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( function () { QUnit.module( 'mw.requestIdleCallback', QUnit.newMwEnvironment( { beforeEach: function () { var clock = this.clock = this.sandbox.useFakeTimers(); this.sandbox.stub( mw, 'now', function () { return Date.now(); } ); this.tick = function ( forward ) { return clock.tick( forward \|\| 1 ); }; // Always test the polyfill, not native this.sandbox.stub( mw, 'requestIdleCallback', mw.requestIdleCallbackInternal ); } } ) ); QUnit.test( 'callback', function ( assert ) { var sequence; mw.requestIdleCallback( function () { sequence.push( 'x' ); } ); mw.requestIdleCallback( function () { sequence.push( 'y' ); } ); mw.requestIdleCallback( function () { sequence.push( 'z' ); } ); sequence = []; this.tick(); assert.deepEqual( sequence, [ 'x', 'y', 'z' ] ); } ); QUnit.test( 'nested', function ( assert ) { var sequence; mw.requestIdleCallback( function () { sequence.push( 'x' ); } ); // Task Y is a task that schedules another task. mw.requestIdleCallback( function () { function other() { sequence.push( 'y' ); } mw.requestIdleCallback( other ); } ); mw.requestIdleCallback( function () { sequence.push( 'z' ); } ); sequence = []; this.tick(); assert.deepEqual( sequence, [ 'x', 'z' ] ); sequence = []; this.tick(); assert.deepEqual( sequence, [ 'y' ] ); } ); QUnit.test( 'timeRemaining', function ( assert ) { var sequence, tick = this.tick, jobs = [ { time: 10, key: 'a' }, { time: 20, key: 'b' }, { time: 10, key: 'c' }, { time: 20, key: 'd' }, { time: 10, key: 'e' } ]; mw.requestIdleCallback( function doWork( deadline ) { var job; while ( jobs[ 0 ] && deadline.timeRemaining() > 15 ) { job = jobs.shift(); tick( job.time ); sequence.push( job.key ); } if ( jobs[ 0 ] ) { mw.requestIdleCallback( doWork ); } } ); sequence = []; tick(); assert.deepEqual( sequence, [ 'a', 'b', 'c' ] ); sequence = []; tick(); assert.deepEqual( sequence, [ 'd', 'e' ] ); } ); if ( window.requestIdleCallback ) { QUnit.test( 'native', function ( assert ) { var done = assert.async(); // Remove polyfill and clock stub mw.requestIdleCallback.restore(); this.clock.restore(); mw.requestIdleCallback( function () { assert.expect( 0 ); done(); } ); } ); } }() );

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