Unit Test - Test

controllers.application.js

import Ember from 'ember';

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

models.comment.js

import DS from 'ember-data';

export default DS.Model.extend({
  post: DS.belongsTo()
});

models.post.js

import DS from 'ember-data';

export default DS.Model.extend({
  comments: DS.hasMany(),
  
  destroy() {
   this.get('comments').forEach(c => 	c.destroyRecord());
  }
});

templates.application.hbs

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

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.test-helper.js

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

setResolver(resolver);

tests.unit.models.post-test.js

import Ember from 'ember';
import { moduleForModel, test } from 'ember-qunit';
const { run } = Ember;

moduleForModel('post', 'Unit | Model | post', {
  needs: [
    'model:comment'
  ]
});

test('destoyring a post should also destroy comments', function(assert) {
  let model = this.subject();
  let store = this.store();
	
  run(function() {
	  let comment = store.createRecord('comment', {post:model});
    assert.equal(store.peekAll('comment').get('length'), 1);

    model.destroy();
		
    let validComments = store.peekAll('comment')
    	.filter(c => !c.get('isDeleted'))
    
    assert.equal(validComments.length, 0);
  });
});

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}