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mw.requestIdleCallback.test.js
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mw.requestIdleCallback.test.js
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( function () {
QUnit.module( 'mw.requestIdleCallback', QUnit.newMwEnvironment( {
beforeEach: function () {
const clock = this.clock = this.sandbox.useFakeTimers();
this.sandbox.stub( mw, 'now', () => 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 ) {
const sequence = [];
mw.requestIdleCallback( () => {
sequence.push( 'x' );
} );
mw.requestIdleCallback( () => {
sequence.push( 'y' );
} );
mw.requestIdleCallback( () => {
sequence.push( 'z' );
} );
this.tick();
assert.deepEqual( sequence, [ 'x', 'y', 'z' ] );
} );
QUnit.test( 'nested', function ( assert ) {
let sequence;
mw.requestIdleCallback( () => {
sequence.push( 'x' );
} );
// Task Y is a task that schedules another task.
mw.requestIdleCallback( () => {
function other() {
sequence.push( 'y' );
}
mw.requestIdleCallback( other );
} );
mw.requestIdleCallback( () => {
sequence.push( 'z' );
} );
sequence = [];
this.tick();
assert.deepEqual( sequence, [ 'x', 'z' ] );
sequence = [];
this.tick();
assert.deepEqual( sequence, [ 'y' ] );
} );
QUnit.test( 'timeRemaining', function ( assert ) {
let sequence;
const 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 ) {
let 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 ) {
const done = assert.async();
// Remove polyfill and clock stub
mw.requestIdleCallback.restore();
this.clock.restore();
mw.requestIdleCallback( () => {
assert.expect( 0 );
done();
} );
} );
}
}() );

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