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track.test.js
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track.test.js
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QUnit.module( 'mediawiki.base/track', () => {
QUnit.test( 'track', ( assert ) => {
const sequence = [];
mw.trackSubscribe( 'test.single', ( topic, data ) => {
sequence.push( [ topic, data ] );
} );
mw.track( 'test.single', { key: 1 } );
mw.track( 'test.single', { key: 2 } );
assert.deepEqual( sequence, [
[ 'test.single', { key: 1 } ],
[ 'test.single', { key: 2 } ]
], 'Events after subscribing' );
sequence.length = 0;
mw.trackSubscribe( 'test.multi', ( topic, num, options = {} ) => {
sequence.push( [ num, options ] );
} );
mw.track( 'test.multi', 42 );
mw.track( 'test.multi', 12, { name: 'Foo' } );
assert.deepEqual( sequence, [
[ 42, {} ],
[ 12, { name: 'Foo' } ]
] );
} );
QUnit.test( 'trackSubscribe', ( assert ) => {
const sequence = [];
let thisValue;
mw.track( 'before', { key: 1 } );
mw.track( 'before', { key: 2 } );
mw.trackSubscribe( 'before', function ( topic, data ) {
'use strict';
sequence.push( [ topic, data ] );
thisValue = this;
} );
mw.track( 'before', { key: 3 } );
assert.deepEqual( sequence, [
[ 'before', { key: 1 } ],
[ 'before', { key: 2 } ],
[ 'before', { key: 3 } ]
], 'Replay events from before subscribing' );
assert.strictEqual( thisValue, undefined, 'thisValue' );
} );
QUnit.test( 'trackUnsubscribe', ( assert ) => {
const sequence = [];
function unsubber( topic, data ) {
sequence.push( [ topic, data ] );
}
mw.track( 'unsub', { key: 1 } );
mw.trackSubscribe( 'unsub', unsubber );
mw.track( 'unsub', { key: 2 } );
mw.trackUnsubscribe( unsubber );
mw.track( 'unsub', { key: 3 } );
assert.deepEqual( sequence, [
[ 'unsub', { key: 1 } ],
[ 'unsub', { key: 2 } ]
], 'Stop when unsubscribing' );
} );
QUnit.test( 'trackError', function ( assert ) {
const fn = mw.track;
function logError( topic, data ) {
assert.step( typeof data === 'string' ? data : JSON.stringify( data ) );
}
this.sandbox.stub( console, 'log' );
// Simulate startup time
mw.track = undefined;
assert.step( 'emit1' );
mw.trackError( 'foo' );
// Simulate mediawiki.base arriving
mw.track = fn;
assert.step( 'sub' );
mw.trackSubscribe( 'resourceloader.exception', logError );
assert.step( 'emit2' );
mw.trackError( 'bar' );
assert.verifySteps( [
'emit1',
'sub',
'foo',
'emit2',
'bar'
] );
// Teardown
mw.trackUnsubscribe( logError );
} );
} );

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