Component helper action test

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['my-component']
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    doSomething() {
      console.log('Doing something...'); 
    }
  }
});

templates.application.hbs

{{my-component onSomething=(action "doSomething")}}

{{component "my-component" onSomething=(action "doSomething")}}

templates.components.my-component.hbs

<div class="my-component-something" onclick={{action @onSomething}}>Something</div>

tests.acceptance.my-acceptance-test.js

import { test } from 'qunit';
import moduleForAcceptance from '../../tests/helpers/module-for-acceptance';

moduleForAcceptance('component helper actions');

test('visiting /', function(assert) {
  visit('/');

  andThen(function() {
    assert.equal(currentURL(), '/');
  });
  
  click(`
    .my-component:nth-child(1)
    .my-component-something
  `);
  
	click(`
    .my-component:nth-child(2)
    .my-component-something
  `);
});

tests.helpers.destroy-app.js

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

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

tests.helpers.module-for-acceptance.js

import { module } from 'qunit';
import { resolve } from 'rsvp';
import startApp from '../helpers/start-app';
import destroyApp from '../helpers/destroy-app';

export default function(name, options = {}) {
  module(name, {
    beforeEach() {
      this.application = startApp();

      if (options.beforeEach) {
        return options.beforeEach.apply(this, arguments);
      }
    },

    afterEach() {
      let afterEach = options.afterEach && options.afterEach.apply(this, arguments);
      return resolve(afterEach).then(() => destroyApp(this.application));
    }
  });
}

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.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: '#main' }, 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"
  }
}