264          *         $this->setMwGlobals( 'wgRestrictStuff', false );
 265          *         $this->assertTrue( self::getX()->doStuff() );
 266          *     }
 267          *
 268          *     function testQuux() {}
 269          * </code>
 270          *
 271          * @param array|string $pairs Key to the global variable, or an array
 272          *  of key/value pairs.
 273          * @param mixed $value Value to set the global to (ignored
 274          *  if an array is given as first argument).
 275          */
 276         protected function setMwGlobals( $pairs, $value = null ) {
 277
 278                 // Normalize (string, value) to an array
 279                 if( is_string( $pairs ) ) {
 280                         $pairs = array( $pairs => $value );
 281                 }
 282
 283                 foreach ( $pairs as $key => $value ) {
 284                         // NOTE: make sure we only save the global once or a second call to
 285                         // setMwGlobals() on the same global would override the original
 286                         // value.
 287                         if ( !array_key_exists( $key, $this->mwGlobals ) ) {
 288                                 $this->mwGlobals[$key] = $GLOBALS[$key];
 289                         }
 290
 291                         // Override the global
 292                         $GLOBALS[$key] = $value;
 293                 }
 294         }
 295
 296         /**
 297          * Merges the given values into a MW global array variable.
 298          * Useful for setting some entries in a configuration array, instead of
 299          * setting the entire array.
 300          *
 301          * @param String $name The name of the global, as in wgFooBar
 302          * @param Array $values The array containing the entries to set in that global
 303          *
 304          * @throws MWException if the designated global is not an array.
 305          */
 306         protected function mergeMwGlobalArrayValue( $name, $values ) {
 307                 if ( !isset( $GLOBALS[$name] ) ) {
 308                         $merged = $values;
 309                 } else {
 310                         if ( !is_array( $GLOBALS[$name] ) ) {
 311                                 throw new MWException( "MW global $name is not an array." );
 312                         }
 313
 314                         // NOTE: do not use array_merge, it screws up for numeric keys.
 315                         $merged = $GLOBALS[$name];
 316                         foreach ( $values as $k => $v ) {
 317                                 $merged[$k] = $v;
 318                         }
 319                 }
 320
 321                 $this->setMwGlobals( $name, $merged );
 322         }
 323
 324         function dbPrefix() {
 325                 return $this->db->getType() == 'oracle' ? self::ORA_DB_PREFIX : self::DB_PREFIX;
 326         }
 327
 328         function needsDB() {
 329                 # if the test says it uses database tables, it needs the database
 330                 if ( $this->tablesUsed ) {
 331                         return true;
 332                 }
 333
 334                 # if the test says it belongs to the Database group, it needs the database
 335                 $rc = new ReflectionClass( $this );
 336                 if ( preg_match( '/@group +Database/im', $rc->getDocComment() ) ) {
 337                         return true;
 338                 }
 339
 340                 return false;
 341         }
 342
 343         /**
 344          * Stub. If a test needs to add additional data to the database, it should
 345          * implement this method and do so
 346          */
 347         function addDBData() {}
 348
 349         private function addCoreDBData() {
 350                 # disabled for performance
 351                 #$this->tablesUsed[] = 'page';
 352                 #$this->tablesUsed[] = 'revision';
 353
 354                 if ( $this->db->getType() == 'oracle' ) {
 355
 356                         # Insert 0 user to prevent FK violations
 357                         # Anonymous user
 358                         $this->db->insert( 'user', array(
 359                                 'user_id'               => 0,
 360                                 'user_name'     => 'Anonymous' ), __METHOD__, array( 'IGNORE' ) );
 361
 362                         # Insert 0 page to prevent FK violations
 363                         # Blank page
 364                         $this->db->insert( 'page', array(
 365                                 'page_id' => 0,
 366                                 'page_namespace' => 0,
 367                                 'page_title' => ' ',
 368                                 'page_restrictions' => null,
 369                                 'page_counter' => 0,
 370                                 'page_is_redirect' => 0,
 371                                 'page_is_new' => 0,
 372                                 'page_random' => 0,
 373                                 'page_touched' => $this->db->timestamp(),
 374                                 'page_latest' => 0,
 375                                 'page_len' => 0 ), __METHOD__, array( 'IGNORE' ) );
 376
 377                 }
 378
 379                 User::resetIdByNameCache();
 380
 381                 //Make sysop user
 382                 $user = User::newFromName( 'UTSysop' );
 383
 384                 if ( $user->idForName() == 0 ) {
 385                         $user->addToDatabase();
 386                         $user->setPassword( 'UTSysopPassword' );
 387
 388                         $user->addGroup( 'sysop' );
 389                         $user->addGroup( 'bureaucrat' );
 390                         $user->saveSettings();
 391                 }
 392
 393
 394                 //Make 1 page with 1 revision
 395                 $page = WikiPage::factory( Title::newFromText( 'UTPage' ) );
 396                 if ( !$page->getId() == 0 ) {
 397                         $page->doEditContent(
 398                                 new WikitextContent( 'UTContent' ),
 399                                 'UTPageSummary',
 400                                 EDIT_NEW,
 401                                 false,
 402                                 User::newFromName( 'UTSysop' ) );
 403                 }
 404         }
 405
 406         /**
 407          * Restores MediaWiki to using the table set (table prefix) it was using before
 408          * setupTestDB() was called. Useful if we need to perform database operations
 409          * after the test run has finished (such as saving logs or profiling info).
 410          */
 411         public static function teardownTestDB() {
 412                 if ( !self::$dbSetup ) {
 413                         return;
 414                 }
 415
 416                 CloneDatabase::changePrefix( self::$oldTablePrefix );
 417
 418                 self::$oldTablePrefix = false;
 419                 self::$dbSetup = false;
 420         }
 421
 422         /**
 423          * Creates an empty skeleton of the wiki database by cloning its structure
 424          * to equivalent tables using the given $prefix. Then sets MediaWiki to
 425          * use the new set of tables (aka schema) instead of the original set.
 426          *
 427          * This is used to generate a dummy table set, typically consisting of temporary
 428          * tables, that will be used by tests instead of the original wiki database tables.
 429          *
 430          * @note: the original table prefix is stored in self::$oldTablePrefix. This is used
 431          * by teardownTestDB() to return the wiki to using the original table set.
 432          *
 433          * @note: this method only works when first called. Subsequent calls have no effect,
 434          * even if using different parameters.
 435          *
 436          * @param DatabaseBase $db The database connection
 437          * @param String  $prefix The prefix to use for the new table set (aka schema).
 438          *
 439          * @throws MWException if the database table prefix is already $prefix
 440          */
 441         public static function setupTestDB( DatabaseBase $db, $prefix ) {
 442                 global $wgDBprefix;
 443                 if ( $wgDBprefix === $prefix ) {
 444                         throw new MWException( 'Cannot run unit tests, the database prefix is already "' . $prefix . '"' );
 445                 }
 446
 447                 if ( self::$dbSetup ) {
 448                         return;
 449                 }
 450
 451                 $tablesCloned = self::listTables( $db );
 452                 $dbClone = new CloneDatabase( $db, $tablesCloned, $prefix );
 453                 $dbClone->useTemporaryTables( self::$useTemporaryTables );
 454
 455                 self::$dbSetup = true;
 456                 self::$oldTablePrefix = $wgDBprefix;
 457
 458                 if ( ( $db->getType() == 'oracle' || !self::$useTemporaryTables ) && self::$reuseDB ) {
 459                         CloneDatabase::changePrefix( $prefix );
 460                         return;
 461                 } else {
 462                         $dbClone->cloneTableStructure();
 463                 }
 464
 465                 if ( $db->getType() == 'oracle' ) {
 466                         $db->query( 'BEGIN FILL_WIKI_INFO; END;' );
 467                 }
 468         }
 469
 470         /**
 471          * Empty all tables so they can be repopulated for tests
 472          */
 473         private function resetDB() {
 474                 if( $this->db ) {
 475                         if ( $this->db->getType() == 'oracle' )  {
 476                                 if ( self::$useTemporaryTables ) {
 477                                         wfGetLB()->closeAll();
 478                                         $this->db = wfGetDB( DB_MASTER );
 479                                 } else {
 480                                         foreach( $this->tablesUsed as $tbl ) {
 481                                                 if( $tbl == 'interwiki') continue;
 482                                                 $this->db->query( 'TRUNCATE TABLE '.$this->db->tableName($tbl), __METHOD__ );
 483                                         }
 484                                 }
 485                         } else {
 486                                 foreach( $this->tablesUsed as $tbl ) {
 487                                         if( $tbl == 'interwiki' || $tbl == 'user' ) continue;
 488                                         $this->db->delete( $tbl, '*', __METHOD__ );
 489                                 }
 490                         }
 491                 }
 492         }
 493
 494         function __call( $func, $args ) {
 495                 static $compatibility = array(
 496                         'assertInternalType' => 'assertType',
 497                         'assertNotInternalType' => 'assertNotType',
 498                         'assertInstanceOf' => 'assertType',
 499                         'assertEmpty' => 'assertEmpty2',
 500                 );
 501
 502                 if ( method_exists( $this->suite, $func ) ) {
 503                         return call_user_func_array( array( $this->suite, $func ), $args);
 504                 } elseif ( isset( $compatibility[$func] ) ) {
 505                         return call_user_func_array( array( $this, $compatibility[$func] ), $args);
 506                 } else {
 507                         throw new MWException( "Called non-existant $func method on "
 508                                 . get_class( $this ) );
 509                 }
 510         }
 511
 512         private function assertEmpty2( $value, $msg ) {
 513                 return $this->assertTrue( $value == '', $msg );
 514         }
 515
 516         private static function unprefixTable( $tableName ) {
 517                 global $wgDBprefix;
 518                 return substr( $tableName, strlen( $wgDBprefix ) );
 519         }
 520
 521         private static function isNotUnittest( $table ) {
 522                 return strpos( $table, 'unittest_' ) !== 0;
 523         }
 524
 525         public static function listTables( $db ) {
 526                 global $wgDBprefix;
 527
 528                 $tables = $db->listTables( $wgDBprefix, __METHOD__ );
 529                 $tables = array_map( array( __CLASS__, 'unprefixTable' ), $tables );
 530
 531                 // Don't duplicate test tables from the previous fataled run
 532                 $tables = array_filter( $tables, array( __CLASS__, 'isNotUnittest' ) );
 533
 534                 if ( $db->getType() == 'sqlite' ) {
 535                         $tables = array_flip( $tables );
 536                         // these are subtables of searchindex and don't need to be duped/dropped separately
 537                         unset( $tables['searchindex_content'] );
 538                         unset( $tables['searchindex_segdir'] );
 539                         unset( $tables['searchindex_segments'] );
 540                         $tables = array_flip( $tables );
 541                 }
 542                 return $tables;
 543         }
 544
 545         protected function checkDbIsSupported() {
 546                 if( !in_array( $this->db->getType(), $this->supportedDBs ) ) {
 547                         throw new MWException( $this->db->getType() . " is not currently supported for unit testing." );
 548                 }
 549         }
 550
 551         public function getCliArg( $offset ) {
 552
 553                 if( isset( MediaWikiPHPUnitCommand::$additionalOptions[$offset] ) ) {
 554                         return MediaWikiPHPUnitCommand::$additionalOptions[$offset];
 555                 }
 556
 557         }
 558
 559         public function setCliArg( $offset, $value ) {
 560
 561                 MediaWikiPHPUnitCommand::$additionalOptions[$offset] = $value;
 562
 563         }
 564
 565         /**
 566          * Don't throw a warning if $function is deprecated and called later
 567          *
 568          * @param $function String
 569          * @return null
 570          */
 571         function hideDeprecated( $function ) {
 572                 wfSuppressWarnings();
 573                 wfDeprecated( $function );
 574                 wfRestoreWarnings();
 575         }
 576
 577         /**
 578          * Asserts that the given database query yields the rows given by $expectedRows.
 579          * The expected rows should be given as indexed (not associative) arrays, with
 580          * the values given in the order of the columns in the $fields parameter.
 581          * Note that the rows are sorted by the columns given in $fields.
 582          *
 583          * @since 1.20
 584          *
 585          * @param $table String|Array the table(s) to query
 586          * @param $fields String|Array the columns to include in the result (and to sort by)
 587          * @param $condition String|Array "where" condition(s)
 588          * @param $expectedRows Array - an array of arrays giving the expected rows.
 589          *
 590          * @throws MWException if this test cases's needsDB() method doesn't return true.
 591          *         Test cases can use "@group Database" to enable database test support,
 592          *         or list the tables under testing in $this->tablesUsed, or override the
 593          *         needsDB() method.
 594          */
 595         protected function assertSelect( $table, $fields, $condition, array $expectedRows ) {
 596                 if ( !$this->needsDB() ) {
 597                         throw new MWException( 'When testing database state, the test cases\'s needDB()' .
 598                                 ' method should return true. Use @group Database or $this->tablesUsed.');
 599                 }
 600
 601                 $db = wfGetDB( DB_SLAVE );
 602
 603                 $res = $db->select( $table, $fields, $condition, wfGetCaller(), array( 'ORDER BY' => $fields ) );
 604                 $this->assertNotEmpty( $res, "query failed: " . $db->lastError() );
 605
 606                 $i = 0;
 607
 608                 foreach ( $expectedRows as $expected ) {
 609                         $r = $res->fetchRow();
 610                         self::stripStringKeys( $r );
 611
 612                         $i += 1;
 613                         $this->assertNotEmpty( $r, "row #$i missing" );
 614
 615                         $this->assertEquals( $expected, $r, "row #$i mismatches" );
 616                 }
 617
 618                 $r = $res->fetchRow();
 619                 self::stripStringKeys( $r );
 620
 621                 $this->assertFalse( $r, "found extra row (after #$i)" );
 622         }
 623
 624         /**
 625          * Utility method taking an array of elements and wrapping
 626          * each element in it's own array. Useful for data providers
 627          * that only return a single argument.
 628          *
 629          * @since 1.20
 630          *
 631          * @param array $elements
 632          *
 633          * @return array
 634          */
 635         protected function arrayWrap( array $elements ) {
 636                 return array_map(
 637                         function( $element ) {
 638                                 return array( $element );
 639                         },
 640                         $elements
 641                 );
 642         }
 643
 644         /**
 645          * Assert that two arrays are equal. By default this means that both arrays need to hold
 646          * the same set of values. Using additional arguments, order and associated key can also
 647          * be set as relevant.
 648          *
 649          * @since 1.20
 650          *
 651          * @param array $expected
 652          * @param array $actual
 653          * @param boolean $ordered If the order of the values should match
 654          * @param boolean $named If the keys should match
 655          */
 656         protected function assertArrayEquals( array $expected, array $actual, $ordered = false, $named = false ) {
 657                 if ( !$ordered ) {
 658                         $this->objectAssociativeSort( $expected );
 659                         $this->objectAssociativeSort( $actual );
 660                 }
 661
 662                 if ( !$named ) {
 663                         $expected = array_values( $expected );
 664                         $actual = array_values( $actual );
 665                 }
 666
 667                 call_user_func_array(
 668                         array( $this, 'assertEquals' ),
 669                         array_merge( array( $expected, $actual ), array_slice( func_get_args(), 4 ) )
 670                 );
 671         }
 672
 673         /**
 674          * Put each HTML element on its own line and then equals() the results
 675          *
 676          * Use for nicely formatting of PHPUnit diff output when comparing very
 677          * simple HTML
 678          *
 679          * @since 1.20
 680          *
 681          * @param String $expected HTML on oneline
 682          * @param String $actual HTML on oneline
 683          * @param String $msg Optional message
 684          */
 685         protected function assertHTMLEquals( $expected, $actual, $msg='' ) {
 686                 $expected = str_replace( '>', ">\n", $expected );
 687                 $actual   = str_replace( '>', ">\n", $actual   );
 688
 689                 $this->assertEquals( $expected, $actual, $msg );
 690         }
 691
 692         /**
 693          * Does an associative sort that works for objects.
 694          *
 695          * @since 1.20
 696          *
 697          * @param array $array
 698          */
 699         protected function objectAssociativeSort( array &$array ) {
 700                 uasort(
 701                         $array,
 702                         function( $a, $b ) {
 703                                 return serialize( $a ) > serialize( $b ) ? 1 : -1;
 704                         }
 705                 );
 706         }
 707
 708         /**
 709          * Utility function for eliminating all string keys from an array.
 710          * Useful to turn a database result row as returned by fetchRow() into
 711          * a pure indexed array.
 712          *
 713          * @since 1.20
 714          *
 715          * @param $r mixed the array to remove string keys from.
 716          */
 717         protected static function stripStringKeys( &$r ) {
 718                 if ( !is_array( $r ) ) {
 719                         return;
 720                 }
 721
 722                 foreach ( $r as $k => $v ) {
 723                         if ( is_string( $k ) ) {
 724                                 unset( $r[$k] );
 725                         }
 726                 }
 727         }
 728
 729         /**
 730          * Asserts that the provided variable is of the specified
 731          * internal type or equals the $value argument. This is useful
 732          * for testing return types of functions that return a certain
 733          * type or *value* when not set or on error.
 734          *
 735          * @since 1.20
 736          *
 737          * @param string $type
 738          * @param mixed $actual
 739          * @param mixed $value
 740          * @param string $message
 741          */
 742         protected function assertTypeOrValue( $type, $actual, $value = false, $message = '' ) {
 743                 if ( $actual === $value ) {
 744                         $this->assertTrue( true, $message );
 745                 }
 746                 else {
 747                         $this->assertType( $type, $actual, $message );
 748                 }
 749         }
 750
 751         /**
 752          * Asserts the type of the provided value. This can be either
 753          * in internal type such as boolean or integer, or a class or
 754          * interface the value extends or implements.
 755          *
 756          * @since 1.20
 757          *
 758          * @param string $type
 759          * @param mixed $actual
 760          * @param string $message
 761          */
 762         protected function assertType( $type, $actual, $message = '' ) {
 763                 if ( class_exists( $type ) || interface_exists( $type ) ) {
 764                         $this->assertInstanceOf( $type, $actual, $message );
 765                 }
 766                 else {
 767                         $this->assertInternalType( $type, $actual, $message );
 768                 }
 769         }
 770
 771         /**
 772          * Returns true iff the given namespace defaults to Wikitext
 773          * according to $wgNamespaceContentModels
 774          *
 775          * @param int $ns The namespace ID to check
 776          *
 777          * @return bool
 778          * @since 1.21
 779          */
 780         protected function isWikitextNS( $ns ) {
 781                 global $wgNamespaceContentModels;
 782
 783                 if ( isset( $wgNamespaceContentModels[$ns] ) ) {
 784                         return $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT;
 785                 }
 786
 787                 return true;
 788         }
 789
 790         /**
 791          * Returns the ID of a namespace that defaults to Wikitext.
 792          * Throws an MWException if there is none.
 793          *
 794          * @return int the ID of the wikitext Namespace
 795          * @since 1.21
 796          */
 797         protected function getDefaultWikitextNS() {
 798                 global $wgNamespaceContentModels;
 799
 800                 static $wikitextNS = null; // this is not going to change
 801                 if ( $wikitextNS !== null ) {
 802                         return $wikitextNS;
 803                 }
 804
 805                 // quickly short out on most common case:
 806                 if ( !isset( $wgNamespaceContentModels[NS_MAIN] ) ) {
 807                         return NS_MAIN;
 808                 }
 809
 810                 // NOTE: prefer content namespaces
 811                 $namespaces = array_unique( array_merge(
 812                         MWNamespace::getContentNamespaces(),
 813                         array( NS_MAIN, NS_HELP, NS_PROJECT ), // prefer these
 814                         MWNamespace::getValidNamespaces()
 815                 ) );
 816
 817                 $namespaces = array_diff( $namespaces, array(
 818                         NS_FILE, NS_CATEGORY, NS_MEDIAWIKI, NS_USER // don't mess with magic namespaces
 819                 ));
 820
 821                 $talk = array_filter( $namespaces, function ( $ns ) {
 822                         return MWNamespace::isTalk( $ns );
 823                 } );
 824
 825                 // prefer non-talk pages
 826                 $namespaces = array_diff( $namespaces, $talk );
 827                 $namespaces = array_merge( $namespaces, $talk );
 828
 829                 // check default content model of each namespace
 830                 foreach ( $namespaces as $ns ) {
 831                         if ( !isset( $wgNamespaceContentModels[$ns] ) ||
 832                                 $wgNamespaceContentModels[$ns] === CONTENT_MODEL_WIKITEXT ) {
 833
 834                                 $wikitextNS = $ns;
 835                                 return $wikitextNS;
 836                         }
 837                 }
 838
 839                 // give up
 840                 // @todo: Inside a test, we could skip the test as incomplete.
 841                 //        But frequently, this is used in fixture setup.
 842                 throw new MWException( "No namespace defaults to wikitext!" );
 843         }
 844
 845         /**
 846          * Check, if $wgDiff3 is set and ready to merge
 847          * Will mark the calling test as skipped, if not ready
 848          *
 849          * @since 1.21
 850          */
 851         protected function checkHasDiff3() {
 852                 global $wgDiff3;
 853
 854                 # This check may also protect against code injection in
 855                 # case of broken installations.
 856                 wfSuppressWarnings();
 857                 $haveDiff3 = $wgDiff3 && file_exists( $wgDiff3 );
 858                 wfRestoreWarnings();
 859
 860                 if( !$haveDiff3 ) {
 861                         $this->markTestSkipped( "Skip test, since diff3 is not configured" );
 862                 }
 863         }
 864
 865         /**
 866          * Check whether we have the 'gzip' commandline utility, will skip
 867          * the test whenever "gzip -V" fails.
 868          *
 869          * Result is cached at the process level.
 870          *
 871          * @return bool
 872          *
 873          * @since 1.21
 874          */
 875         protected function checkHasGzip() {
 876                 static $haveGzip;
 877
 878                 if( $haveGzip === null ) {
 879                         $retval = null;
 880                         wfShellExec( 'gzip -V', $retval );
 881                         $haveGzip = ($retval === 0);
 882                 }
 883
 884                 if( !$haveGzip ) {
 885                         $this->markTestSkipped( "Skip test, requires the gzip utility in PATH" );
 886                 }
 887
 888                 return $haveGzip;
 889         }
 890
 891         /**
 892          * Check if $extName is a loaded PHP extension, will skip the
 893          * test whenever it is not loaded.
 894          *
 895          * @since 1.21
 896          */
 897         protected function checkPHPExtension( $extName ) {
 898                 $loaded = extension_loaded( $extName );
 899                 if( ! $loaded ) {
 900                         $this->markTestSkipped( "PHP extension '$extName' is not loaded, skipping." );
 901                 }
 902                 return $loaded;
 903         }
 904
 905         /**
 906          * Asserts that an exception of the specified type occurs when running
 907          * the provided code.
 908          *
 909          * @since 1.21
 910          *
 911          * @param callable $code
 912          * @param string $expected
 913          * @param string $message
 914          */
 915         protected function assertException( $code, $expected = 'Exception', $message = '' ) {
 916                 $pokemons = null;
 917
 918                 try {
 919                         call_user_func( $code );
 920                 }
 921                 catch ( Exception $pokemons ) {
 922                         // Gotta Catch 'Em All!
 923                 }
 924
 925                 if ( $message === '' ) {
 926                         $message = 'An exception of type "' . $expected . '" should have been thrown';
 927                 }
 928
 929                 $this->assertInstanceOf( $expected, $pokemons, $message );
 930         }
 931
 932 }