tests/qunit/suites/resources/mediawiki/mediawiki.loader.test.js

   1 ( function ( mw, $ ) {
   2         QUnit.module( 'mediawiki (mw.loader)', QUnit.newMwEnvironment( {
   3                 setup: function ( assert ) {
   4                         mw.loader.store.enabled = false;
   5
   6                         // Expose for load.mock.php
   7                         mw.loader.testFail = function ( reason ) {
   8                                 assert.ok( false, reason );
   9                         };
  10                 },
  11                 teardown: function () {
  12                         mw.loader.store.enabled = false;
  13                         // Teardown for StringSet shim test
  14                         if ( this.nativeSet ) {
  15                                 window.Set = this.nativeSet;
  16                                 mw.redefineFallbacksForTest();
  17                         }
  18                         // Remove any remaining temporary statics
  19                         // exposed for cross-file mocks.
  20                         if ( 'testCallback' in mw.loader ) {
  21                                 delete mw.loader.testCallback;
  22                         }
  23                         if ( 'testFail' in mw.loader ) {
  24                                 delete mw.loader.testFail;
  25                         }
  26                 }
  27         } ) );
  28
  29         mw.loader.addSource(
  30                 'testloader',
  31                 QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/load.mock.php' )
  32         );
  33
  34         /**
  35          * The sync style load test (for @import). This is, in a way, also an open bug for
  36          * ResourceLoader ("execute js after styles are loaded"), but browsers don't offer a
  37          * way to get a callback from when a stylesheet is loaded (that is, including any
  38          * `@import` rules inside). To work around this, we'll have a little time loop to check
  39          * if the styles apply.
  40          *
  41          * Note: This test originally used new Image() and onerror to get a callback
  42          * when the url is loaded, but that is fragile since it doesn't monitor the
  43          * same request as the css @import, and Safari 4 has issues with
  44          * onerror/onload not being fired at all in weird cases like this.
  45          */
  46         function assertStyleAsync( assert, $element, prop, val, fn ) {
  47                 var styleTestStart,
  48                         el = $element.get( 0 ),
  49                         styleTestTimeout = ( QUnit.config.testTimeout || 5000 ) - 200;
  50
  51                 function isCssImportApplied() {
  52                         // Trigger reflow, repaint, redraw, whatever (cross-browser)
  53                         $element.css( 'height' );
  54                         // eslint-disable-next-line no-unused-expressions
  55                         el.innerHTML;
  56                         el.className = el.className;
  57                         // eslint-disable-next-line no-unused-expressions
  58                         document.documentElement.clientHeight;
  59
  60                         return $element.css( prop ) === val;
  61                 }
  62
  63                 function styleTestLoop() {
  64                         var styleTestSince = new Date().getTime() - styleTestStart;
  65                         // If it is passing or if we timed out, run the real test and stop the loop
  66                         if ( isCssImportApplied() || styleTestSince > styleTestTimeout ) {
  67                                 assert.equal( $element.css( prop ), val,
  68                                         'style "' + prop + ': ' + val + '" from url is applied (after ' + styleTestSince + 'ms)'
  69                                 );
  70
  71                                 if ( fn ) {
  72                                         fn();
  73                                 }
  74
  75                                 return;
  76                         }
  77                         // Otherwise, keep polling
  78                         setTimeout( styleTestLoop );
  79                 }
  80
  81                 // Start the loop
  82                 styleTestStart = new Date().getTime();
  83                 styleTestLoop();
  84         }
  85
  86         function urlStyleTest( selector, prop, val ) {
  87                 return QUnit.fixurl(
  88                         mw.config.get( 'wgScriptPath' ) +
  89                                 '/tests/qunit/data/styleTest.css.php?' +
  90                                 $.param( {
  91                                         selector: selector,
  92                                         prop: prop,
  93                                         val: val
  94                                 } )
  95                 );
  96         }
  97
  98         QUnit.test( 'Basic', function ( assert ) {
  99                 var isAwesomeDone;
 100
 101                 mw.loader.testCallback = function () {
 102                         assert.strictEqual( isAwesomeDone, undefined, 'Implementing module is.awesome: isAwesomeDone should still be undefined' );
 103                         isAwesomeDone = true;
 104                 };
 105
 106                 mw.loader.implement( 'test.callback', [ QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' ) ] );
 107
 108                 return mw.loader.using( 'test.callback', function () {
 109                         assert.strictEqual( isAwesomeDone, true, 'test.callback module should\'ve caused isAwesomeDone to be true' );
 110                 }, function () {
 111                         assert.ok( false, 'Error callback fired while loader.using "test.callback" module' );
 112                 } );
 113         } );
 114
 115         QUnit.test( 'Object method as module name', function ( assert ) {
 116                 var isAwesomeDone;
 117
 118                 mw.loader.testCallback = function () {
 119                         assert.strictEqual( isAwesomeDone, undefined, 'Implementing module hasOwnProperty: isAwesomeDone should still be undefined' );
 120                         isAwesomeDone = true;
 121                 };
 122
 123                 mw.loader.implement( 'hasOwnProperty', [ QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' ) ], {}, {} );
 124
 125                 return mw.loader.using( 'hasOwnProperty', function () {
 126                         assert.strictEqual( isAwesomeDone, true, 'hasOwnProperty module should\'ve caused isAwesomeDone to be true' );
 127                 }, function () {
 128                         assert.ok( false, 'Error callback fired while loader.using "hasOwnProperty" module' );
 129                 } );
 130         } );
 131
 132         QUnit.test( '.using( .. ) Promise', function ( assert ) {
 133                 var isAwesomeDone;
 134
 135                 mw.loader.testCallback = function () {
 136                         assert.strictEqual( isAwesomeDone, undefined, 'Implementing module is.awesome: isAwesomeDone should still be undefined' );
 137                         isAwesomeDone = true;
 138                 };
 139
 140                 mw.loader.implement( 'test.promise', [ QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' ) ] );
 141
 142                 return mw.loader.using( 'test.promise' )
 143                         .done( function () {
 144                                 assert.strictEqual( isAwesomeDone, true, 'test.promise module should\'ve caused isAwesomeDone to be true' );
 145                         } )
 146                         .fail( function () {
 147                                 assert.ok( false, 'Error callback fired while loader.using "test.promise" module' );
 148                         } );
 149         } );
 150
 151         // Covers mw.loader#sortDependencies (with native Set if available)
 152         QUnit.test( '.using() Error: Circular dependency [StringSet default]', function ( assert ) {
 153                 var done = assert.async();
 154
 155                 mw.loader.register( [
 156                         [ 'test.circle1', '0', [ 'test.circle2' ] ],
 157                         [ 'test.circle2', '0', [ 'test.circle3' ] ],
 158                         [ 'test.circle3', '0', [ 'test.circle1' ] ]
 159                 ] );
 160                 mw.loader.using( 'test.circle3' ).then(
 161                         function done() {
 162                                 assert.ok( false, 'Unexpected resolution, expected error.' );
 163                         },
 164                         function fail( e ) {
 165                                 assert.ok( /Circular/.test( String( e ) ), 'Detect circular dependency' );
 166                         }
 167                 )
 168                         .always( done );
 169         } );
 170
 171         // @covers mw.loader#sortDependencies (with fallback shim)
 172         QUnit.test( '.using() Error: Circular dependency [StringSet shim]', function ( assert ) {
 173                 var done = assert.async();
 174
 175                 if ( !window.Set ) {
 176                         assert.expect( 0 );
 177                         done();
 178                         return;
 179                 }
 180
 181                 this.nativeSet = window.Set;
 182                 window.Set = undefined;
 183                 mw.redefineFallbacksForTest();
 184
 185                 mw.loader.register( [
 186                         [ 'test.shim.circle1', '0', [ 'test.shim.circle2' ] ],
 187                         [ 'test.shim.circle2', '0', [ 'test.shim.circle3' ] ],
 188                         [ 'test.shim.circle3', '0', [ 'test.shim.circle1' ] ]
 189                 ] );
 190                 mw.loader.using( 'test.shim.circle3' ).then(
 191                         function done() {
 192                                 assert.ok( false, 'Unexpected resolution, expected error.' );
 193                         },
 194                         function fail( e ) {
 195                                 assert.ok( /Circular/.test( String( e ) ), 'Detect circular dependency' );
 196                         }
 197                 )
 198                         .always( done );
 199         } );
 200
 201         QUnit.test( '.load() - Error: Circular dependency', function ( assert ) {
 202                 var capture = [];
 203                 mw.loader.register( [
 204                         [ 'test.circleA', '0', [ 'test.circleB' ] ],
 205                         [ 'test.circleB', '0', [ 'test.circleC' ] ],
 206                         [ 'test.circleC', '0', [ 'test.circleA' ] ]
 207                 ] );
 208                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 209                         capture.push( {
 210                                 topic: topic,
 211                                 error: data.exception && data.exception.message,
 212                                 source: data.source
 213                         } );
 214                 } );
 215
 216                 mw.loader.load( 'test.circleC' );
 217                 assert.deepEqual(
 218                         [ {
 219                                 topic: 'resourceloader.exception',
 220                                 error: 'Circular reference detected: test.circleB -> test.circleC',
 221                                 source: 'resolve'
 222                         } ],
 223                         capture,
 224                         'Detect circular dependency'
 225                 );
 226         } );
 227
 228         QUnit.test( '.using() - Error: Unregistered', function ( assert ) {
 229                 var done = assert.async();
 230
 231                 mw.loader.using( 'test.using.unreg' ).then(
 232                         function done() {
 233                                 assert.ok( false, 'Unexpected resolution, expected error.' );
 234                         },
 235                         function fail( e ) {
 236                                 assert.ok( /Unknown/.test( String( e ) ), 'Detect unknown dependency' );
 237                         }
 238                 ).always( done );
 239         } );
 240
 241         QUnit.test( '.load() - Error: Unregistered', function ( assert ) {
 242                 var capture = [];
 243                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 244                         capture.push( {
 245                                 topic: topic,
 246                                 error: data.exception && data.exception.message,
 247                                 source: data.source
 248                         } );
 249                 } );
 250
 251                 mw.loader.load( 'test.load.unreg' );
 252                 assert.deepEqual(
 253                         [ {
 254                                 topic: 'resourceloader.exception',
 255                                 error: 'Unknown dependency: test.load.unreg',
 256                                 source: 'resolve'
 257                         } ],
 258                         capture
 259                 );
 260         } );
 261
 262         // Regression test for T36853
 263         QUnit.test( '.load() - Error: Missing dependency', function ( assert ) {
 264                 var capture = [];
 265                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 266                         capture.push( {
 267                                 topic: topic,
 268                                 error: data.exception && data.exception.message,
 269                                 source: data.source
 270                         } );
 271                 } );
 272
 273                 mw.loader.register( [
 274                         [ 'test.load.missingdep1', '0', [ 'test.load.missingdep2' ] ],
 275                         [ 'test.load.missingdep', '0', [ 'test.load.missingdep1' ] ]
 276                 ] );
 277                 mw.loader.load( 'test.load.missingdep' );
 278                 assert.deepEqual(
 279                         [ {
 280                                 topic: 'resourceloader.exception',
 281                                 error: 'Unknown dependency: test.load.missingdep2',
 282                                 source: 'resolve'
 283                         } ],
 284                         capture
 285                 );
 286         } );
 287
 288         QUnit.test( '.implement( styles={ "css": [text, ..] } )', function ( assert ) {
 289                 var $element = $( '<div class="mw-test-implement-a"></div>' ).appendTo( '#qunit-fixture' );
 290
 291                 assert.notEqual(
 292                         $element.css( 'float' ),
 293                         'right',
 294                         'style is clear'
 295                 );
 296
 297                 mw.loader.implement(
 298                         'test.implement.a',
 299                         function () {
 300                                 assert.equal(
 301                                         $element.css( 'float' ),
 302                                         'right',
 303                                         'style is applied'
 304                                 );
 305                         },
 306                         {
 307                                 all: '.mw-test-implement-a { float: right; }'
 308                         }
 309                 );
 310
 311                 return mw.loader.using( 'test.implement.a' );
 312         } );
 313
 314         QUnit.test( '.implement( styles={ "url": { <media>: [url, ..] } } )', function ( assert ) {
 315                 var $element1 = $( '<div class="mw-test-implement-b1"></div>' ).appendTo( '#qunit-fixture' ),
 316                         $element2 = $( '<div class="mw-test-implement-b2"></div>' ).appendTo( '#qunit-fixture' ),
 317                         $element3 = $( '<div class="mw-test-implement-b3"></div>' ).appendTo( '#qunit-fixture' ),
 318                         done = assert.async();
 319
 320                 assert.notEqual(
 321                         $element1.css( 'text-align' ),
 322                         'center',
 323                         'style is clear'
 324                 );
 325                 assert.notEqual(
 326                         $element2.css( 'float' ),
 327                         'left',
 328                         'style is clear'
 329                 );
 330                 assert.notEqual(
 331                         $element3.css( 'text-align' ),
 332                         'right',
 333                         'style is clear'
 334                 );
 335
 336                 mw.loader.implement(
 337                         'test.implement.b',
 338                         function () {
 339                                 // Note: done() must only be called when the entire test is
 340                                 // complete. So, make sure that we don't start until *both*
 341                                 // assertStyleAsync calls have completed.
 342                                 var pending = 2;
 343                                 assertStyleAsync( assert, $element2, 'float', 'left', function () {
 344                                         assert.notEqual( $element1.css( 'text-align' ), 'center', 'print style is not applied' );
 345
 346                                         pending--;
 347                                         if ( pending === 0 ) {
 348                                                 done();
 349                                         }
 350                                 } );
 351                                 assertStyleAsync( assert, $element3, 'float', 'right', function () {
 352                                         assert.notEqual( $element1.css( 'text-align' ), 'center', 'print style is not applied' );
 353
 354                                         pending--;
 355                                         if ( pending === 0 ) {
 356                                                 done();
 357                                         }
 358                                 } );
 359                         },
 360                         {
 361                                 url: {
 362                                         print: [ urlStyleTest( '.mw-test-implement-b1', 'text-align', 'center' ) ],
 363                                         screen: [
 364                                                 // T42834: Make sure it actually works with more than 1 stylesheet reference
 365                                                 urlStyleTest( '.mw-test-implement-b2', 'float', 'left' ),
 366                                                 urlStyleTest( '.mw-test-implement-b3', 'float', 'right' )
 367                                         ]
 368                                 }
 369                         }
 370                 );
 371
 372                 mw.loader.load( 'test.implement.b' );
 373         } );
 374
 375         // Backwards compatibility
 376         QUnit.test( '.implement( styles={ <media>: text } ) (back-compat)', function ( assert ) {
 377                 var $element = $( '<div class="mw-test-implement-c"></div>' ).appendTo( '#qunit-fixture' );
 378
 379                 assert.notEqual(
 380                         $element.css( 'float' ),
 381                         'right',
 382                         'style is clear'
 383                 );
 384
 385                 mw.loader.implement(
 386                         'test.implement.c',
 387                         function () {
 388                                 assert.equal(
 389                                         $element.css( 'float' ),
 390                                         'right',
 391                                         'style is applied'
 392                                 );
 393                         },
 394                         {
 395                                 all: '.mw-test-implement-c { float: right; }'
 396                         }
 397                 );
 398
 399                 return mw.loader.using( 'test.implement.c' );
 400         } );
 401
 402         // Backwards compatibility
 403         QUnit.test( '.implement( styles={ <media>: [url, ..] } ) (back-compat)', function ( assert ) {
 404                 var $element = $( '<div class="mw-test-implement-d"></div>' ).appendTo( '#qunit-fixture' ),
 405                         $element2 = $( '<div class="mw-test-implement-d2"></div>' ).appendTo( '#qunit-fixture' ),
 406                         done = assert.async();
 407
 408                 assert.notEqual(
 409                         $element.css( 'float' ),
 410                         'right',
 411                         'style is clear'
 412                 );
 413                 assert.notEqual(
 414                         $element2.css( 'text-align' ),
 415                         'center',
 416                         'style is clear'
 417                 );
 418
 419                 mw.loader.implement(
 420                         'test.implement.d',
 421                         function () {
 422                                 assertStyleAsync( assert, $element, 'float', 'right', function () {
 423                                         assert.notEqual( $element2.css( 'text-align' ), 'center', 'print style is not applied (T42500)' );
 424                                         done();
 425                                 } );
 426                         },
 427                         {
 428                                 all: [ urlStyleTest( '.mw-test-implement-d', 'float', 'right' ) ],
 429                                 print: [ urlStyleTest( '.mw-test-implement-d2', 'text-align', 'center' ) ]
 430                         }
 431                 );
 432
 433                 mw.loader.load( 'test.implement.d' );
 434         } );
 435
 436         // @import (T33676)
 437         QUnit.test( '.implement( styles has @import )', function ( assert ) {
 438                 var isJsExecuted, $element,
 439                         done = assert.async();
 440
 441                 mw.loader.implement(
 442                         'test.implement.import',
 443                         function () {
 444                                 assert.strictEqual( isJsExecuted, undefined, 'script not executed multiple times' );
 445                                 isJsExecuted = true;
 446
 447                                 assert.equal( mw.loader.getState( 'test.implement.import' ), 'executing', 'module state during implement() script execution' );
 448
 449                                 $element = $( '<div class="mw-test-implement-import">Foo bar</div>' ).appendTo( '#qunit-fixture' );
 450
 451                                 assert.equal( mw.msg( 'test-foobar' ), 'Hello Foobar, $1!', 'messages load before script execution' );
 452
 453                                 assertStyleAsync( assert, $element, 'float', 'right', function () {
 454                                         assert.equal( $element.css( 'text-align' ), 'center',
 455                                                 'CSS styles after the @import rule are working'
 456                                         );
 457
 458                                         done();
 459                                 } );
 460                         },
 461                         {
 462                                 css: [
 463                                         '@import url(\''
 464                                                 + urlStyleTest( '.mw-test-implement-import', 'float', 'right' )
 465                                                 + '\');\n'
 466                                                 + '.mw-test-implement-import { text-align: center; }'
 467                                 ]
 468                         },
 469                         {
 470                                 'test-foobar': 'Hello Foobar, $1!'
 471                         }
 472                 );
 473
 474                 mw.loader.using( 'test.implement.import' ).always( function () {
 475                         assert.strictEqual( isJsExecuted, true, 'script executed' );
 476                         assert.equal( mw.loader.getState( 'test.implement.import' ), 'ready', 'module state after script execution' );
 477                 } );
 478         } );
 479
 480         QUnit.test( '.implement( dependency with styles )', function ( assert ) {
 481                 var $element = $( '<div class="mw-test-implement-e"></div>' ).appendTo( '#qunit-fixture' ),
 482                         $element2 = $( '<div class="mw-test-implement-e2"></div>' ).appendTo( '#qunit-fixture' );
 483
 484                 assert.notEqual(
 485                         $element.css( 'float' ),
 486                         'right',
 487                         'style is clear'
 488                 );
 489                 assert.notEqual(
 490                         $element2.css( 'float' ),
 491                         'left',
 492                         'style is clear'
 493                 );
 494
 495                 mw.loader.register( [
 496                         [ 'test.implement.e', '0', [ 'test.implement.e2' ] ],
 497                         [ 'test.implement.e2', '0' ]
 498                 ] );
 499
 500                 mw.loader.implement(
 501                         'test.implement.e',
 502                         function () {
 503                                 assert.equal(
 504                                         $element.css( 'float' ),
 505                                         'right',
 506                                         'Depending module\'s style is applied'
 507                                 );
 508                         },
 509                         {
 510                                 all: '.mw-test-implement-e { float: right; }'
 511                         }
 512                 );
 513
 514                 mw.loader.implement(
 515                         'test.implement.e2',
 516                         function () {
 517                                 assert.equal(
 518                                         $element2.css( 'float' ),
 519                                         'left',
 520                                         'Dependency\'s style is applied'
 521                                 );
 522                         },
 523                         {
 524                                 all: '.mw-test-implement-e2 { float: left; }'
 525                         }
 526                 );
 527
 528                 return mw.loader.using( 'test.implement.e' );
 529         } );
 530
 531         QUnit.test( '.implement( only scripts )', function ( assert ) {
 532                 mw.loader.implement( 'test.onlyscripts', function () {} );
 533                 assert.strictEqual( mw.loader.getState( 'test.onlyscripts' ), 'ready' );
 534         } );
 535
 536         QUnit.test( '.implement( only messages )', function ( assert ) {
 537                 assert.assertFalse( mw.messages.exists( 'T31107' ), 'Verify that the test message doesn\'t exist yet' );
 538
 539                 mw.loader.implement( 'test.implement.msgs', [], {}, { T31107: 'loaded' } );
 540
 541                 return mw.loader.using( 'test.implement.msgs', function () {
 542                         assert.ok( mw.messages.exists( 'T31107' ), 'T31107: messages-only module should implement ok' );
 543                 }, function () {
 544                         assert.ok( false, 'Error callback fired while implementing "test.implement.msgs" module' );
 545                 } );
 546         } );
 547
 548         QUnit.test( '.implement( empty )', function ( assert ) {
 549                 mw.loader.implement( 'test.empty' );
 550                 assert.strictEqual( mw.loader.getState( 'test.empty' ), 'ready' );
 551         } );
 552
 553         // @covers mw.loader#batchRequest
 554         // This is a regression test because in the past we called getCombinedVersion()
 555         // for all requested modules, before url splitting took place.
 556         // Discovered as part of T188076, but not directly related.
 557         QUnit.test( 'Url composition (modules considered for version)', function ( assert ) {
 558                 mw.loader.register( [
 559                         // [module, version, dependencies, group, source]
 560                         [ 'testUrlInc', 'url', [], null, 'testloader' ],
 561                         [ 'testUrlIncDump', 'dump', [], null, 'testloader' ]
 562                 ] );
 563
 564                 mw.config.set( 'wgResourceLoaderMaxQueryLength', 10 );
 565
 566                 return mw.loader.using( [ 'testUrlIncDump', 'testUrlInc' ] ).then( function ( require ) {
 567                         assert.propEqual(
 568                                 require( 'testUrlIncDump' ).query,
 569                                 {
 570                                         modules: 'testUrlIncDump',
 571                                         // Expected: Wrapped hash just for this one module
 572                                         //   $hash = hash( 'fnv132', 'dump');
 573                                         //   base_convert( $hash, 16, 36 ); // "13e9zzn"
 574                                         // Previously: Wrapped hash for both modules, despite being in separate requests
 575                                         //   $hash = hash( 'fnv132', 'urldump' );
 576                                         //   base_convert( $hash, 16, 36 ); // "18kz9ca"
 577                                         version: '13e9zzn'
 578                                 },
 579                                 'Query parameters'
 580                         );
 581
 582                         assert.strictEqual( mw.loader.getState( 'testUrlInc' ), 'ready', 'testUrlInc also loaded' );
 583                 } );
 584         } );
 585
 586         QUnit.test( 'Broken indirect dependency', function ( assert ) {
 587                 // don't emit an error event
 588                 this.sandbox.stub( mw, 'track' );
 589
 590                 mw.loader.register( [
 591                         [ 'test.module1', '0' ],
 592                         [ 'test.module2', '0', [ 'test.module1' ] ],
 593                         [ 'test.module3', '0', [ 'test.module2' ] ]
 594                 ] );
 595                 mw.loader.implement( 'test.module1', function () {
 596                         throw new Error( 'expected' );
 597                 }, {}, {} );
 598                 assert.strictEqual( mw.loader.getState( 'test.module1' ), 'error', 'Expected "error" state for test.module1' );
 599                 assert.strictEqual( mw.loader.getState( 'test.module2' ), 'error', 'Expected "error" state for test.module2' );
 600                 assert.strictEqual( mw.loader.getState( 'test.module3' ), 'error', 'Expected "error" state for test.module3' );
 601
 602                 assert.strictEqual( mw.track.callCount, 1 );
 603         } );
 604
 605         QUnit.test( 'Out-of-order implementation', function ( assert ) {
 606                 mw.loader.register( [
 607                         [ 'test.module4', '0' ],
 608                         [ 'test.module5', '0', [ 'test.module4' ] ],
 609                         [ 'test.module6', '0', [ 'test.module5' ] ]
 610                 ] );
 611                 mw.loader.implement( 'test.module4', function () {} );
 612                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'Expected "ready" state for test.module4' );
 613                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'registered', 'Expected "registered" state for test.module5' );
 614                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'registered', 'Expected "registered" state for test.module6' );
 615                 mw.loader.implement( 'test.module6', function () {} );
 616                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'Expected "ready" state for test.module4' );
 617                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'registered', 'Expected "registered" state for test.module5' );
 618                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'loaded', 'Expected "loaded" state for test.module6' );
 619                 mw.loader.implement( 'test.module5', function () {} );
 620                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'Expected "ready" state for test.module4' );
 621                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'ready', 'Expected "ready" state for test.module5' );
 622                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'ready', 'Expected "ready" state for test.module6' );
 623         } );
 624
 625         QUnit.test( 'Missing dependency', function ( assert ) {
 626                 mw.loader.register( [
 627                         [ 'test.module7', '0' ],
 628                         [ 'test.module8', '0', [ 'test.module7' ] ],
 629                         [ 'test.module9', '0', [ 'test.module8' ] ]
 630                 ] );
 631                 mw.loader.implement( 'test.module8', function () {} );
 632                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'registered', 'Expected "registered" state for test.module7' );
 633                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'loaded', 'Expected "loaded" state for test.module8' );
 634                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'registered', 'Expected "registered" state for test.module9' );
 635                 mw.loader.state( 'test.module7', 'missing' );
 636                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'missing', 'Expected "missing" state for test.module7' );
 637                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'error', 'Expected "error" state for test.module8' );
 638                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'error', 'Expected "error" state for test.module9' );
 639                 mw.loader.implement( 'test.module9', function () {} );
 640                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'missing', 'Expected "missing" state for test.module7' );
 641                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'error', 'Expected "error" state for test.module8' );
 642                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'error', 'Expected "error" state for test.module9' );
 643                 mw.loader.using(
 644                         [ 'test.module7' ],
 645                         function () {
 646                                 assert.ok( false, 'Success fired despite missing dependency' );
 647                                 assert.ok( true, 'QUnit expected() count dummy' );
 648                         },
 649                         function ( e, dependencies ) {
 650                                 assert.strictEqual( Array.isArray( dependencies ), true, 'Expected array of dependencies' );
 651                                 assert.deepEqual( dependencies, [ 'test.module7' ], 'Error callback called with module test.module7' );
 652                         }
 653                 );
 654                 mw.loader.using(
 655                         [ 'test.module9' ],
 656                         function () {
 657                                 assert.ok( false, 'Success fired despite missing dependency' );
 658                                 assert.ok( true, 'QUnit expected() count dummy' );
 659                         },
 660                         function ( e, dependencies ) {
 661                                 assert.strictEqual( Array.isArray( dependencies ), true, 'Expected array of dependencies' );
 662                                 dependencies.sort();
 663                                 assert.deepEqual(
 664                                         dependencies,
 665                                         [ 'test.module7', 'test.module8', 'test.module9' ],
 666                                         'Error callback called with all three modules as dependencies'
 667                                 );
 668                         }
 669                 );
 670         } );
 671
 672         QUnit.test( 'Dependency handling', function ( assert ) {
 673                 var done = assert.async();
 674                 mw.loader.register( [
 675                         // [module, version, dependencies, group, source]
 676                         [ 'testMissing', '1', [], null, 'testloader' ],
 677                         [ 'testUsesMissing', '1', [ 'testMissing' ], null, 'testloader' ],
 678                         [ 'testUsesNestedMissing', '1', [ 'testUsesMissing' ], null, 'testloader' ]
 679                 ] );
 680
 681                 function verifyModuleStates() {
 682                         assert.equal( mw.loader.getState( 'testMissing' ), 'missing', 'Module not known to server must have state "missing"' );
 683                         assert.equal( mw.loader.getState( 'testUsesMissing' ), 'error', 'Module with missing dependency must have state "error"' );
 684                         assert.equal( mw.loader.getState( 'testUsesNestedMissing' ), 'error', 'Module with indirect missing dependency must have state "error"' );
 685                 }
 686
 687                 mw.loader.using( [ 'testUsesNestedMissing' ],
 688                         function () {
 689                                 assert.ok( false, 'Error handler should be invoked.' );
 690                                 assert.ok( true ); // Dummy to reach QUnit expect()
 691
 692                                 verifyModuleStates();
 693
 694                                 done();
 695                         },
 696                         function ( e, badmodules ) {
 697                                 assert.ok( true, 'Error handler should be invoked.' );
 698                                 // As soon as server spits out state('testMissing', 'missing');
 699                                 // it will bubble up and trigger the error callback.
 700                                 // Therefor the badmodules array is not testUsesMissing or testUsesNestedMissing.
 701                                 assert.deepEqual( badmodules, [ 'testMissing' ], 'Bad modules as expected.' );
 702
 703                                 verifyModuleStates();
 704
 705                                 done();
 706                         }
 707                 );
 708         } );
 709
 710         QUnit.test( 'Skip-function handling', function ( assert ) {
 711                 mw.loader.register( [
 712                         // [module, version, dependencies, group, source, skip]
 713                         [ 'testSkipped', '1', [], null, 'testloader', 'return true;' ],
 714                         [ 'testNotSkipped', '1', [], null, 'testloader', 'return false;' ],
 715                         [ 'testUsesSkippable', '1', [ 'testSkipped', 'testNotSkipped' ], null, 'testloader' ]
 716                 ] );
 717
 718                 function verifyModuleStates() {
 719                         assert.equal( mw.loader.getState( 'testSkipped' ), 'ready', 'Module is ready when skipped' );
 720                         assert.equal( mw.loader.getState( 'testNotSkipped' ), 'ready', 'Module is ready when not skipped but loaded' );
 721                         assert.equal( mw.loader.getState( 'testUsesSkippable' ), 'ready', 'Module is ready when skippable dependencies are ready' );
 722                 }
 723
 724                 return mw.loader.using( [ 'testUsesSkippable' ],
 725                         function () {
 726                                 assert.ok( true, 'Success handler should be invoked.' );
 727                                 assert.ok( true ); // Dummy to match error handler and reach QUnit expect()
 728
 729                                 verifyModuleStates();
 730                         },
 731                         function ( e, badmodules ) {
 732                                 assert.ok( false, 'Error handler should not be invoked.' );
 733                                 assert.deepEqual( badmodules, [], 'Bad modules as expected.' );
 734
 735                                 verifyModuleStates();
 736                         }
 737                 );
 738         } );
 739
 740         // This bug was actually already fixed in 1.18 and later when discovered in 1.17.
 741         QUnit.test( '.load( "//protocol-relative" ) - T32825', function ( assert ) {
 742                 var target,
 743                         done = assert.async();
 744
 745                 // URL to the callback script
 746                 target = QUnit.fixurl(
 747                         mw.config.get( 'wgServer' ) + mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js'
 748                 );
 749                 // Ensure a protocol-relative URL for this test
 750                 target = target.replace( /https?:/, '' );
 751                 assert.equal( target.slice( 0, 2 ), '//', 'URL is protocol-relative' );
 752
 753                 mw.loader.testCallback = function () {
 754                         // Ensure once, delete now
 755                         delete mw.loader.testCallback;
 756                         assert.ok( true, 'callback' );
 757                         done();
 758                 };
 759
 760                 // Go!
 761                 mw.loader.load( target );
 762         } );
 763
 764         QUnit.test( '.load( "/absolute-path" )', function ( assert ) {
 765                 var target,
 766                         done = assert.async();
 767
 768                 // URL to the callback script
 769                 target = QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' );
 770                 assert.equal( target.slice( 0, 1 ), '/', 'URL is relative to document root' );
 771
 772                 mw.loader.testCallback = function () {
 773                         // Ensure once, delete now
 774                         delete mw.loader.testCallback;
 775                         assert.ok( true, 'callback' );
 776                         done();
 777                 };
 778
 779                 // Go!
 780                 mw.loader.load( target );
 781         } );
 782
 783         QUnit.test( 'Empty string module name - T28804', function ( assert ) {
 784                 var done = false;
 785
 786                 assert.strictEqual( mw.loader.getState( '' ), null, 'State (unregistered)' );
 787
 788                 mw.loader.register( '', 'v1' );
 789                 assert.strictEqual( mw.loader.getState( '' ), 'registered', 'State (registered)' );
 790                 assert.strictEqual( mw.loader.getVersion( '' ), 'v1', 'Version' );
 791
 792                 mw.loader.implement( '', function () {
 793                         done = true;
 794                 } );
 795
 796                 return mw.loader.using( '', function () {
 797                         assert.strictEqual( done, true, 'script ran' );
 798                         assert.strictEqual( mw.loader.getState( '' ), 'ready', 'State (ready)' );
 799                 } );
 800         } );
 801
 802         QUnit.test( 'Executing race - T112232', function ( assert ) {
 803                 var done = false;
 804
 805                 // The red herring schedules its CSS buffer first. In T112232, a bug in the
 806                 // state machine would cause the job for testRaceLoadMe to run with an earlier job.
 807                 mw.loader.implement(
 808                         'testRaceRedHerring',
 809                         function () {},
 810                         { css: [ '.mw-testRaceRedHerring {}' ] }
 811                 );
 812                 mw.loader.implement(
 813                         'testRaceLoadMe',
 814                         function () {
 815                                 done = true;
 816                         },
 817                         { css: [ '.mw-testRaceLoadMe { float: left; }' ] }
 818                 );
 819
 820                 mw.loader.load( [ 'testRaceRedHerring', 'testRaceLoadMe' ] );
 821                 return mw.loader.using( 'testRaceLoadMe', function () {
 822                         assert.strictEqual( done, true, 'script ran' );
 823                         assert.strictEqual( mw.loader.getState( 'testRaceLoadMe' ), 'ready', 'state' );
 824                 } );
 825         } );
 826
 827         QUnit.test( 'Stale response caching - T117587', function ( assert ) {
 828                 var count = 0;
 829                 mw.loader.store.enabled = true;
 830                 mw.loader.register( 'test.stale', 'v2' );
 831                 assert.strictEqual( mw.loader.store.get( 'test.stale' ), false, 'Not in store' );
 832
 833                 mw.loader.implement( 'test.stale@v1', function () {
 834                         count++;
 835                 } );
 836
 837                 return mw.loader.using( 'test.stale' )
 838                         .then( function () {
 839                                 assert.strictEqual( count, 1 );
 840                                 // After implementing, registry contains version as implemented by the response.
 841                                 assert.strictEqual( mw.loader.getVersion( 'test.stale' ), 'v1', 'Override version' );
 842                                 assert.strictEqual( mw.loader.getState( 'test.stale' ), 'ready' );
 843                                 assert.ok( mw.loader.store.get( 'test.stale' ), 'In store' );
 844                         } )
 845                         .then( function () {
 846                                 // Reset run time, but keep mw.loader.store
 847                                 mw.loader.moduleRegistry[ 'test.stale' ].script = undefined;
 848                                 mw.loader.moduleRegistry[ 'test.stale' ].state = 'registered';
 849                                 mw.loader.moduleRegistry[ 'test.stale' ].version = 'v2';
 850
 851                                 // Module was stored correctly as v1
 852                                 // On future navigations, it will be ignored until evicted
 853                                 assert.strictEqual( mw.loader.store.get( 'test.stale' ), false, 'Not in store' );
 854                         } );
 855         } );
 856
 857         QUnit.test( 'Stale response caching - backcompat', function ( assert ) {
 858                 var count = 0;
 859                 mw.loader.store.enabled = true;
 860                 mw.loader.register( 'test.stalebc', 'v2' );
 861                 assert.strictEqual( mw.loader.store.get( 'test.stalebc' ), false, 'Not in store' );
 862
 863                 mw.loader.implement( 'test.stalebc', function () {
 864                         count++;
 865                 } );
 866
 867                 return mw.loader.using( 'test.stalebc' )
 868                         .then( function () {
 869                                 assert.strictEqual( count, 1 );
 870                                 assert.strictEqual( mw.loader.getState( 'test.stalebc' ), 'ready' );
 871                                 assert.ok( mw.loader.store.get( 'test.stalebc' ), 'In store' );
 872                         } )
 873                         .then( function () {
 874                                 // Reset run time, but keep mw.loader.store
 875                                 mw.loader.moduleRegistry[ 'test.stalebc' ].script = undefined;
 876                                 mw.loader.moduleRegistry[ 'test.stalebc' ].state = 'registered';
 877                                 mw.loader.moduleRegistry[ 'test.stalebc' ].version = 'v2';
 878
 879                                 // Legacy behaviour is storing under the expected version,
 880                                 // which woudl lead to whitewashing and stale values (T117587).
 881                                 assert.ok( mw.loader.store.get( 'test.stalebc' ), 'In store' );
 882                         } );
 883         } );
 884
 885         QUnit.test( 'require()', function ( assert ) {
 886                 mw.loader.register( [
 887                         [ 'test.require1', '0' ],
 888                         [ 'test.require2', '0' ],
 889                         [ 'test.require3', '0' ],
 890                         [ 'test.require4', '0', [ 'test.require3' ] ]
 891                 ] );
 892                 mw.loader.implement( 'test.require1', function () {} );
 893                 mw.loader.implement( 'test.require2', function ( $, jQuery, require, module ) {
 894                         module.exports = 1;
 895                 } );
 896                 mw.loader.implement( 'test.require3', function ( $, jQuery, require, module ) {
 897                         module.exports = function () {
 898                                 return 'hello world';
 899                         };
 900                 } );
 901                 mw.loader.implement( 'test.require4', function ( $, jQuery, require, module ) {
 902                         var other = require( 'test.require3' );
 903                         module.exports = {
 904                                 pizza: function () {
 905                                         return other();
 906                                 }
 907                         };
 908                 } );
 909                 return mw.loader.using( [ 'test.require1', 'test.require2', 'test.require3', 'test.require4' ] ).then( function ( require ) {
 910                         var module1, module2, module3, module4;
 911
 912                         module1 = require( 'test.require1' );
 913                         module2 = require( 'test.require2' );
 914                         module3 = require( 'test.require3' );
 915                         module4 = require( 'test.require4' );
 916
 917                         assert.strictEqual( typeof module1, 'object', 'export of module with no export' );
 918                         assert.strictEqual( module2, 1, 'export a number' );
 919                         assert.strictEqual( module3(), 'hello world', 'export a function' );
 920                         assert.strictEqual( typeof module4.pizza, 'function', 'export an object' );
 921                         assert.strictEqual( module4.pizza(), 'hello world', 'module can require other modules' );
 922
 923                         assert.throws( function () {
 924                                 require( '_badmodule' );
 925                         }, /is not loaded/, 'Requesting non-existent modules throws error.' );
 926                 } );
 927         } );
 928
 929         QUnit.test( 'require() in debug mode', function ( assert ) {
 930                 var path = mw.config.get( 'wgScriptPath' );
 931                 mw.loader.register( [
 932                         [ 'test.require.define', '0' ],
 933                         [ 'test.require.callback', '0', [ 'test.require.define' ] ]
 934                 ] );
 935                 mw.loader.implement( 'test.require.callback', [ QUnit.fixurl( path + '/tests/qunit/data/requireCallMwLoaderTestCallback.js' ) ] );
 936                 mw.loader.implement( 'test.require.define', [ QUnit.fixurl( path + '/tests/qunit/data/defineCallMwLoaderTestCallback.js' ) ] );
 937
 938                 return mw.loader.using( 'test.require.callback' ).then( function ( require ) {
 939                         var cb = require( 'test.require.callback' );
 940                         assert.strictEqual( cb.immediate, 'Defined.', 'module.exports and require work in debug mode' );
 941                         // Must use try-catch because cb.later() will throw if require is undefined,
 942                         // which doesn't work well inside Deferred.then() when using jQuery 1.x with QUnit
 943                         try {
 944                                 assert.strictEqual( cb.later(), 'Defined.', 'require works asynchrously in debug mode' );
 945                         } catch ( e ) {
 946                                 assert.equal( null, String( e ), 'require works asynchrously in debug mode' );
 947                         }
 948                 }, function () {
 949                         assert.ok( false, 'Error callback fired while loader.using "test.require.callback" module' );
 950                 } );
 951         } );
 952
 953         QUnit.test( 'Implicit dependencies', function ( assert ) {
 954                 var ranUser = false,
 955                         userSeesSite = false,
 956                         ranSite = false;
 957
 958                 mw.loader.implement(
 959                         'site',
 960                         function () {
 961                                 ranSite = true;
 962                         }
 963                 );
 964                 mw.loader.implement(
 965                         'user',
 966                         function () {
 967                                 userSeesSite = ranSite;
 968                                 ranUser = true;
 969                         }
 970                 );
 971
 972                 assert.strictEqual( ranSite, false, 'verify site module not yet loaded' );
 973                 assert.strictEqual( ranUser, false, 'verify user module not yet loaded' );
 974                 return mw.loader.using( 'user', function () {
 975                         assert.strictEqual( ranSite, true, 'ran site module' );
 976                         assert.strictEqual( ranUser, true, 'ran user module' );
 977                         assert.strictEqual( userSeesSite, true, 'ran site before user module' );
 978
 979                         // Reset
 980                         mw.loader.moduleRegistry[ 'site' ].state = 'registered';
 981                         mw.loader.moduleRegistry[ 'user' ].state = 'registered';
 982                 } );
 983         } );
 984
 985 }( mediaWiki, jQuery ) );