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ScrollEndEventEmitter.test.js
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ScrollEndEventEmitter.test.js
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const
sinon = require( 'sinon' ),
oo = require( '../utils/oo' );
let
sandbox,
ScrollEndEventEmitter;
QUnit.module( 'MobileFrontend ScrollEndEventEmitter.js', {
beforeEach: function () {
sandbox = sinon.sandbox.create();
oo.setUp( sandbox, global );
ScrollEndEventEmitter = require( '../../../src/mobile.special.watchlist.scripts/ScrollEndEventEmitter' );
},
afterEach: function () {
sandbox.restore();
}
} );
QUnit.test( 'initializes properly', function ( assert ) {
const
eventBus = {
on: sinon.spy()
},
is = new ScrollEndEventEmitter( eventBus, 500 ),
is2 = new ScrollEndEventEmitter( eventBus );
assert.strictEqual( is.enabled, true,
'Emission is enabled by default' );
assert.strictEqual( is.threshold, 500, 'Threshold is saved' );
assert.strictEqual( is2.threshold, 100,
'Without a threshold we get a default' );
assert.strictEqual( eventBus.on.withArgs( 'scroll:throttled',
is._scrollHandler ).calledOnce, true, 'Scrolling handler is bound' );
} );
QUnit.test( 'emits scroll end event', function ( assert ) {
const
eventBus = {
on: function ( _, handler ) {
this.handler = handler;
},
off: function () {}
},
is = new ScrollEndEventEmitter( eventBus );
// stub scrollNearEnd method because headless tests don't support scrolling
sandbox.stub( is, 'scrollNearEnd' ).returns( true );
is.setElement( {} );
is.on( ScrollEndEventEmitter.EVENT_SCROLL_END, function () {
assert.true( true, 'scroll end event emitted' );
} );
// trigger stubbed 'scroll:throttled' event
eventBus.handler();
} );
QUnit.test( 'doesn\'t emit when disabled', function ( assert ) {
const
emitSpy = sandbox.spy( ScrollEndEventEmitter.prototype, 'emit' ),
eventBus = {
on: function ( _, handler ) {
this.handler = handler;
},
off: function () {}
},
is = new ScrollEndEventEmitter( eventBus );
is.setElement( {} );
is.disable();
// trigger stubbed 'scroll:throttled' event
eventBus.handler();
assert.strictEqual( emitSpy.called, false, 'emit should not be called' );
} );

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