New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  customService: Ember.inject.service('custom-service'),
  classNames: ['cursor-pointer'],

  clickListener: Ember.on('click', function(){
    this.get('customService').doSth();
    console.log('Click listener');
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

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

import { moduleForComponent, test } from 'ember-qunit';
import hbs from 'htmlbars-inline-precompile';

moduleForComponent('my-component', 'Testing doSth', {
  integration: true
});

test('should call doSth() on click', function(assert) {
  const customStub = Ember.Service.extend({
    doSth() {
      // whatever, state of the component does not change
      console.log('Stubbed doSth fired');
      assert.ok(true, 'Stubbed doSth fired');
    }
  });
  this.register('service:custom-service', customStub);
  this.inject.service('custom-service', { as: 'customService' });
  this.render(hbs`{{my-component}}`);
  this.$('.cursor-pointer').click(); // triggers clickListener() correctly
});

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}