TEST LIFECYCLE

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  computed: Ember.computed(function() {
    console.log('I was computed');
    return 'on compute me';
  }),
  
  _onDidReceiveAttrs: Ember.on('didReceiveAttrs', function () {
    console.log(`COMPUTED ${this.get('computed')}`);
    console.log('on didReceiveAttrs');
  }),
  
  _onInitAttrs: Ember.on('init', function () {
    console.log('on Init');
  }),
  
  init() {
    this._super(...arguments);
    console.log('Init function');
  },
  
  didReceiveAttrs() {
    console.log('didReceiveAttrs function');
    this._super(...arguments);
  } 
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  
});

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

{{computed}}

tests.helpers.destroy-app.js

import Ember from 'ember';

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

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

setResolver(resolver);

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.4.5",
    "ember-template-compiler": "2.4.5",
    "ember-testing": "2.4.5"
  },
  "addons": {
    "ember-data": "2.3.3"
  }
}