cancelling Promise

controllers.application.js

import Ember from 'ember';
const { Object:EmObject, RSVP: { Promise } } = Ember;
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
	fun() { 
		return new Promise((resolve, reject) => {
			return resolve();
    });
  },
	one() {
		return this.fun().then(() => {
			debugger;
			console.log('one');
		//	return;
    });
  },
	two() {
		return this.one().then(()=> {
			console.log('two');
			//return;
    });
	},
 actions: {
	submit() {
		this.two().then(() => {
			console.log('three');
		});
	}
 }
	
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<button {{action 'submit'}}> submit </button>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}