thing

components.my-pokemon.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.name = 'Pikachu';	
  },
  
  pokemon: Ember.computed('name', function() {
    let url = `https://pokeapi.co/api/v2/pokemon/${this.get('name')}`.toLowerCase();
    
		return fetch(url).then(req => req.json());
  }).readOnly(),
  
  actions: {
	  changePokemon(name) {
      this.set('name', name);	
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  name: 'pikachu'
});

templates.application.hbs

{{my-pokemon}}

templates.components.my-pokemon.hbs

<input value={{name}}
       placeholder="Pokemon name"
       onchange={{action 'changePokemon' value="target.value"}}>
       
{{#if (is-pending pokemon)}}
  <div>loading...</div>
{{else if (is-rejected pokemon)}}  
  <div>something went wrong...</div>
{{else}}
	<img src="{{get (await pokemon) 'sprites.front_default'}}">
{{/if}}  

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": "0.10.6",
  "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": {
    "ember-promise-helpers": "1.0.2"
  }
}