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Ember Test Helpers
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```js | |
// x-img-test.js | |
import { module, test } from 'qunit'; | |
import { setupRenderingTest } from 'ember-qunit'; | |
import { render } from '@ember/test-helpers'; | |
import hbs from 'htmlbars-inline-precompile'; | |
module('Integration | Component | x-img', function(hooks) { | |
setupRenderingTest(hooks); | |
test('it renders', async function(assert) { | |
await render(hbs`{{x-img}}`); | |
let img = this.element.querySelector('img'); | |
// Next assertion will fail without either the following line, | |
// or a test waiter registered in the component: | |
// await waitUntil(() => img.complete); | |
assert.ok(img.complete, 'image has loaded'); | |
}); | |
}); | |
``` | |
```hbs | |
<img src={{src}}> | |
``` | |
```js | |
// components/x-img.js | |
import Component from '@ember/component'; | |
import Ember from 'ember'; | |
import { registerWaiter, unregisterWaiter } from '@ember/test'; | |
export default Component.extend({ | |
didInsertElement() { | |
this._super(...arguments); | |
if (Ember.testing) { | |
this._isComplete = () => this.element.querySelector('img').complete; | |
registerWaiter(this._isComplete); | |
} | |
}, | |
willDestroyElement() { | |
if (Ember.testing) { | |
unregisterWaiter(this._isComplete); | |
} | |
this._super(...arguments); | |
}, | |
src: "https://emberjs.com/images/tomsters/original-72df3a45.png" | |
}); | |
``` |
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