ember-concurrency issue

controllers.application.js

import Ember from 'ember';

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

controllers.my-controller.js

import Ember from 'ember';
import { task } from 'ember-concurrency';

export default Ember.Controller.extend({
  init() {
  	this._super(...arguments);
    
    this.get('myTask').perform();

  },
  
  myTask: task(function * () {
    yield;
  })
});

routes.my-route.js

import Ember from 'ember';
import { task } from 'ember-concurrency';

export default Ember.Route.extend({
  init() {
  	this._super(...arguments);
    
    this.get('myTask').perform();

  },
  
  myTask: task(function * () {
    yield;
  })
});

templates.application.hbs

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

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);

tests.unit.controllers.my-controller-test.js

import { moduleFor, test } from 'ember-qunit';

moduleFor('controller:my-controller', 'Unit | Controller | my-controller', {
});


test('it works without wrapping in a run', function(assert) {
  assert.expect(1);

  const controller = this.subject();
    
  assert.ok(true);
});


test('it works wrapping in a run', function(assert) {
  assert.expect(1);

  Ember.run(() => {
    const controller = this.subject();
    
    assert.ok(true);
  });
});

tests.unit.routes.my-route-test.js

import { moduleFor, test } from 'ember-qunit';

moduleFor('route:my-route', 'Unit | Route | my-route', {
});


test('it works without wrapping in a run', function(assert) {
  assert.expect(1);

  const controller = this.subject();
    
  assert.ok(true);
});


test('it works wrapping in a run', function(assert) {
  assert.expect(1);

  Ember.run(() => {
    const controller = this.subject();
    
    assert.ok(true);
  });
});

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.13.0",
    "ember-template-compiler": "2.13.0",
    "ember-testing": "2.13.0"
  },
  "addons": {
    "ember-data": "2.13.2",
    "ember-concurrency": "0.8.6"
  }
}