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

   1 ( function () {
   2         QUnit.module( 'mediawiki.loader', QUnit.newMwEnvironment( {
   3                 setup: function ( assert ) {
   4                         // Expose for load.mock.php
   5                         mw.loader.testFail = function ( reason ) {
   6                                 assert.ok( false, reason );
   7                         };
   8
   9                         this.useStubClock = function () {
  10                                 this.clock = this.sandbox.useFakeTimers();
  11                                 this.tick = function ( forward ) {
  12                                         return this.clock.tick( forward || 1 );
  13                                 };
  14                                 this.sandbox.stub( mw, 'requestIdleCallback', mw.requestIdleCallbackInternal );
  15                         };
  16                 },
  17                 teardown: function () {
  18                         mw.loader.maxQueryLength = 2000;
  19                         // Teardown for StringSet shim test
  20                         if ( this.nativeSet ) {
  21                                 window.Set = this.nativeSet;
  22                                 mw.redefineFallbacksForTest();
  23                         }
  24                         if ( this.resetStoreKey ) {
  25                                 localStorage.removeItem( mw.loader.store.key );
  26                         }
  27                         // Remove any remaining temporary statics
  28                         // exposed for cross-file mocks.
  29                         delete mw.loader.testCallback;
  30                         delete mw.loader.testFail;
  31                         delete mw.getScriptExampleScriptLoaded;
  32                 }
  33         } ) );
  34
  35         mw.loader.addSource( {
  36                 testloader:
  37                         QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/load.mock.php' )
  38         } );
  39
  40         /**
  41          * The sync style load test, for @import. This is, in a way, also an open bug for
  42          * ResourceLoader ("execute js after styles are loaded"), but browsers don't offer a
  43          * way to get a callback from when a stylesheet is loaded (that is, including any
  44          * `@import` rules inside). To work around this, we'll have a little time loop to check
  45          * if the styles apply.
  46          *
  47          * Note: This test originally used new Image() and onerror to get a callback
  48          * when the url is loaded, but that is fragile since it doesn't monitor the
  49          * same request as the css @import, and Safari 4 has issues with
  50          * onerror/onload not being fired at all in weird cases like this.
  51          */
  52         function assertStyleAsync( assert, $element, prop, val, fn ) {
  53                 var styleTestStart,
  54                         el = $element.get( 0 ),
  55                         styleTestTimeout = ( QUnit.config.testTimeout || 5000 ) - 200;
  56
  57                 function isCssImportApplied() {
  58                         // Trigger reflow, repaint, redraw, whatever (cross-browser)
  59                         $element.css( 'height' );
  60                         // eslint-disable-next-line no-unused-expressions
  61                         el.innerHTML;
  62                         // eslint-disable-next-line no-self-assign
  63                         el.className = el.className;
  64                         // eslint-disable-next-line no-unused-expressions
  65                         document.documentElement.clientHeight;
  66
  67                         return $element.css( prop ) === val;
  68                 }
  69
  70                 function styleTestLoop() {
  71                         var styleTestSince = new Date().getTime() - styleTestStart;
  72                         // If it is passing or if we timed out, run the real test and stop the loop
  73                         if ( isCssImportApplied() || styleTestSince > styleTestTimeout ) {
  74                                 assert.strictEqual( $element.css( prop ), val,
  75                                         'style "' + prop + ': ' + val + '" from url is applied (after ' + styleTestSince + 'ms)'
  76                                 );
  77
  78                                 if ( fn ) {
  79                                         fn();
  80                                 }
  81
  82                                 return;
  83                         }
  84                         // Otherwise, keep polling
  85                         setTimeout( styleTestLoop );
  86                 }
  87
  88                 // Start the loop
  89                 styleTestStart = new Date().getTime();
  90                 styleTestLoop();
  91         }
  92
  93         function urlStyleTest( selector, prop, val ) {
  94                 return QUnit.fixurl(
  95                         mw.config.get( 'wgScriptPath' ) +
  96                                 '/tests/qunit/data/styleTest.css.php?' +
  97                                 $.param( {
  98                                         selector: selector,
  99                                         prop: prop,
 100                                         val: val
 101                                 } )
 102                 );
 103         }
 104
 105         QUnit.test( '.using( .., Function callback ) Promise', function ( assert ) {
 106                 var script = 0, callback = 0;
 107                 mw.loader.testCallback = function () {
 108                         script++;
 109                 };
 110                 mw.loader.implement( 'test.promise', [ QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' ) ] );
 111
 112                 return mw.loader.using( 'test.promise', function () {
 113                         callback++;
 114                 } ).then( function () {
 115                         assert.strictEqual( script, 1, 'module script ran' );
 116                         assert.strictEqual( callback, 1, 'using() callback ran' );
 117                 } );
 118         } );
 119
 120         QUnit.test( 'Prototype method as module name', function ( assert ) {
 121                 var call = 0;
 122                 mw.loader.testCallback = function () {
 123                         call++;
 124                 };
 125                 mw.loader.implement( 'hasOwnProperty', [ QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' ) ], {}, {} );
 126
 127                 return mw.loader.using( 'hasOwnProperty', function () {
 128                         assert.strictEqual( call, 1, 'module script ran' );
 129                 } );
 130         } );
 131
 132         // Covers mw.loader#sortDependencies (with native Set if available)
 133         QUnit.test( '.using() - Error: Circular dependency [StringSet default]', function ( assert ) {
 134                 var done = assert.async();
 135
 136                 mw.loader.register( [
 137                         [ 'test.set.circleA', '0', [ 'test.set.circleB' ] ],
 138                         [ 'test.set.circleB', '0', [ 'test.set.circleC' ] ],
 139                         [ 'test.set.circleC', '0', [ 'test.set.circleA' ] ]
 140                 ] );
 141                 mw.loader.using( 'test.set.circleC' ).then(
 142                         function done() {
 143                                 assert.ok( false, 'Unexpected resolution, expected error.' );
 144                         },
 145                         function fail( e ) {
 146                                 assert.ok( /Circular/.test( String( e ) ), 'Detect circular dependency' );
 147                         }
 148                 )
 149                         .always( done );
 150         } );
 151
 152         // @covers mw.loader#sortDependencies (with fallback shim)
 153         QUnit.test( '.using() - Error: Circular dependency [StringSet shim]', function ( assert ) {
 154                 var done = assert.async();
 155
 156                 if ( !window.Set ) {
 157                         assert.expect( 0 );
 158                         done();
 159                         return;
 160                 }
 161
 162                 this.nativeSet = window.Set;
 163                 window.Set = undefined;
 164                 mw.redefineFallbacksForTest();
 165
 166                 mw.loader.register( [
 167                         [ 'test.shim.circleA', '0', [ 'test.shim.circleB' ] ],
 168                         [ 'test.shim.circleB', '0', [ 'test.shim.circleC' ] ],
 169                         [ 'test.shim.circleC', '0', [ 'test.shim.circleA' ] ]
 170                 ] );
 171                 mw.loader.using( 'test.shim.circleC' ).then(
 172                         function done() {
 173                                 assert.ok( false, 'Unexpected resolution, expected error.' );
 174                         },
 175                         function fail( e ) {
 176                                 assert.ok( /Circular/.test( String( e ) ), 'Detect circular dependency' );
 177                         }
 178                 )
 179                         .always( done );
 180         } );
 181
 182         QUnit.test( '.load() - Error: Circular dependency', function ( assert ) {
 183                 var capture = [];
 184                 mw.loader.register( [
 185                         [ 'test.load.circleA', '0', [ 'test.load.circleB' ] ],
 186                         [ 'test.load.circleB', '0', [ 'test.load.circleC' ] ],
 187                         [ 'test.load.circleC', '0', [ 'test.load.circleA' ] ]
 188                 ] );
 189                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 190                         capture.push( {
 191                                 topic: topic,
 192                                 error: data.exception && data.exception.message,
 193                                 source: data.source
 194                         } );
 195                 } );
 196
 197                 mw.loader.load( 'test.load.circleC' );
 198                 assert.deepEqual(
 199                         [ {
 200                                 topic: 'resourceloader.exception',
 201                                 error: 'Circular reference detected: test.load.circleB -> test.load.circleC',
 202                                 source: 'resolve'
 203                         } ],
 204                         capture,
 205                         'Detect circular dependency'
 206                 );
 207         } );
 208
 209         QUnit.test( '.load() - Error: Circular dependency (direct)', function ( assert ) {
 210                 var capture = [];
 211                 mw.loader.register( [
 212                         [ 'test.load.circleDirect', '0', [ 'test.load.circleDirect' ] ]
 213                 ] );
 214                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 215                         capture.push( {
 216                                 topic: topic,
 217                                 error: data.exception && data.exception.message,
 218                                 source: data.source
 219                         } );
 220                 } );
 221
 222                 mw.loader.load( 'test.load.circleDirect' );
 223                 assert.deepEqual(
 224                         [ {
 225                                 topic: 'resourceloader.exception',
 226                                 error: 'Circular reference detected: test.load.circleDirect -> test.load.circleDirect',
 227                                 source: 'resolve'
 228                         } ],
 229                         capture,
 230                         'Detect a direct self-dependency'
 231                 );
 232         } );
 233
 234         QUnit.test( '.using() - Error: Unregistered', function ( assert ) {
 235                 var done = assert.async();
 236
 237                 mw.loader.using( 'test.using.unreg' ).then(
 238                         function done() {
 239                                 assert.ok( false, 'Unexpected resolution, expected error.' );
 240                         },
 241                         function fail( e ) {
 242                                 assert.ok( /Unknown/.test( String( e ) ), 'Detect unknown dependency' );
 243                         }
 244                 ).always( done );
 245         } );
 246
 247         QUnit.test( '.load() - Error: Unregistered', function ( assert ) {
 248                 var capture = [];
 249                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 250                         capture.push( {
 251                                 topic: topic,
 252                                 error: data.exception && data.exception.message,
 253                                 source: data.source
 254                         } );
 255                 } );
 256
 257                 mw.loader.load( 'test.load.unreg' );
 258                 assert.deepEqual(
 259                         [ {
 260                                 topic: 'resourceloader.exception',
 261                                 error: 'Unknown module: test.load.unreg',
 262                                 source: 'resolve'
 263                         } ],
 264                         capture
 265                 );
 266         } );
 267
 268         // Regression test for T36853
 269         QUnit.test( '.load() - Error: Missing dependency', function ( assert ) {
 270                 var capture = [];
 271                 this.sandbox.stub( mw, 'track', function ( topic, data ) {
 272                         capture.push( {
 273                                 topic: topic,
 274                                 error: data.exception && data.exception.message,
 275                                 source: data.source
 276                         } );
 277                 } );
 278
 279                 mw.loader.register( [
 280                         [ 'test.load.missingdep1', '0', [ 'test.load.missingdep2' ] ],
 281                         [ 'test.load.missingdep', '0', [ 'test.load.missingdep1' ] ]
 282                 ] );
 283                 mw.loader.load( 'test.load.missingdep' );
 284                 assert.deepEqual(
 285                         [ {
 286                                 topic: 'resourceloader.exception',
 287                                 error: 'Unknown module: test.load.missingdep2',
 288                                 source: 'resolve'
 289                         } ],
 290                         capture
 291                 );
 292         } );
 293
 294         QUnit.test( '.implement( styles={ "css": [text, ..] } )', function ( assert ) {
 295                 var $element = $( '<div class="mw-test-implement-a"></div>' ).appendTo( '#qunit-fixture' );
 296
 297                 assert.notEqual(
 298                         $element.css( 'float' ),
 299                         'right',
 300                         'style is clear'
 301                 );
 302
 303                 mw.loader.implement(
 304                         'test.implement.a',
 305                         function () {
 306                                 assert.strictEqual(
 307                                         $element.css( 'float' ),
 308                                         'right',
 309                                         'style is applied'
 310                                 );
 311                         },
 312                         {
 313                                 all: '.mw-test-implement-a { float: right; }'
 314                         }
 315                 );
 316
 317                 return mw.loader.using( 'test.implement.a' );
 318         } );
 319
 320         QUnit.test( '.implement( styles={ "url": { <media>: [url, ..] } } )', function ( assert ) {
 321                 var $element1 = $( '<div class="mw-test-implement-b1"></div>' ).appendTo( '#qunit-fixture' ),
 322                         $element2 = $( '<div class="mw-test-implement-b2"></div>' ).appendTo( '#qunit-fixture' ),
 323                         $element3 = $( '<div class="mw-test-implement-b3"></div>' ).appendTo( '#qunit-fixture' ),
 324                         done = assert.async();
 325
 326                 assert.notEqual(
 327                         $element1.css( 'text-align' ),
 328                         'center',
 329                         'style is clear'
 330                 );
 331                 assert.notEqual(
 332                         $element2.css( 'float' ),
 333                         'left',
 334                         'style is clear'
 335                 );
 336                 assert.notEqual(
 337                         $element3.css( 'text-align' ),
 338                         'right',
 339                         'style is clear'
 340                 );
 341
 342                 mw.loader.implement(
 343                         'test.implement.b',
 344                         function () {
 345                                 // Note: done() must only be called when the entire test is
 346                                 // complete. So, make sure that we don't start until *both*
 347                                 // assertStyleAsync calls have completed.
 348                                 var pending = 2;
 349                                 assertStyleAsync( assert, $element2, 'float', 'left', function () {
 350                                         assert.notEqual( $element1.css( 'text-align' ), 'center', 'print style is not applied' );
 351
 352                                         pending--;
 353                                         if ( pending === 0 ) {
 354                                                 done();
 355                                         }
 356                                 } );
 357                                 assertStyleAsync( assert, $element3, 'float', 'right', function () {
 358                                         assert.notEqual( $element1.css( 'text-align' ), 'center', 'print style is not applied' );
 359
 360                                         pending--;
 361                                         if ( pending === 0 ) {
 362                                                 done();
 363                                         }
 364                                 } );
 365                         },
 366                         {
 367                                 url: {
 368                                         print: [ urlStyleTest( '.mw-test-implement-b1', 'text-align', 'center' ) ],
 369                                         screen: [
 370                                                 // T42834: Make sure it actually works with more than 1 stylesheet reference
 371                                                 urlStyleTest( '.mw-test-implement-b2', 'float', 'left' ),
 372                                                 urlStyleTest( '.mw-test-implement-b3', 'float', 'right' )
 373                                         ]
 374                                 }
 375                         }
 376                 );
 377
 378                 mw.loader.load( 'test.implement.b' );
 379         } );
 380
 381         // Backwards compatibility
 382         QUnit.test( '.implement( styles={ <media>: text } ) (back-compat)', function ( assert ) {
 383                 var $element = $( '<div class="mw-test-implement-c"></div>' ).appendTo( '#qunit-fixture' );
 384
 385                 assert.notEqual(
 386                         $element.css( 'float' ),
 387                         'right',
 388                         'style is clear'
 389                 );
 390
 391                 mw.loader.implement(
 392                         'test.implement.c',
 393                         function () {
 394                                 assert.strictEqual(
 395                                         $element.css( 'float' ),
 396                                         'right',
 397                                         'style is applied'
 398                                 );
 399                         },
 400                         {
 401                                 all: '.mw-test-implement-c { float: right; }'
 402                         }
 403                 );
 404
 405                 return mw.loader.using( 'test.implement.c' );
 406         } );
 407
 408         // Backwards compatibility
 409         QUnit.test( '.implement( styles={ <media>: [url, ..] } ) (back-compat)', function ( assert ) {
 410                 var $element = $( '<div class="mw-test-implement-d"></div>' ).appendTo( '#qunit-fixture' ),
 411                         $element2 = $( '<div class="mw-test-implement-d2"></div>' ).appendTo( '#qunit-fixture' ),
 412                         done = assert.async();
 413
 414                 assert.notEqual(
 415                         $element.css( 'float' ),
 416                         'right',
 417                         'style is clear'
 418                 );
 419                 assert.notEqual(
 420                         $element2.css( 'text-align' ),
 421                         'center',
 422                         'style is clear'
 423                 );
 424
 425                 mw.loader.implement(
 426                         'test.implement.d',
 427                         function () {
 428                                 assertStyleAsync( assert, $element, 'float', 'right', function () {
 429                                         assert.notEqual( $element2.css( 'text-align' ), 'center', 'print style is not applied (T42500)' );
 430                                         done();
 431                                 } );
 432                         },
 433                         {
 434                                 all: [ urlStyleTest( '.mw-test-implement-d', 'float', 'right' ) ],
 435                                 print: [ urlStyleTest( '.mw-test-implement-d2', 'text-align', 'center' ) ]
 436                         }
 437                 );
 438
 439                 mw.loader.load( 'test.implement.d' );
 440         } );
 441
 442         QUnit.test( '.implement( messages before script )', function ( assert ) {
 443                 mw.loader.implement(
 444                         'test.implement.order',
 445                         function () {
 446                                 assert.strictEqual( mw.loader.getState( 'test.implement.order' ), 'executing', 'state during script execution' );
 447                                 assert.strictEqual( mw.msg( 'test-foobar' ), 'Hello Foobar, $1!', 'messages load before script execution' );
 448                         },
 449                         {},
 450                         {
 451                                 'test-foobar': 'Hello Foobar, $1!'
 452                         }
 453                 );
 454
 455                 return mw.loader.using( 'test.implement.order' ).then( function () {
 456                         assert.strictEqual( mw.loader.getState( 'test.implement.order' ), 'ready', 'final success state' );
 457                 } );
 458         } );
 459
 460         // @import (T33676)
 461         QUnit.test( '.implement( styles with @import )', function ( assert ) {
 462                 var $element,
 463                         done = assert.async();
 464
 465                 mw.loader.implement(
 466                         'test.implement.import',
 467                         function () {
 468                                 $element = $( '<div class="mw-test-implement-import">Foo bar</div>' ).appendTo( '#qunit-fixture' );
 469
 470                                 assertStyleAsync( assert, $element, 'float', 'right', function () {
 471                                         assert.strictEqual( $element.css( 'text-align' ), 'center',
 472                                                 'CSS styles after the @import rule are working'
 473                                         );
 474
 475                                         done();
 476                                 } );
 477                         },
 478                         {
 479                                 css: [
 480                                         '@import url(\''
 481                                                 + urlStyleTest( '.mw-test-implement-import', 'float', 'right' )
 482                                                 + '\');\n'
 483                                                 + '.mw-test-implement-import { text-align: center; }'
 484                                 ]
 485                         }
 486                 );
 487
 488                 return mw.loader.using( 'test.implement.import' );
 489         } );
 490
 491         QUnit.test( '.implement( dependency with styles )', function ( assert ) {
 492                 var $element = $( '<div class="mw-test-implement-e"></div>' ).appendTo( '#qunit-fixture' ),
 493                         $element2 = $( '<div class="mw-test-implement-e2"></div>' ).appendTo( '#qunit-fixture' );
 494
 495                 assert.notEqual(
 496                         $element.css( 'float' ),
 497                         'right',
 498                         'style is clear'
 499                 );
 500                 assert.notEqual(
 501                         $element2.css( 'float' ),
 502                         'left',
 503                         'style is clear'
 504                 );
 505
 506                 mw.loader.register( [
 507                         [ 'test.implement.e', '0', [ 'test.implement.e2' ] ],
 508                         [ 'test.implement.e2', '0' ]
 509                 ] );
 510
 511                 mw.loader.implement(
 512                         'test.implement.e',
 513                         function () {
 514                                 assert.strictEqual(
 515                                         $element.css( 'float' ),
 516                                         'right',
 517                                         'Depending module\'s style is applied'
 518                                 );
 519                         },
 520                         {
 521                                 all: '.mw-test-implement-e { float: right; }'
 522                         }
 523                 );
 524
 525                 mw.loader.implement(
 526                         'test.implement.e2',
 527                         function () {
 528                                 assert.strictEqual(
 529                                         $element2.css( 'float' ),
 530                                         'left',
 531                                         'Dependency\'s style is applied'
 532                                 );
 533                         },
 534                         {
 535                                 all: '.mw-test-implement-e2 { float: left; }'
 536                         }
 537                 );
 538
 539                 return mw.loader.using( 'test.implement.e' );
 540         } );
 541
 542         QUnit.test( '.implement( only scripts )', function ( assert ) {
 543                 mw.loader.implement( 'test.onlyscripts', function () {} );
 544                 return mw.loader.using( 'test.onlyscripts', function () {
 545                         assert.strictEqual( mw.loader.getState( 'test.onlyscripts' ), 'ready' );
 546                 } );
 547         } );
 548
 549         QUnit.test( '.implement( only messages )', function ( assert ) {
 550                 assert.assertFalse( mw.messages.exists( 'T31107' ), 'Verify that the test message doesn\'t exist yet' );
 551
 552                 mw.loader.implement( 'test.implement.msgs', [], {}, { T31107: 'loaded' } );
 553
 554                 return mw.loader.using( 'test.implement.msgs', function () {
 555                         assert.ok( mw.messages.exists( 'T31107' ), 'T31107: messages-only module should implement ok' );
 556                 } );
 557         } );
 558
 559         QUnit.test( '.implement( empty )', function ( assert ) {
 560                 mw.loader.implement( 'test.empty' );
 561                 return mw.loader.using( 'test.empty', function () {
 562                         assert.strictEqual( mw.loader.getState( 'test.empty' ), 'ready' );
 563                 } );
 564         } );
 565
 566         QUnit.test( '.implement( package files )', function ( assert ) {
 567                 var done = assert.async(),
 568                         initJsRan = false,
 569                         counter = 41;
 570                 mw.loader.implement(
 571                         'test.implement.packageFiles',
 572                         {
 573                                 main: 'resources/src/foo/init.js',
 574                                 files: {
 575                                         'resources/src/foo/data/hello.json': { hello: 'world' },
 576                                         'resources/src/foo/foo.js': function ( require, module ) {
 577                                                 counter++;
 578                                                 module.exports = { answer: counter };
 579                                         },
 580                                         'resources/src/bar/bar.js': function ( require, module ) {
 581                                                 var core = require( './core.js' );
 582                                                 module.exports = { data: core.sayHello( 'Alice' ) };
 583                                         },
 584                                         'resources/src/bar/core.js': function ( require, module ) {
 585                                                 module.exports = { sayHello: function ( name ) {
 586                                                         return 'Hello ' + name;
 587                                                 } };
 588                                         },
 589                                         'resources/src/foo/init.js': function ( require ) {
 590                                                 initJsRan = true;
 591                                                 assert.deepEqual( require( './data/hello.json' ), { hello: 'world' }, 'require() with .json file' );
 592                                                 assert.deepEqual( require( './foo.js' ), { answer: 42 }, 'require() with .js file in same directory' );
 593                                                 assert.deepEqual( require( '../bar/bar.js' ), { data: 'Hello Alice' }, 'require() with ../ of a file that uses same-directory require()' );
 594                                                 assert.deepEqual( require( './foo.js' ), { answer: 42 }, 'require()ing the same script twice only runs it once' );
 595                                         }
 596                                 }
 597                         },
 598                         {},
 599                         {},
 600                         {}
 601                 );
 602                 mw.loader.using( 'test.implement.packageFiles' ).done( function () {
 603                         assert.ok( initJsRan, 'main JS file is executed' );
 604                         done();
 605                 } );
 606         } );
 607
 608         QUnit.test( '.addSource()', function ( assert ) {
 609                 mw.loader.addSource( { testsource1: 'https://1.test/src' } );
 610
 611                 assert.throws( function () {
 612                         mw.loader.addSource( { testsource1: 'https://1.test/src' } );
 613                 }, /already registered/, 'duplicate pair from addSource(Object)' );
 614
 615                 assert.throws( function () {
 616                         mw.loader.addSource( { testsource1: 'https://1.test/src-diff' } );
 617                 }, /already registered/, 'duplicate ID from addSource(Object)' );
 618         } );
 619
 620         // @covers mw.loader#batchRequest
 621         // This is a regression test because in the past we called getCombinedVersion()
 622         // for all requested modules, before url splitting took place.
 623         // Discovered as part of T188076, but not directly related.
 624         QUnit.test( 'Url composition (modules considered for version)', function ( assert ) {
 625                 mw.loader.register( [
 626                         // [module, version, dependencies, group, source]
 627                         [ 'testUrlInc', 'url', [], null, 'testloader' ],
 628                         [ 'testUrlIncDump', 'dump', [], null, 'testloader' ]
 629                 ] );
 630
 631                 mw.loader.maxQueryLength = 10;
 632
 633                 return mw.loader.using( [ 'testUrlIncDump', 'testUrlInc' ] ).then( function ( require ) {
 634                         assert.propEqual(
 635                                 require( 'testUrlIncDump' ).query,
 636                                 {
 637                                         modules: 'testUrlIncDump',
 638                                         // Expected: Combine hashes only for the module in the specific HTTP request
 639                                         //   hash fnv132 => "13e9zzn"
 640                                         // Wrong: Combine hashes for all requested modules, before request-splitting
 641                                         //   hash fnv132 => "18kz9ca"
 642                                         version: '13e9z'
 643                                 },
 644                                 'Query parameters'
 645                         );
 646
 647                         assert.strictEqual( mw.loader.getState( 'testUrlInc' ), 'ready', 'testUrlInc also loaded' );
 648                 } );
 649         } );
 650
 651         // @covers mw.loader#batchRequest
 652         // @covers mw.loader#buildModulesString
 653         QUnit.test( 'Url composition (order of modules for version) – T188076', function ( assert ) {
 654                 mw.loader.register( [
 655                         // [module, version, dependencies, group, source]
 656                         [ 'testUrlOrder', 'url', [], null, 'testloader' ],
 657                         [ 'testUrlOrder.a', '1', [], null, 'testloader' ],
 658                         [ 'testUrlOrder.b', '2', [], null, 'testloader' ],
 659                         [ 'testUrlOrderDump', 'dump', [], null, 'testloader' ]
 660                 ] );
 661
 662                 return mw.loader.using( [
 663                         'testUrlOrderDump',
 664                         'testUrlOrder.b',
 665                         'testUrlOrder.a',
 666                         'testUrlOrder'
 667                 ] ).then( function ( require ) {
 668                         assert.propEqual(
 669                                 require( 'testUrlOrderDump' ).query,
 670                                 {
 671                                         modules: 'testUrlOrder,testUrlOrderDump|testUrlOrder.a,b',
 672                                         // Expected: Combined by sorting names after string packing
 673                                         //   hash fnv132 = "1knqzan"
 674                                         // Wrong: Combined by sorting names before string packing
 675                                         //   hash fnv132 => "11eo3in"
 676                                         version: '1knqz'
 677                                 },
 678                                 'Query parameters'
 679                         );
 680                 } );
 681         } );
 682
 683         QUnit.test( 'Broken indirect dependency', function ( assert ) {
 684                 this.useStubClock();
 685
 686                 // Don't actually emit an error event
 687                 this.sandbox.stub( mw, 'track' );
 688
 689                 mw.loader.register( [
 690                         [ 'test.module1', '0' ],
 691                         [ 'test.module2', '0', [ 'test.module1' ] ],
 692                         [ 'test.module3', '0', [ 'test.module2' ] ]
 693                 ] );
 694                 mw.loader.implement( 'test.module1', function () {
 695                         throw new Error( 'expected' );
 696                 }, {}, {} );
 697                 this.tick();
 698
 699                 assert.strictEqual( mw.loader.getState( 'test.module1' ), 'error', 'Expected "error" state for test.module1' );
 700                 assert.strictEqual( mw.loader.getState( 'test.module2' ), 'error', 'Expected "error" state for test.module2' );
 701                 assert.strictEqual( mw.loader.getState( 'test.module3' ), 'error', 'Expected "error" state for test.module3' );
 702
 703                 assert.strictEqual( mw.track.callCount, 1 );
 704         } );
 705
 706         QUnit.test( 'Out-of-order implementation', function ( assert ) {
 707                 this.useStubClock();
 708
 709                 mw.loader.register( [
 710                         [ 'test.module4', '0' ],
 711                         [ 'test.module5', '0', [ 'test.module4' ] ],
 712                         [ 'test.module6', '0', [ 'test.module5' ] ]
 713                 ] );
 714
 715                 mw.loader.implement( 'test.module4', function () {} );
 716                 this.tick();
 717                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'Expected "ready" state for test.module4' );
 718                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'registered', 'Expected "registered" state for test.module5' );
 719                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'registered', 'Expected "registered" state for test.module6' );
 720
 721                 mw.loader.implement( 'test.module6', function () {} );
 722                 this.tick();
 723                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'Expected "ready" state for test.module4' );
 724                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'registered', 'Expected "registered" state for test.module5' );
 725                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'loaded', 'Expected "loaded" state for test.module6' );
 726
 727                 mw.loader.implement( 'test.module5', function () {} );
 728                 this.tick();
 729                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'Expected "ready" state for test.module4' );
 730                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'ready', 'Expected "ready" state for test.module5' );
 731                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'ready', 'Expected "ready" state for test.module6' );
 732         } );
 733
 734         QUnit.test( 'Missing dependency', function ( assert ) {
 735                 this.useStubClock();
 736
 737                 mw.loader.register( [
 738                         [ 'test.module7', '0' ],
 739                         [ 'test.module8', '0', [ 'test.module7' ] ],
 740                         [ 'test.module9', '0', [ 'test.module8' ] ]
 741                 ] );
 742
 743                 mw.loader.implement( 'test.module8', function () {} );
 744                 this.tick();
 745                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'registered', 'Expected "registered" state for test.module7' );
 746                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'loaded', 'Expected "loaded" state for test.module8' );
 747                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'registered', 'Expected "registered" state for test.module9' );
 748
 749                 mw.loader.state( { 'test.module7': 'missing' } );
 750                 this.tick();
 751                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'missing', 'Expected "missing" state for test.module7' );
 752                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'error', 'Expected "error" state for test.module8' );
 753                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'error', 'Expected "error" state for test.module9' );
 754
 755                 mw.loader.implement( 'test.module9', function () {} );
 756                 this.tick();
 757                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'missing', 'Expected "missing" state for test.module7' );
 758                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'error', 'Expected "error" state for test.module8' );
 759                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'error', 'Expected "error" state for test.module9' );
 760
 761                 // Restore clock for QUnit and $.Deferred internals
 762                 this.clock.restore();
 763                 return mw.loader.using( [ 'test.module7' ] ).then(
 764                         function () {
 765                                 throw new Error( 'Success fired despite missing dependency' );
 766                         },
 767                         function ( e, dependencies ) {
 768                                 assert.strictEqual( Array.isArray( dependencies ), true, 'Expected array of dependencies' );
 769                                 assert.deepEqual(
 770                                         dependencies,
 771                                         [ 'jquery', 'mediawiki.base', 'test.module7' ],
 772                                         'Error callback called with module test.module7'
 773                                 );
 774                         }
 775                 ).then( function () {
 776                         return mw.loader.using( [ 'test.module9' ] );
 777                 } ).then(
 778                         function () {
 779                                 throw new Error( 'Success fired despite missing dependency' );
 780                         },
 781                         function ( e, dependencies ) {
 782                                 assert.strictEqual( Array.isArray( dependencies ), true, 'Expected array of dependencies' );
 783                                 dependencies.sort();
 784                                 assert.deepEqual(
 785                                         dependencies,
 786                                         [ 'jquery', 'mediawiki.base', 'test.module7', 'test.module8', 'test.module9' ],
 787                                         'Error callback called with all three modules as dependencies'
 788                                 );
 789                         }
 790                 );
 791         } );
 792
 793         QUnit.test( 'Dependency handling', function ( assert ) {
 794                 mw.loader.register( [
 795                         // [module, version, dependencies, group, source]
 796                         [ 'testMissing', '1', [], null, 'testloader' ],
 797                         [ 'testUsesMissing', '1', [ 'testMissing' ], null, 'testloader' ],
 798                         [ 'testUsesNestedMissing', '1', [ 'testUsesMissing' ], null, 'testloader' ]
 799                 ] );
 800
 801                 function verifyModuleStates() {
 802                         assert.strictEqual( mw.loader.getState( 'testMissing' ), 'missing', 'Module "testMissing" state' );
 803                         assert.strictEqual( mw.loader.getState( 'testUsesMissing' ), 'error', 'Module "testUsesMissing" state' );
 804                         assert.strictEqual( mw.loader.getState( 'testUsesNestedMissing' ), 'error', 'Module "testUsesNestedMissing" state' );
 805                 }
 806
 807                 return mw.loader.using( [ 'testUsesNestedMissing' ] ).then(
 808                         function () {
 809                                 verifyModuleStates();
 810                                 throw new Error( 'Error handler should be invoked.' );
 811                         },
 812                         function ( e, modules ) {
 813                                 // When the server sets state of 'testMissing' to 'missing'
 814                                 // it should bubble up and trigger the error callback of the job for 'testUsesNestedMissing'.
 815                                 assert.strictEqual( modules.indexOf( 'testMissing' ) !== -1, true, 'Triggered by testMissing.' );
 816
 817                                 verifyModuleStates();
 818                         }
 819                 );
 820         } );
 821
 822         QUnit.test( 'Skip-function handling', function ( assert ) {
 823                 mw.loader.register( [
 824                         // [module, version, dependencies, group, source, skip]
 825                         [ 'testSkipped', '1', [], null, 'testloader', 'return true;' ],
 826                         [ 'testNotSkipped', '1', [], null, 'testloader', 'return false;' ],
 827                         [ 'testUsesSkippable', '1', [ 'testSkipped', 'testNotSkipped' ], null, 'testloader' ]
 828                 ] );
 829
 830                 return mw.loader.using( [ 'testUsesSkippable' ] ).then(
 831                         function () {
 832                                 assert.strictEqual( mw.loader.getState( 'testSkipped' ), 'ready', 'Skipped module' );
 833                                 assert.strictEqual( mw.loader.getState( 'testNotSkipped' ), 'ready', 'Regular module' );
 834                                 assert.strictEqual( mw.loader.getState( 'testUsesSkippable' ), 'ready', 'Regular module with skippable dependency' );
 835                         },
 836                         function ( e, badmodules ) {
 837                                 // Should not fail and QUnit would already catch this,
 838                                 // but add a handler anyway to report details from 'badmodules
 839                                 assert.deepEqual( badmodules, [], 'Bad modules' );
 840                         }
 841                 );
 842         } );
 843
 844         // This bug was actually already fixed in 1.18 and later when discovered in 1.17.
 845         QUnit.test( '.load( "//protocol-relative" ) - T32825', function ( assert ) {
 846                 var target,
 847                         done = assert.async();
 848
 849                 // URL to the callback script
 850                 target = QUnit.fixurl(
 851                         mw.config.get( 'wgServer' ) + mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js'
 852                 );
 853                 // Ensure a protocol-relative URL for this test
 854                 target = target.replace( /https?:/, '' );
 855                 assert.strictEqual( target.slice( 0, 2 ), '//', 'URL is protocol-relative' );
 856
 857                 mw.loader.testCallback = function () {
 858                         // Ensure once, delete now
 859                         delete mw.loader.testCallback;
 860                         assert.ok( true, 'callback' );
 861                         done();
 862                 };
 863
 864                 // Go!
 865                 mw.loader.load( target );
 866         } );
 867
 868         QUnit.test( '.load( "/absolute-path" )', function ( assert ) {
 869                 var target,
 870                         done = assert.async();
 871
 872                 // URL to the callback script
 873                 target = QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' );
 874                 assert.strictEqual( target.slice( 0, 1 ), '/', 'URL is relative to document root' );
 875
 876                 mw.loader.testCallback = function () {
 877                         // Ensure once, delete now
 878                         delete mw.loader.testCallback;
 879                         assert.ok( true, 'callback' );
 880                         done();
 881                 };
 882
 883                 // Go!
 884                 mw.loader.load( target );
 885         } );
 886
 887         QUnit.test( 'Empty string module name - T28804', function ( assert ) {
 888                 var done = false;
 889
 890                 assert.strictEqual( mw.loader.getState( '' ), null, 'State (unregistered)' );
 891
 892                 mw.loader.register( '', 'v1' );
 893                 assert.strictEqual( mw.loader.getState( '' ), 'registered', 'State (registered)' );
 894                 assert.strictEqual( mw.loader.getVersion( '' ), 'v1', 'Version' );
 895
 896                 mw.loader.implement( '', function () {
 897                         done = true;
 898                 } );
 899
 900                 return mw.loader.using( '', function () {
 901                         assert.strictEqual( done, true, 'script ran' );
 902                         assert.strictEqual( mw.loader.getState( '' ), 'ready', 'State (ready)' );
 903                 } );
 904         } );
 905
 906         QUnit.test( 'Executing race - T112232', function ( assert ) {
 907                 var done = false;
 908
 909                 // The red herring schedules its CSS buffer first. In T112232, a bug in the
 910                 // state machine would cause the job for testRaceLoadMe to run with an earlier job.
 911                 mw.loader.implement(
 912                         'testRaceRedHerring',
 913                         function () {},
 914                         { css: [ '.mw-testRaceRedHerring {}' ] }
 915                 );
 916                 mw.loader.implement(
 917                         'testRaceLoadMe',
 918                         function () {
 919                                 done = true;
 920                         },
 921                         { css: [ '.mw-testRaceLoadMe { float: left; }' ] }
 922                 );
 923
 924                 mw.loader.load( [ 'testRaceRedHerring', 'testRaceLoadMe' ] );
 925                 return mw.loader.using( 'testRaceLoadMe', function () {
 926                         assert.strictEqual( done, true, 'script ran' );
 927                         assert.strictEqual( mw.loader.getState( 'testRaceLoadMe' ), 'ready', 'state' );
 928                 } );
 929         } );
 930
 931         QUnit.test( 'Stale response caching - T117587', function ( assert ) {
 932                 var count = 0;
 933                 // Enable store and stub timeout/idle scheduling
 934                 this.sandbox.stub( mw.loader.store, 'enabled', true );
 935                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
 936                         fn();
 937                 } );
 938                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
 939                         fn();
 940                 } );
 941
 942                 mw.loader.register( 'test.stale', 'v2' );
 943                 assert.strictEqual( mw.loader.store.get( 'test.stale' ), false, 'Not in store' );
 944
 945                 mw.loader.implement( 'test.stale@v1', function () {
 946                         count++;
 947                 } );
 948
 949                 return mw.loader.using( 'test.stale' )
 950                         .then( function () {
 951                                 assert.strictEqual( count, 1 );
 952                                 // After implementing, registry contains version as implemented by the response.
 953                                 assert.strictEqual( mw.loader.getVersion( 'test.stale' ), 'v1', 'Override version' );
 954                                 assert.strictEqual( mw.loader.getState( 'test.stale' ), 'ready' );
 955                                 assert.strictEqual( typeof mw.loader.store.get( 'test.stale' ), 'string', 'In store' );
 956                         } )
 957                         .then( function () {
 958                                 // Reset run time, but keep mw.loader.store
 959                                 mw.loader.moduleRegistry[ 'test.stale' ].script = undefined;
 960                                 mw.loader.moduleRegistry[ 'test.stale' ].state = 'registered';
 961                                 mw.loader.moduleRegistry[ 'test.stale' ].version = 'v2';
 962
 963                                 // Module was stored correctly as v1
 964                                 // On future navigations, it will be ignored until evicted
 965                                 assert.strictEqual( mw.loader.store.get( 'test.stale' ), false, 'Not in store' );
 966                         } );
 967         } );
 968
 969         QUnit.test( 'Stale response caching - backcompat', function ( assert ) {
 970                 var script = 0;
 971                 // Enable store and stub timeout/idle scheduling
 972                 this.sandbox.stub( mw.loader.store, 'enabled', true );
 973                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
 974                         fn();
 975                 } );
 976                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
 977                         fn();
 978                 } );
 979
 980                 mw.loader.register( 'test.stalebc', 'v2' );
 981                 assert.strictEqual( mw.loader.store.get( 'test.stalebc' ), false, 'Not in store' );
 982
 983                 mw.loader.implement( 'test.stalebc', function () {
 984                         script++;
 985                 } );
 986
 987                 return mw.loader.using( 'test.stalebc' )
 988                         .then( function () {
 989                                 assert.strictEqual( script, 1, 'module script ran' );
 990                                 assert.strictEqual( mw.loader.getState( 'test.stalebc' ), 'ready' );
 991                                 assert.strictEqual( typeof mw.loader.store.get( 'test.stalebc' ), 'string', 'In store' );
 992                         } )
 993                         .then( function () {
 994                                 // Reset run time, but keep mw.loader.store
 995                                 mw.loader.moduleRegistry[ 'test.stalebc' ].script = undefined;
 996                                 mw.loader.moduleRegistry[ 'test.stalebc' ].state = 'registered';
 997                                 mw.loader.moduleRegistry[ 'test.stalebc' ].version = 'v2';
 998
 999                                 // Legacy behaviour is storing under the expected version,
1000                                 // which woudl lead to whitewashing and stale values (T117587).
1001                                 assert.ok( mw.loader.store.get( 'test.stalebc' ), 'In store' );
1002                         } );
1003         } );
1004
1005         QUnit.test( 'No storing of group=private responses', function ( assert ) {
1006                 var name = 'test.group.priv';
1007
1008                 // Enable store and stub timeout/idle scheduling
1009                 this.sandbox.stub( mw.loader.store, 'enabled', true );
1010                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
1011                         fn();
1012                 } );
1013                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
1014                         fn();
1015                 } );
1016
1017                 // See ResourceLoaderStartUpModule::$groupIds
1018                 mw.loader.register( name, 'x', [], 1 );
1019                 assert.strictEqual( mw.loader.store.get( name ), false, 'Not in store' );
1020
1021                 mw.loader.implement( name, function () {} );
1022                 return mw.loader.using( name ).then( function () {
1023                         assert.strictEqual( mw.loader.getState( name ), 'ready' );
1024                         assert.strictEqual( mw.loader.store.get( name ), false, 'Still not in store' );
1025                 } );
1026         } );
1027
1028         QUnit.test( 'No storing of group=user responses', function ( assert ) {
1029                 var name = 'test.group.user';
1030
1031                 // Enable store and stub timeout/idle scheduling
1032                 this.sandbox.stub( mw.loader.store, 'enabled', true );
1033                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
1034                         fn();
1035                 } );
1036                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
1037                         fn();
1038                 } );
1039
1040                 // See ResourceLoaderStartUpModule::$groupIds
1041                 mw.loader.register( name, 'y', [], 0 );
1042                 assert.strictEqual( mw.loader.store.get( name ), false, 'Not in store' );
1043
1044                 mw.loader.implement( name, function () {} );
1045                 return mw.loader.using( name ).then( function () {
1046                         assert.strictEqual( mw.loader.getState( name ), 'ready' );
1047                         assert.strictEqual( mw.loader.store.get( name ), false, 'Still not in store' );
1048                 } );
1049         } );
1050
1051         QUnit.test( 'mw.loader.store.init - Invalid JSON', function ( assert ) {
1052                 // Reset
1053                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1054                 this.sandbox.stub( mw.loader.store, 'items', {} );
1055                 this.resetStoreKey = true;
1056                 localStorage.setItem( mw.loader.store.key, 'invalid' );
1057
1058                 mw.loader.store.init();
1059                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1060                 assert.strictEqual(
1061                         $.isEmptyObject( mw.loader.store.items ),
1062                         true,
1063                         'Items starts fresh'
1064                 );
1065         } );
1066
1067         QUnit.test( 'mw.loader.store.init - Wrong JSON', function ( assert ) {
1068                 // Reset
1069                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1070                 this.sandbox.stub( mw.loader.store, 'items', {} );
1071                 this.resetStoreKey = true;
1072                 localStorage.setItem( mw.loader.store.key, JSON.stringify( { wrong: true } ) );
1073
1074                 mw.loader.store.init();
1075                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1076                 assert.strictEqual(
1077                         $.isEmptyObject( mw.loader.store.items ),
1078                         true,
1079                         'Items starts fresh'
1080                 );
1081         } );
1082
1083         QUnit.test( 'mw.loader.store.init - Expired JSON', function ( assert ) {
1084                 // Reset
1085                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1086                 this.sandbox.stub( mw.loader.store, 'items', {} );
1087                 this.resetStoreKey = true;
1088                 localStorage.setItem( mw.loader.store.key, JSON.stringify( {
1089                         items: { use: 'not me' },
1090                         vary: mw.loader.store.vary,
1091                         asOf: 130161 // 2011-04-01 12:00
1092                 } ) );
1093
1094                 mw.loader.store.init();
1095                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1096                 assert.strictEqual(
1097                         $.isEmptyObject( mw.loader.store.items ),
1098                         true,
1099                         'Items starts fresh'
1100                 );
1101         } );
1102
1103         QUnit.test( 'mw.loader.store.init - Good JSON', function ( assert ) {
1104                 // Reset
1105                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1106                 this.sandbox.stub( mw.loader.store, 'items', {} );
1107                 this.resetStoreKey = true;
1108                 localStorage.setItem( mw.loader.store.key, JSON.stringify( {
1109                         items: { use: 'me' },
1110                         vary: mw.loader.store.vary,
1111                         asOf: Math.ceil( Date.now() / 1e7 ) - 5 // ~ 13 hours ago
1112                 } ) );
1113
1114                 mw.loader.store.init();
1115                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1116                 assert.deepEqual(
1117                         mw.loader.store.items,
1118                         { use: 'me' },
1119                         'Stored items are loaded'
1120                 );
1121         } );
1122
1123         QUnit.test( 'require()', function ( assert ) {
1124                 mw.loader.register( [
1125                         [ 'test.require1', '0' ],
1126                         [ 'test.require2', '0' ],
1127                         [ 'test.require3', '0' ],
1128                         [ 'test.require4', '0', [ 'test.require3' ] ]
1129                 ] );
1130                 mw.loader.implement( 'test.require1', function () {} );
1131                 mw.loader.implement( 'test.require2', function ( $, jQuery, require, module ) {
1132                         module.exports = 1;
1133                 } );
1134                 mw.loader.implement( 'test.require3', function ( $, jQuery, require, module ) {
1135                         module.exports = function () {
1136                                 return 'hello world';
1137                         };
1138                 } );
1139                 mw.loader.implement( 'test.require4', function ( $, jQuery, require, module ) {
1140                         var other = require( 'test.require3' );
1141                         module.exports = {
1142                                 pizza: function () {
1143                                         return other();
1144                                 }
1145                         };
1146                 } );
1147                 return mw.loader.using( [ 'test.require1', 'test.require2', 'test.require3', 'test.require4' ] ).then( function ( require ) {
1148                         var module1, module2, module3, module4;
1149
1150                         module1 = require( 'test.require1' );
1151                         module2 = require( 'test.require2' );
1152                         module3 = require( 'test.require3' );
1153                         module4 = require( 'test.require4' );
1154
1155                         assert.strictEqual( typeof module1, 'object', 'export of module with no export' );
1156                         assert.strictEqual( module2, 1, 'export a number' );
1157                         assert.strictEqual( module3(), 'hello world', 'export a function' );
1158                         assert.strictEqual( typeof module4.pizza, 'function', 'export an object' );
1159                         assert.strictEqual( module4.pizza(), 'hello world', 'module can require other modules' );
1160
1161                         assert.throws( function () {
1162                                 require( '_badmodule' );
1163                         }, /is not loaded/, 'Requesting non-existent modules throws error.' );
1164                 } );
1165         } );
1166
1167         QUnit.test( 'require() in debug mode', function ( assert ) {
1168                 var path = mw.config.get( 'wgScriptPath' );
1169                 mw.loader.register( [
1170                         [ 'test.require.define', '0' ],
1171                         [ 'test.require.callback', '0', [ 'test.require.define' ] ]
1172                 ] );
1173                 mw.loader.implement( 'test.require.callback', [ QUnit.fixurl( path + '/tests/qunit/data/requireCallMwLoaderTestCallback.js' ) ] );
1174                 mw.loader.implement( 'test.require.define', [ QUnit.fixurl( path + '/tests/qunit/data/defineCallMwLoaderTestCallback.js' ) ] );
1175
1176                 return mw.loader.using( 'test.require.callback' ).then( function ( require ) {
1177                         var cb = require( 'test.require.callback' );
1178                         assert.strictEqual( cb.immediate, 'Defined.', 'module.exports and require work in debug mode' );
1179                         // Must use try-catch because cb.later() will throw if require is undefined,
1180                         // which doesn't work well inside Deferred.then() when using jQuery 1.x with QUnit
1181                         try {
1182                                 assert.strictEqual( cb.later(), 'Defined.', 'require works asynchrously in debug mode' );
1183                         } catch ( e ) {
1184                                 assert.strictEqual( String( e ), null, 'require works asynchrously in debug mode' );
1185                         }
1186                 } );
1187         } );
1188
1189         QUnit.test( 'Implicit dependencies', function ( assert ) {
1190                 var user = 0,
1191                         site = 0,
1192                         siteFromUser = 0;
1193
1194                 mw.loader.implement(
1195                         'site',
1196                         function () {
1197                                 site++;
1198                         }
1199                 );
1200                 mw.loader.implement(
1201                         'user',
1202                         function () {
1203                                 user++;
1204                                 siteFromUser = site;
1205                         }
1206                 );
1207
1208                 return mw.loader.using( 'user', function () {
1209                         assert.strictEqual( site, 1, 'site module' );
1210                         assert.strictEqual( user, 1, 'user module' );
1211                         assert.strictEqual( siteFromUser, 1, 'site ran before user' );
1212                 } ).always( function () {
1213                         // Reset
1214                         mw.loader.moduleRegistry.site.state = 'registered';
1215                         mw.loader.moduleRegistry.user.state = 'registered';
1216                 } );
1217         } );
1218
1219         QUnit.test( '.getScript() - success', function ( assert ) {
1220                 var scriptUrl = QUnit.fixurl(
1221                         mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mediawiki.loader.getScript.example.js'
1222                 );
1223
1224                 return mw.loader.getScript( scriptUrl ).then(
1225                         function () {
1226                                 assert.strictEqual( mw.getScriptExampleScriptLoaded, true, 'Data attached to a global object is available' );
1227                         }
1228                 );
1229         } );
1230
1231         QUnit.test( '.getScript() - failure', function ( assert ) {
1232                 assert.rejects(
1233                         mw.loader.getScript( 'https://example.test/not-found' ),
1234                         /Failed to load script/,
1235                         'Descriptive error message'
1236                 );
1237         } );
1238
1239 }() );