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, 'trackError', 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, 'trackError', 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.log, 'warn', function ( str ) {
 250                         capture.push( str );
 251                 } );
 252
 253                 mw.loader.load( 'test.load.unreg' );
 254                 assert.deepEqual( capture, [ 'Skipped unresolvable module test.load.unreg' ] );
 255         } );
 256
 257         // Regression test for T36853
 258         QUnit.test( '.load() - Error: Missing dependency', function ( assert ) {
 259                 var capture = [];
 260                 this.sandbox.stub( mw, 'trackError', function ( topic, data ) {
 261                         capture.push( {
 262                                 topic: topic,
 263                                 error: data.exception && data.exception.message,
 264                                 source: data.source
 265                         } );
 266                 } );
 267
 268                 mw.loader.register( [
 269                         [ 'test.load.missingdep1', '0', [ 'test.load.missingdep2' ] ],
 270                         [ 'test.load.missingdep', '0', [ 'test.load.missingdep1' ] ]
 271                 ] );
 272                 mw.loader.load( 'test.load.missingdep' );
 273                 assert.deepEqual(
 274                         [ {
 275                                 topic: 'resourceloader.exception',
 276                                 error: 'Unknown module: test.load.missingdep2',
 277                                 source: 'resolve'
 278                         } ],
 279                         capture
 280                 );
 281         } );
 282
 283         QUnit.test( '.implement( styles={ "css": [text, ..] } )', function ( assert ) {
 284                 var $element = $( '<div class="mw-test-implement-a"></div>' ).appendTo( '#qunit-fixture' );
 285
 286                 assert.notEqual(
 287                         $element.css( 'float' ),
 288                         'right',
 289                         'style is clear'
 290                 );
 291
 292                 mw.loader.implement(
 293                         'test.implement.a',
 294                         function () {
 295                                 assert.strictEqual(
 296                                         $element.css( 'float' ),
 297                                         'right',
 298                                         'style is applied'
 299                                 );
 300                         },
 301                         {
 302                                 all: '.mw-test-implement-a { float: right; }'
 303                         }
 304                 );
 305
 306                 return mw.loader.using( 'test.implement.a' );
 307         } );
 308
 309         QUnit.test( '.implement( styles={ "url": { <media>: [url, ..] } } )', function ( assert ) {
 310                 var $element1 = $( '<div class="mw-test-implement-b1"></div>' ).appendTo( '#qunit-fixture' ),
 311                         $element2 = $( '<div class="mw-test-implement-b2"></div>' ).appendTo( '#qunit-fixture' ),
 312                         $element3 = $( '<div class="mw-test-implement-b3"></div>' ).appendTo( '#qunit-fixture' ),
 313                         done = assert.async();
 314
 315                 assert.notEqual(
 316                         $element1.css( 'text-align' ),
 317                         'center',
 318                         'style is clear'
 319                 );
 320                 assert.notEqual(
 321                         $element2.css( 'float' ),
 322                         'left',
 323                         'style is clear'
 324                 );
 325                 assert.notEqual(
 326                         $element3.css( 'text-align' ),
 327                         'right',
 328                         'style is clear'
 329                 );
 330
 331                 mw.loader.implement(
 332                         'test.implement.b',
 333                         function () {
 334                                 // Note: done() must only be called when the entire test is
 335                                 // complete. So, make sure that we don't start until *both*
 336                                 // assertStyleAsync calls have completed.
 337                                 var pending = 2;
 338                                 assertStyleAsync( assert, $element2, 'float', 'left', function () {
 339                                         assert.notEqual( $element1.css( 'text-align' ), 'center', 'print style is not applied' );
 340
 341                                         pending--;
 342                                         if ( pending === 0 ) {
 343                                                 done();
 344                                         }
 345                                 } );
 346                                 assertStyleAsync( assert, $element3, 'float', 'right', function () {
 347                                         assert.notEqual( $element1.css( 'text-align' ), 'center', 'print style is not applied' );
 348
 349                                         pending--;
 350                                         if ( pending === 0 ) {
 351                                                 done();
 352                                         }
 353                                 } );
 354                         },
 355                         {
 356                                 url: {
 357                                         print: [ urlStyleTest( '.mw-test-implement-b1', 'text-align', 'center' ) ],
 358                                         screen: [
 359                                                 // T42834: Make sure it actually works with more than 1 stylesheet reference
 360                                                 urlStyleTest( '.mw-test-implement-b2', 'float', 'left' ),
 361                                                 urlStyleTest( '.mw-test-implement-b3', 'float', 'right' )
 362                                         ]
 363                                 }
 364                         }
 365                 );
 366
 367                 mw.loader.load( 'test.implement.b' );
 368         } );
 369
 370         // Backwards compatibility
 371         QUnit.test( '.implement( styles={ <media>: text } ) (back-compat)', function ( assert ) {
 372                 var $element = $( '<div class="mw-test-implement-c"></div>' ).appendTo( '#qunit-fixture' );
 373
 374                 assert.notEqual(
 375                         $element.css( 'float' ),
 376                         'right',
 377                         'style is clear'
 378                 );
 379
 380                 mw.loader.implement(
 381                         'test.implement.c',
 382                         function () {
 383                                 assert.strictEqual(
 384                                         $element.css( 'float' ),
 385                                         'right',
 386                                         'style is applied'
 387                                 );
 388                         },
 389                         {
 390                                 all: '.mw-test-implement-c { float: right; }'
 391                         }
 392                 );
 393
 394                 return mw.loader.using( 'test.implement.c' );
 395         } );
 396
 397         // Backwards compatibility
 398         QUnit.test( '.implement( styles={ <media>: [url, ..] } ) (back-compat)', function ( assert ) {
 399                 var $element = $( '<div class="mw-test-implement-d"></div>' ).appendTo( '#qunit-fixture' ),
 400                         $element2 = $( '<div class="mw-test-implement-d2"></div>' ).appendTo( '#qunit-fixture' ),
 401                         done = assert.async();
 402
 403                 assert.notEqual(
 404                         $element.css( 'float' ),
 405                         'right',
 406                         'style is clear'
 407                 );
 408                 assert.notEqual(
 409                         $element2.css( 'text-align' ),
 410                         'center',
 411                         'style is clear'
 412                 );
 413
 414                 mw.loader.implement(
 415                         'test.implement.d',
 416                         function () {
 417                                 assertStyleAsync( assert, $element, 'float', 'right', function () {
 418                                         assert.notEqual( $element2.css( 'text-align' ), 'center', 'print style is not applied (T42500)' );
 419                                         done();
 420                                 } );
 421                         },
 422                         {
 423                                 all: [ urlStyleTest( '.mw-test-implement-d', 'float', 'right' ) ],
 424                                 print: [ urlStyleTest( '.mw-test-implement-d2', 'text-align', 'center' ) ]
 425                         }
 426                 );
 427
 428                 mw.loader.load( 'test.implement.d' );
 429         } );
 430
 431         QUnit.test( '.implement( messages before script )', function ( assert ) {
 432                 mw.loader.implement(
 433                         'test.implement.order',
 434                         function () {
 435                                 assert.strictEqual( mw.loader.getState( 'test.implement.order' ), 'executing', 'state during script execution' );
 436                                 assert.strictEqual( mw.msg( 'test-foobar' ), 'Hello Foobar, $1!', 'messages load before script execution' );
 437                         },
 438                         {},
 439                         {
 440                                 'test-foobar': 'Hello Foobar, $1!'
 441                         }
 442                 );
 443
 444                 return mw.loader.using( 'test.implement.order' ).then( function () {
 445                         assert.strictEqual( mw.loader.getState( 'test.implement.order' ), 'ready', 'final success state' );
 446                 } );
 447         } );
 448
 449         // @import (T33676)
 450         QUnit.test( '.implement( styles with @import )', function ( assert ) {
 451                 var $element,
 452                         done = assert.async();
 453
 454                 mw.loader.implement(
 455                         'test.implement.import',
 456                         function () {
 457                                 $element = $( '<div class="mw-test-implement-import">Foo bar</div>' ).appendTo( '#qunit-fixture' );
 458
 459                                 assertStyleAsync( assert, $element, 'float', 'right', function () {
 460                                         assert.strictEqual( $element.css( 'text-align' ), 'center',
 461                                                 'CSS styles after the @import rule are working'
 462                                         );
 463
 464                                         done();
 465                                 } );
 466                         },
 467                         {
 468                                 css: [
 469                                         '@import url(\''
 470                                                 + urlStyleTest( '.mw-test-implement-import', 'float', 'right' )
 471                                                 + '\');\n'
 472                                                 + '.mw-test-implement-import { text-align: center; }'
 473                                 ]
 474                         }
 475                 );
 476
 477                 return mw.loader.using( 'test.implement.import' );
 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.strictEqual(
 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.strictEqual(
 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                 return mw.loader.using( 'test.onlyscripts', function () {
 534                         assert.strictEqual( mw.loader.getState( 'test.onlyscripts' ), 'ready' );
 535                 } );
 536         } );
 537
 538         QUnit.test( '.implement( only messages )', function ( assert ) {
 539                 assert.assertFalse( mw.messages.exists( 'T31107' ), 'Verify that the test message doesn\'t exist yet' );
 540
 541                 mw.loader.implement( 'test.implement.msgs', [], {}, { T31107: 'loaded' } );
 542
 543                 return mw.loader.using( 'test.implement.msgs', function () {
 544                         assert.ok( mw.messages.exists( 'T31107' ), 'T31107: messages-only module should implement ok' );
 545                 } );
 546         } );
 547
 548         QUnit.test( '.implement( empty )', function ( assert ) {
 549                 mw.loader.implement( 'test.empty' );
 550                 return mw.loader.using( 'test.empty', function () {
 551                         assert.strictEqual( mw.loader.getState( 'test.empty' ), 'ready' );
 552                 } );
 553         } );
 554
 555         QUnit.test( '.implement( package files )', function ( assert ) {
 556                 var done = assert.async(),
 557                         initJsRan = false,
 558                         counter = 41;
 559                 mw.loader.implement(
 560                         'test.implement.packageFiles',
 561                         {
 562                                 main: 'resources/src/foo/init.js',
 563                                 files: {
 564                                         'resources/src/foo/data/hello.json': { hello: 'world' },
 565                                         'resources/src/foo/foo.js': function ( require, module ) {
 566                                                 counter++;
 567                                                 module.exports = { answer: counter };
 568                                         },
 569                                         'resources/src/bar/bar.js': function ( require, module ) {
 570                                                 var core = require( './core.js' );
 571                                                 module.exports = { data: core.sayHello( 'Alice' ) };
 572                                         },
 573                                         'resources/src/bar/core.js': function ( require, module ) {
 574                                                 module.exports = { sayHello: function ( name ) {
 575                                                         return 'Hello ' + name;
 576                                                 } };
 577                                         },
 578                                         'resources/src/foo/init.js': function ( require ) {
 579                                                 initJsRan = true;
 580                                                 assert.deepEqual( require( './data/hello.json' ), { hello: 'world' }, 'require() with .json file' );
 581                                                 assert.deepEqual( require( './foo.js' ), { answer: 42 }, 'require() with .js file in same directory' );
 582                                                 assert.deepEqual( require( '../bar/bar.js' ), { data: 'Hello Alice' }, 'require() with ../ of a file that uses same-directory require()' );
 583                                                 assert.deepEqual( require( './foo.js' ), { answer: 42 }, 'require()ing the same script twice only runs it once' );
 584                                         }
 585                                 }
 586                         },
 587                         {},
 588                         {},
 589                         {}
 590                 );
 591                 mw.loader.using( 'test.implement.packageFiles' ).done( function () {
 592                         assert.ok( initJsRan, 'main JS file is executed' );
 593                         done();
 594                 } );
 595         } );
 596
 597         QUnit.test( '.addSource()', function ( assert ) {
 598                 mw.loader.addSource( { testsource1: 'https://1.test/src' } );
 599
 600                 assert.throws( function () {
 601                         mw.loader.addSource( { testsource1: 'https://1.test/src' } );
 602                 }, /already registered/, 'duplicate pair from addSource(Object)' );
 603
 604                 assert.throws( function () {
 605                         mw.loader.addSource( { testsource1: 'https://1.test/src-diff' } );
 606                 }, /already registered/, 'duplicate ID from addSource(Object)' );
 607         } );
 608
 609         // @covers mw.loader#batchRequest
 610         // This is a regression test because in the past we called getCombinedVersion()
 611         // for all requested modules, before url splitting took place.
 612         // Discovered as part of T188076, but not directly related.
 613         QUnit.test( 'Url composition (modules considered for version)', function ( assert ) {
 614                 mw.loader.register( [
 615                         // [module, version, dependencies, group, source]
 616                         [ 'testUrlInc', 'url', [], null, 'testloader' ],
 617                         [ 'testUrlIncDump', 'dump', [], null, 'testloader' ]
 618                 ] );
 619
 620                 mw.loader.maxQueryLength = 10;
 621
 622                 return mw.loader.using( [ 'testUrlIncDump', 'testUrlInc' ] ).then( function ( require ) {
 623                         assert.propEqual(
 624                                 require( 'testUrlIncDump' ).query,
 625                                 {
 626                                         modules: 'testUrlIncDump',
 627                                         // Expected: Combine hashes only for the module in the specific HTTP request
 628                                         //   hash fnv132 => "13e9zzn"
 629                                         // Wrong: Combine hashes for all requested modules, before request-splitting
 630                                         //   hash fnv132 => "18kz9ca"
 631                                         version: '13e9z'
 632                                 },
 633                                 'Query parameters'
 634                         );
 635
 636                         assert.strictEqual( mw.loader.getState( 'testUrlInc' ), 'ready', 'testUrlInc also loaded' );
 637                 } );
 638         } );
 639
 640         // @covers mw.loader#batchRequest
 641         // @covers mw.loader#buildModulesString
 642         QUnit.test( 'Url composition (order of modules for version) – T188076', function ( assert ) {
 643                 mw.loader.register( [
 644                         // [module, version, dependencies, group, source]
 645                         [ 'testUrlOrder', 'url', [], null, 'testloader' ],
 646                         [ 'testUrlOrder.a', '1', [], null, 'testloader' ],
 647                         [ 'testUrlOrder.b', '2', [], null, 'testloader' ],
 648                         [ 'testUrlOrderDump', 'dump', [], null, 'testloader' ]
 649                 ] );
 650
 651                 return mw.loader.using( [
 652                         'testUrlOrderDump',
 653                         'testUrlOrder.b',
 654                         'testUrlOrder.a',
 655                         'testUrlOrder'
 656                 ] ).then( function ( require ) {
 657                         assert.propEqual(
 658                                 require( 'testUrlOrderDump' ).query,
 659                                 {
 660                                         modules: 'testUrlOrder,testUrlOrderDump|testUrlOrder.a,b',
 661                                         // Expected: Combined by sorting names after string packing
 662                                         //   hash fnv132 = "1knqzan"
 663                                         // Wrong: Combined by sorting names before string packing
 664                                         //   hash fnv132 => "11eo3in"
 665                                         version: '1knqz'
 666                                 },
 667                                 'Query parameters'
 668                         );
 669                 } );
 670         } );
 671
 672         QUnit.test( 'Broken indirect dependency', function ( assert ) {
 673                 this.useStubClock();
 674
 675                 // Don't actually emit an error event
 676                 this.sandbox.stub( mw, 'trackError' );
 677
 678                 mw.loader.register( [
 679                         [ 'test.module1', '0' ],
 680                         [ 'test.module2', '0', [ 'test.module1' ] ],
 681                         [ 'test.module3', '0', [ 'test.module2' ] ]
 682                 ] );
 683                 mw.loader.implement( 'test.module1', function () {
 684                         throw new Error( 'expected' );
 685                 }, {}, {} );
 686                 this.tick();
 687
 688                 assert.strictEqual( mw.loader.getState( 'test.module1' ), 'error', 'State of test.module1' );
 689                 assert.strictEqual( mw.loader.getState( 'test.module2' ), 'error', 'State of test.module2' );
 690                 assert.strictEqual( mw.loader.getState( 'test.module3' ), 'error', 'State of test.module3' );
 691
 692                 assert.strictEqual( mw.trackError.callCount, 1 );
 693         } );
 694
 695         QUnit.test( 'Out-of-order implementation', function ( assert ) {
 696                 this.useStubClock();
 697
 698                 mw.loader.register( [
 699                         [ 'test.module4', '0' ],
 700                         [ 'test.module5', '0', [ 'test.module4' ] ],
 701                         [ 'test.module6', '0', [ 'test.module5' ] ]
 702                 ] );
 703
 704                 mw.loader.implement( 'test.module4', function () {} );
 705                 this.tick();
 706                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'State of test.module4' );
 707                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'registered', 'State of test.module5' );
 708                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'registered', 'State of test.module6' );
 709
 710                 mw.loader.implement( 'test.module6', function () {} );
 711                 this.tick();
 712                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'State of test.module4' );
 713                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'registered', 'State of test.module5' );
 714                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'loaded', 'State of test.module6' );
 715
 716                 mw.loader.implement( 'test.module5', function () {} );
 717                 this.tick();
 718                 assert.strictEqual( mw.loader.getState( 'test.module4' ), 'ready', 'State of test.module4' );
 719                 assert.strictEqual( mw.loader.getState( 'test.module5' ), 'ready', 'State of test.module5' );
 720                 assert.strictEqual( mw.loader.getState( 'test.module6' ), 'ready', 'State of test.module6' );
 721         } );
 722
 723         QUnit.test( 'Missing dependency', function ( assert ) {
 724                 this.useStubClock();
 725
 726                 mw.loader.register( [
 727                         [ 'test.module7', '0' ],
 728                         [ 'test.module8', '0', [ 'test.module7' ] ],
 729                         [ 'test.module9', '0', [ 'test.module8' ] ]
 730                 ] );
 731
 732                 mw.loader.implement( 'test.module8', function () {} );
 733                 this.tick();
 734                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'registered', 'Expected "registered" state for test.module7' );
 735                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'loaded', 'Expected "loaded" state for test.module8' );
 736                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'registered', 'Expected "registered" state for test.module9' );
 737
 738                 mw.loader.state( { 'test.module7': 'missing' } );
 739                 this.tick();
 740                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'missing', 'Expected "missing" state for test.module7' );
 741                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'error', 'Expected "error" state for test.module8' );
 742                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'error', 'Expected "error" state for test.module9' );
 743
 744                 mw.loader.implement( 'test.module9', function () {} );
 745                 this.tick();
 746                 assert.strictEqual( mw.loader.getState( 'test.module7' ), 'missing', 'Expected "missing" state for test.module7' );
 747                 assert.strictEqual( mw.loader.getState( 'test.module8' ), 'error', 'Expected "error" state for test.module8' );
 748                 assert.strictEqual( mw.loader.getState( 'test.module9' ), 'error', 'Expected "error" state for test.module9' );
 749
 750                 // Restore clock for QUnit and $.Deferred internals
 751                 this.clock.restore();
 752                 return mw.loader.using( [ 'test.module7' ] ).then(
 753                         function () {
 754                                 throw new Error( 'Success fired despite missing dependency' );
 755                         },
 756                         function ( e, dependencies ) {
 757                                 assert.strictEqual( Array.isArray( dependencies ), true, 'Expected array of dependencies' );
 758                                 assert.deepEqual(
 759                                         dependencies,
 760                                         [ 'jquery', 'mediawiki.base', 'test.module7' ],
 761                                         'Error callback called with module test.module7'
 762                                 );
 763                         }
 764                 ).then( function () {
 765                         return mw.loader.using( [ 'test.module9' ] );
 766                 } ).then(
 767                         function () {
 768                                 throw new Error( 'Success fired despite missing dependency' );
 769                         },
 770                         function ( e, dependencies ) {
 771                                 assert.strictEqual( Array.isArray( dependencies ), true, 'Expected array of dependencies' );
 772                                 dependencies.sort();
 773                                 assert.deepEqual(
 774                                         dependencies,
 775                                         [ 'jquery', 'mediawiki.base', 'test.module7', 'test.module8', 'test.module9' ],
 776                                         'Error callback called with all three modules as dependencies'
 777                                 );
 778                         }
 779                 );
 780         } );
 781
 782         QUnit.test( 'Dependency handling', function ( assert ) {
 783                 mw.loader.register( [
 784                         // [module, version, dependencies, group, source]
 785                         [ 'testMissing', '1', [], null, 'testloader' ],
 786                         [ 'testUsesMissing', '1', [ 'testMissing' ], null, 'testloader' ],
 787                         [ 'testUsesNestedMissing', '1', [ 'testUsesMissing' ], null, 'testloader' ]
 788                 ] );
 789
 790                 function verifyModuleStates() {
 791                         assert.strictEqual( mw.loader.getState( 'testMissing' ), 'missing', 'Module "testMissing" state' );
 792                         assert.strictEqual( mw.loader.getState( 'testUsesMissing' ), 'error', 'Module "testUsesMissing" state' );
 793                         assert.strictEqual( mw.loader.getState( 'testUsesNestedMissing' ), 'error', 'Module "testUsesNestedMissing" state' );
 794                 }
 795
 796                 return mw.loader.using( [ 'testUsesNestedMissing' ] ).then(
 797                         function () {
 798                                 verifyModuleStates();
 799                                 throw new Error( 'Error handler should be invoked.' );
 800                         },
 801                         function ( e, modules ) {
 802                                 // When the server sets state of 'testMissing' to 'missing'
 803                                 // it should bubble up and trigger the error callback of the job for 'testUsesNestedMissing'.
 804                                 assert.strictEqual( modules.indexOf( 'testMissing' ) !== -1, true, 'Triggered by testMissing.' );
 805
 806                                 verifyModuleStates();
 807                         }
 808                 );
 809         } );
 810
 811         QUnit.test( 'Skip-function handling', function ( assert ) {
 812                 mw.loader.register( [
 813                         // [module, version, dependencies, group, source, skip]
 814                         [ 'testSkipped', '1', [], null, 'testloader', 'return true;' ],
 815                         [ 'testNotSkipped', '1', [], null, 'testloader', 'return false;' ],
 816                         [ 'testUsesSkippable', '1', [ 'testSkipped', 'testNotSkipped' ], null, 'testloader' ]
 817                 ] );
 818
 819                 return mw.loader.using( [ 'testUsesSkippable' ] ).then(
 820                         function () {
 821                                 assert.strictEqual( mw.loader.getState( 'testSkipped' ), 'ready', 'Skipped module' );
 822                                 assert.strictEqual( mw.loader.getState( 'testNotSkipped' ), 'ready', 'Regular module' );
 823                                 assert.strictEqual( mw.loader.getState( 'testUsesSkippable' ), 'ready', 'Regular module with skippable dependency' );
 824                         },
 825                         function ( e, badmodules ) {
 826                                 // Should not fail and QUnit would already catch this,
 827                                 // but add a handler anyway to report details from 'badmodules
 828                                 assert.deepEqual( badmodules, [], 'Bad modules' );
 829                         }
 830                 );
 831         } );
 832
 833         // This bug was actually already fixed in 1.18 and later when discovered in 1.17.
 834         QUnit.test( '.load( "//protocol-relative" ) - T32825', function ( assert ) {
 835                 var target,
 836                         done = assert.async();
 837
 838                 // URL to the callback script
 839                 target = QUnit.fixurl(
 840                         mw.config.get( 'wgServer' ) + mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js'
 841                 );
 842                 // Ensure a protocol-relative URL for this test
 843                 target = target.replace( /https?:/, '' );
 844                 assert.strictEqual( target.slice( 0, 2 ), '//', 'URL is protocol-relative' );
 845
 846                 mw.loader.testCallback = function () {
 847                         // Ensure once, delete now
 848                         delete mw.loader.testCallback;
 849                         assert.ok( true, 'callback' );
 850                         done();
 851                 };
 852
 853                 // Go!
 854                 mw.loader.load( target );
 855         } );
 856
 857         QUnit.test( '.load( "/absolute-path" )', function ( assert ) {
 858                 var target,
 859                         done = assert.async();
 860
 861                 // URL to the callback script
 862                 target = QUnit.fixurl( mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mwLoaderTestCallback.js' );
 863                 assert.strictEqual( target.slice( 0, 1 ), '/', 'URL is relative to document root' );
 864
 865                 mw.loader.testCallback = function () {
 866                         // Ensure once, delete now
 867                         delete mw.loader.testCallback;
 868                         assert.ok( true, 'callback' );
 869                         done();
 870                 };
 871
 872                 // Go!
 873                 mw.loader.load( target );
 874         } );
 875
 876         QUnit.test( 'Empty string module name - T28804', function ( assert ) {
 877                 var done = false;
 878
 879                 assert.strictEqual( mw.loader.getState( '' ), null, 'State (unregistered)' );
 880
 881                 mw.loader.register( '', 'v1' );
 882                 assert.strictEqual( mw.loader.getState( '' ), 'registered', 'State (registered)' );
 883                 assert.strictEqual( mw.loader.getVersion( '' ), 'v1', 'Version' );
 884
 885                 mw.loader.implement( '', function () {
 886                         done = true;
 887                 } );
 888
 889                 return mw.loader.using( '', function () {
 890                         assert.strictEqual( done, true, 'script ran' );
 891                         assert.strictEqual( mw.loader.getState( '' ), 'ready', 'State (ready)' );
 892                 } );
 893         } );
 894
 895         QUnit.test( 'Executing race - T112232', function ( assert ) {
 896                 var done = false;
 897
 898                 // The red herring schedules its CSS buffer first. In T112232, a bug in the
 899                 // state machine would cause the job for testRaceLoadMe to run with an earlier job.
 900                 mw.loader.implement(
 901                         'testRaceRedHerring',
 902                         function () {},
 903                         { css: [ '.mw-testRaceRedHerring {}' ] }
 904                 );
 905                 mw.loader.implement(
 906                         'testRaceLoadMe',
 907                         function () {
 908                                 done = true;
 909                         },
 910                         { css: [ '.mw-testRaceLoadMe { float: left; }' ] }
 911                 );
 912
 913                 mw.loader.load( [ 'testRaceRedHerring', 'testRaceLoadMe' ] );
 914                 return mw.loader.using( 'testRaceLoadMe', function () {
 915                         assert.strictEqual( done, true, 'script ran' );
 916                         assert.strictEqual( mw.loader.getState( 'testRaceLoadMe' ), 'ready', 'state' );
 917                 } );
 918         } );
 919
 920         QUnit.test( 'Stale response caching - T117587', function ( assert ) {
 921                 var count = 0;
 922                 // Enable store and stub timeout/idle scheduling
 923                 this.sandbox.stub( mw.loader.store, 'enabled', true );
 924                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
 925                         fn();
 926                 } );
 927                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
 928                         fn();
 929                 } );
 930
 931                 mw.loader.register( 'test.stale', 'v2' );
 932                 assert.strictEqual( mw.loader.store.get( 'test.stale' ), false, 'Not in store' );
 933
 934                 mw.loader.implement( 'test.stale@v1', function () {
 935                         count++;
 936                 } );
 937
 938                 return mw.loader.using( 'test.stale' )
 939                         .then( function () {
 940                                 assert.strictEqual( count, 1 );
 941                                 // After implementing, registry contains version as implemented by the response.
 942                                 assert.strictEqual( mw.loader.getVersion( 'test.stale' ), 'v1', 'Override version' );
 943                                 assert.strictEqual( mw.loader.getState( 'test.stale' ), 'ready' );
 944                                 assert.strictEqual( typeof mw.loader.store.get( 'test.stale' ), 'string', 'In store' );
 945                         } )
 946                         .then( function () {
 947                                 // Reset run time, but keep mw.loader.store
 948                                 mw.loader.moduleRegistry[ 'test.stale' ].script = undefined;
 949                                 mw.loader.moduleRegistry[ 'test.stale' ].state = 'registered';
 950                                 mw.loader.moduleRegistry[ 'test.stale' ].version = 'v2';
 951
 952                                 // Module was stored correctly as v1
 953                                 // On future navigations, it will be ignored until evicted
 954                                 assert.strictEqual( mw.loader.store.get( 'test.stale' ), false, 'Not in store' );
 955                         } );
 956         } );
 957
 958         QUnit.test( 'Stale response caching - backcompat', function ( assert ) {
 959                 var script = 0;
 960                 // Enable store and stub timeout/idle scheduling
 961                 this.sandbox.stub( mw.loader.store, 'enabled', true );
 962                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
 963                         fn();
 964                 } );
 965                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
 966                         fn();
 967                 } );
 968
 969                 mw.loader.register( 'test.stalebc', 'v2' );
 970                 assert.strictEqual( mw.loader.store.get( 'test.stalebc' ), false, 'Not in store' );
 971
 972                 mw.loader.implement( 'test.stalebc', function () {
 973                         script++;
 974                 } );
 975
 976                 return mw.loader.using( 'test.stalebc' )
 977                         .then( function () {
 978                                 assert.strictEqual( script, 1, 'module script ran' );
 979                                 assert.strictEqual( mw.loader.getState( 'test.stalebc' ), 'ready' );
 980                                 assert.strictEqual( typeof mw.loader.store.get( 'test.stalebc' ), 'string', 'In store' );
 981                         } )
 982                         .then( function () {
 983                                 // Reset run time, but keep mw.loader.store
 984                                 mw.loader.moduleRegistry[ 'test.stalebc' ].script = undefined;
 985                                 mw.loader.moduleRegistry[ 'test.stalebc' ].state = 'registered';
 986                                 mw.loader.moduleRegistry[ 'test.stalebc' ].version = 'v2';
 987
 988                                 // Legacy behaviour is storing under the expected version,
 989                                 // which woudl lead to whitewashing and stale values (T117587).
 990                                 assert.ok( mw.loader.store.get( 'test.stalebc' ), 'In store' );
 991                         } );
 992         } );
 993
 994         QUnit.test( 'No storing of group=private responses', function ( assert ) {
 995                 var name = 'test.group.priv';
 996
 997                 // Enable store and stub timeout/idle scheduling
 998                 this.sandbox.stub( mw.loader.store, 'enabled', true );
 999                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
1000                         fn();
1001                 } );
1002                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
1003                         fn();
1004                 } );
1005
1006                 // See ResourceLoaderStartUpModule::$groupIds
1007                 mw.loader.register( name, 'x', [], 1 );
1008                 assert.strictEqual( mw.loader.store.get( name ), false, 'Not in store' );
1009
1010                 mw.loader.implement( name, function () {} );
1011                 return mw.loader.using( name ).then( function () {
1012                         assert.strictEqual( mw.loader.getState( name ), 'ready' );
1013                         assert.strictEqual( mw.loader.store.get( name ), false, 'Still not in store' );
1014                 } );
1015         } );
1016
1017         QUnit.test( 'No storing of group=user responses', function ( assert ) {
1018                 var name = 'test.group.user';
1019
1020                 // Enable store and stub timeout/idle scheduling
1021                 this.sandbox.stub( mw.loader.store, 'enabled', true );
1022                 this.sandbox.stub( window, 'setTimeout', function ( fn ) {
1023                         fn();
1024                 } );
1025                 this.sandbox.stub( mw, 'requestIdleCallback', function ( fn ) {
1026                         fn();
1027                 } );
1028
1029                 // See ResourceLoaderStartUpModule::$groupIds
1030                 mw.loader.register( name, 'y', [], 0 );
1031                 assert.strictEqual( mw.loader.store.get( name ), false, 'Not in store' );
1032
1033                 mw.loader.implement( name, function () {} );
1034                 return mw.loader.using( name ).then( function () {
1035                         assert.strictEqual( mw.loader.getState( name ), 'ready' );
1036                         assert.strictEqual( mw.loader.store.get( name ), false, 'Still not in store' );
1037                 } );
1038         } );
1039
1040         QUnit.test( 'mw.loader.store.init - Invalid JSON', function ( assert ) {
1041                 // Reset
1042                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1043                 this.sandbox.stub( mw.loader.store, 'items', {} );
1044                 this.resetStoreKey = true;
1045                 localStorage.setItem( mw.loader.store.key, 'invalid' );
1046
1047                 mw.loader.store.init();
1048                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1049                 assert.strictEqual(
1050                         $.isEmptyObject( mw.loader.store.items ),
1051                         true,
1052                         'Items starts fresh'
1053                 );
1054         } );
1055
1056         QUnit.test( 'mw.loader.store.init - Wrong JSON', function ( assert ) {
1057                 // Reset
1058                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1059                 this.sandbox.stub( mw.loader.store, 'items', {} );
1060                 this.resetStoreKey = true;
1061                 localStorage.setItem( mw.loader.store.key, JSON.stringify( { wrong: true } ) );
1062
1063                 mw.loader.store.init();
1064                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1065                 assert.strictEqual(
1066                         $.isEmptyObject( mw.loader.store.items ),
1067                         true,
1068                         'Items starts fresh'
1069                 );
1070         } );
1071
1072         QUnit.test( 'mw.loader.store.init - Expired JSON', function ( assert ) {
1073                 // Reset
1074                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1075                 this.sandbox.stub( mw.loader.store, 'items', {} );
1076                 this.resetStoreKey = true;
1077                 localStorage.setItem( mw.loader.store.key, JSON.stringify( {
1078                         items: { use: 'not me' },
1079                         vary: mw.loader.store.vary,
1080                         asOf: 130161 // 2011-04-01 12:00
1081                 } ) );
1082
1083                 mw.loader.store.init();
1084                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1085                 assert.strictEqual(
1086                         $.isEmptyObject( mw.loader.store.items ),
1087                         true,
1088                         'Items starts fresh'
1089                 );
1090         } );
1091
1092         QUnit.test( 'mw.loader.store.init - Good JSON', function ( assert ) {
1093                 // Reset
1094                 this.sandbox.stub( mw.loader.store, 'enabled', null );
1095                 this.sandbox.stub( mw.loader.store, 'items', {} );
1096                 this.resetStoreKey = true;
1097                 localStorage.setItem( mw.loader.store.key, JSON.stringify( {
1098                         items: { use: 'me' },
1099                         vary: mw.loader.store.vary,
1100                         asOf: Math.ceil( Date.now() / 1e7 ) - 5 // ~ 13 hours ago
1101                 } ) );
1102
1103                 mw.loader.store.init();
1104                 assert.strictEqual( mw.loader.store.enabled, true, 'Enabled' );
1105                 assert.deepEqual(
1106                         mw.loader.store.items,
1107                         { use: 'me' },
1108                         'Stored items are loaded'
1109                 );
1110         } );
1111
1112         QUnit.test( 'require()', function ( assert ) {
1113                 mw.loader.register( [
1114                         [ 'test.require1', '0' ],
1115                         [ 'test.require2', '0' ],
1116                         [ 'test.require3', '0' ],
1117                         [ 'test.require4', '0', [ 'test.require3' ] ]
1118                 ] );
1119                 mw.loader.implement( 'test.require1', function () {} );
1120                 mw.loader.implement( 'test.require2', function ( $, jQuery, require, module ) {
1121                         module.exports = 1;
1122                 } );
1123                 mw.loader.implement( 'test.require3', function ( $, jQuery, require, module ) {
1124                         module.exports = function () {
1125                                 return 'hello world';
1126                         };
1127                 } );
1128                 mw.loader.implement( 'test.require4', function ( $, jQuery, require, module ) {
1129                         var other = require( 'test.require3' );
1130                         module.exports = {
1131                                 pizza: function () {
1132                                         return other();
1133                                 }
1134                         };
1135                 } );
1136                 return mw.loader.using( [ 'test.require1', 'test.require2', 'test.require3', 'test.require4' ] ).then( function ( require ) {
1137                         var module1, module2, module3, module4;
1138
1139                         module1 = require( 'test.require1' );
1140                         module2 = require( 'test.require2' );
1141                         module3 = require( 'test.require3' );
1142                         module4 = require( 'test.require4' );
1143
1144                         assert.strictEqual( typeof module1, 'object', 'export of module with no export' );
1145                         assert.strictEqual( module2, 1, 'export a number' );
1146                         assert.strictEqual( module3(), 'hello world', 'export a function' );
1147                         assert.strictEqual( typeof module4.pizza, 'function', 'export an object' );
1148                         assert.strictEqual( module4.pizza(), 'hello world', 'module can require other modules' );
1149
1150                         assert.throws( function () {
1151                                 require( '_badmodule' );
1152                         }, /is not loaded/, 'Requesting non-existent modules throws error.' );
1153                 } );
1154         } );
1155
1156         QUnit.test( 'require() in debug mode', function ( assert ) {
1157                 var path = mw.config.get( 'wgScriptPath' );
1158                 mw.loader.register( [
1159                         [ 'test.require.define', '0' ],
1160                         [ 'test.require.callback', '0', [ 'test.require.define' ] ]
1161                 ] );
1162                 mw.loader.implement( 'test.require.callback', [ QUnit.fixurl( path + '/tests/qunit/data/requireCallMwLoaderTestCallback.js' ) ] );
1163                 mw.loader.implement( 'test.require.define', [ QUnit.fixurl( path + '/tests/qunit/data/defineCallMwLoaderTestCallback.js' ) ] );
1164
1165                 return mw.loader.using( 'test.require.callback' ).then( function ( require ) {
1166                         var cb = require( 'test.require.callback' );
1167                         assert.strictEqual( cb.immediate, 'Defined.', 'module.exports and require work in debug mode' );
1168                         // Must use try-catch because cb.later() will throw if require is undefined,
1169                         // which doesn't work well inside Deferred.then() when using jQuery 1.x with QUnit
1170                         try {
1171                                 assert.strictEqual( cb.later(), 'Defined.', 'require works asynchrously in debug mode' );
1172                         } catch ( e ) {
1173                                 assert.strictEqual( String( e ), null, 'require works asynchrously in debug mode' );
1174                         }
1175                 } );
1176         } );
1177
1178         QUnit.test( 'Implicit dependencies', function ( assert ) {
1179                 var user = 0,
1180                         site = 0,
1181                         siteFromUser = 0;
1182
1183                 mw.loader.implement(
1184                         'site',
1185                         function () {
1186                                 site++;
1187                         }
1188                 );
1189                 mw.loader.implement(
1190                         'user',
1191                         function () {
1192                                 user++;
1193                                 siteFromUser = site;
1194                         }
1195                 );
1196
1197                 return mw.loader.using( 'user', function () {
1198                         assert.strictEqual( site, 1, 'site module' );
1199                         assert.strictEqual( user, 1, 'user module' );
1200                         assert.strictEqual( siteFromUser, 1, 'site ran before user' );
1201                 } ).always( function () {
1202                         // Reset
1203                         mw.loader.moduleRegistry.site.state = 'registered';
1204                         mw.loader.moduleRegistry.user.state = 'registered';
1205                 } );
1206         } );
1207
1208         QUnit.test( '.getScript() - success', function ( assert ) {
1209                 var scriptUrl = QUnit.fixurl(
1210                         mw.config.get( 'wgScriptPath' ) + '/tests/qunit/data/mediawiki.loader.getScript.example.js'
1211                 );
1212
1213                 return mw.loader.getScript( scriptUrl ).then(
1214                         function () {
1215                                 assert.strictEqual( mw.getScriptExampleScriptLoaded, true, 'Data attached to a global object is available' );
1216                         }
1217                 );
1218         } );
1219
1220         QUnit.test( '.getScript() - failure', function ( assert ) {
1221                 assert.rejects(
1222                         mw.loader.getScript( 'https://example.test/not-found' ),
1223                         /Failed to load script/,
1224                         'Descriptive error message'
1225                 );
1226         } );
1227
1228 }() );