checking notifyPropertyChange behavior

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    'click first' () {
      this.get('dog').notifyFirst()
    },
    
    'click second' () {
      this.get('dog').notifySecond()
    },
    
    'click third' () {
      this.get('dog').notifyThird()
    },
  }
});

controllers.application.js

import Ember from 'ember';

const Dog = Ember.Object.extend({
  init() {
    this._super(...arguments)
    
    let b = Ember.Object.create({ baz: 4 })
    let c = Ember.Object.create({ bar: b })
    Ember.set(this, 'foo', c)

  },
  
  notifyFirst() {
    console.log('click first')
    this.notifyPropertyChange('foo')
  },
  
  notifySecond() {
    console.log('click second')
    this.notifyPropertyChange('foo.bar')
  },
  
  notifyThird() {
    console.log('click third')
    this.notifyPropertyChange('foo.bar.baz')
  },
})

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  dog: Dog.create(),
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{my-component dog=dog}}

templates.components.my-component.hbs

{{yield}}
<button type="button" onclick={{action 'click first'}}>some button</button>
<button type="button" onclick={{action 'click second'}}> button</button>
<button type="button" onclick={{action 'click third'}}>some button</button>

{{log 'dog:' dog}}
{{log 'dog.foo:' dog.foo}}
{{log 'dog.foo.bar:' dog.foo.bar}}
{{log 'dog.foo.bar.baz:' dog.foo.bar.baz}}

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": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}