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/* eslint-env qunit */
import EventTarget from '../../src/js/event-target.js';
import sinon from 'sinon';
const { test } = QUnit;
QUnit.module('EventTarget', {
beforeEach() {
this.clock = sinon.useFakeTimers();
},
afterEach() {
this.clock.restore();
}
});
test('EventTarget queueTrigger queues the event', function(t) {
const et = new EventTarget();
let changes = 0;
const changeHandler = function() {
changes++;
};
et.on('change', changeHandler);
et.queueTrigger('change');
t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
this.clock.tick(1);
t.equal(changes, 1, 'EventTarget triggered a change event once the clock ticked');
et.off('change', changeHandler);
});
test('EventTarget will only trigger event once with queueTrigger', function(t) {
const et = new EventTarget();
let changes = 0;
const changeHandler = function() {
changes++;
};
et.on('change', changeHandler);
et.queueTrigger('change');
t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
et.queueTrigger('change');
t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
et.queueTrigger('change');
t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
et.queueTrigger('change');
this.clock.tick(100);
t.equal(changes, 1, 'EventTarget *only* triggered a change event once');
et.off('change', changeHandler);
});
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