New Twiddle

tests.helpers.destroy-app.js

import { run } from '@ember/runloop';

export default function destroyApp(application) {
  run(application, 'destroy');
}

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes.autoboot = true;
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.integration.components.my-exam1-test.js

import { render, click, find, findAll } from '@ember/test-helpers';
import { setupRenderingTest } from 'ember-qunit';
import { module, test } from 'qunit';
import hbs from 'htmlbars-inline-precompile';

import Component from '@ember/component';

// -------------------------------------------------------------------------
// Component

const TheComponent = Component.extend({
  message: null,

  actions: {
    // async tasks after user interactions (click, focus, mouseover...)
    doSomething() {
      setTimeout(() => {
        this.set('message', "Time's up! Let's do this");
      }, 100);
    }
  },

  didInsertElement() {
    this._super(...arguments);
    // async tasks after loading
    setTimeout(() => {
      this.set('message', 'To Be or Not to Be');
    }, 100);
  }
});

// -------------------------------------------------------------------------
// Template

const TheTemplate = hbs`
  <div id="my-exam1">
    <button id="do-something" {{action "doSomething"}}>Click me</button>
    <p id="message">{{message}}</p>
  </div>
`;

// -------------------------------------------------------------------------
// Test

module('Integration | Component | my-exam1', function(hooks) {
  setupRenderingTest(hooks);

  // Just a setup for demo. Please ignore it.
  hooks.beforeEach(function(assert) {
    this.owner.register('component:my-exam1', TheComponent);
    this.owner.register('template:components/my-exam1', TheTemplate);
  });

  // ember test-helpers only wait for the "settledness" metrics:
  // https://github.com/emberjs/ember-test-helpers/blob/master/API.md#getsettledstate
  // setTimeout is not belong to the "settledness" metrics.
  // So it will NOT wait setTimeout even we use await.
  test('it renders do-something button', async function(assert) {
    await render(hbs`{{my-exam1}}`);
    assert.equal(findAll('#do-something').length, 1);
  });

  test('do-something button works', async function(assert) {
    await render(hbs`{{my-exam1}}`);
    await click('#do-something');
    // Every DOM interaction helper returns a promise that resolves when settled.
    // If you use setTimeout, those helpers won't work for you.
    // https://github.com/emberjs/ember-test-helpers/blob/master/API.md#dom-interaction-helpers
    assert.equal(find('#message').textContent.trim(), "Time's up! Let's do this");
  });

  // Without waiting the pending timer correctly,
  // the test will fail other tests while the test suite is running.
  test('Not my fault. I am so well behaved', function(assert) {
    assert.ok(true);
  });
});

tests.test-helper.js

import Application from '../app';
import config from '../config/environment';
import { setApplication } from '@ember/test-helpers';
import { start } from 'ember-qunit';
import { assign } from '@ember/polyfills';

let attributes = assign({ rootElement: '#ember-testing', autoboot: false }, config.APP);
setApplication(Application.create(attributes));

start();

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2",
    "ember-lifeline": "3.1.1",
    "ember-fetch": "6.4.0",
    "ember-cli-pretender": "3.0.0"
  }
}