Test transition aborting

controllers.application.js

import Ember from 'ember';

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

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('checkout');
});

export default Router;

routes.checkout.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  beforeModel(transition) {
    Ember.Logger.log(transition);
    return new Ember.RSVP.Promise(function(resolve, reject) {      
      Ember.run.later(() => {
        Ember.Logger.log(transition);
        transition.abort();
        reject();
      }, 2000);
    });
    
  }
  
});

templates.application.hbs

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

templates.checkout.hbs

<h1>This is checkout</h1>

{{link-to 'GO BACK' 'index'}}

templates.index.hbs

{{link-to 'CHECKOUT' 'checkout'}}

templates.loading.hbs

<h1>LOADING!!!</h1>

twiddle.json

{
  "version": "0.8.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}