New Twiddle

router.js

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

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

Router.map(function() {
  this.route('home', {path: '/'}, function(){
    this.route('check-permission', {path:'cb'}, function() {
      this.route('admin')
      this.route('pleb')
    })
  })
});

export default Router;

routes.admin.js

import Ember from 'ember';

export default Ember.Route.extend({
});

routes.check-permission.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel(){
    console.log('bm')
    if(Math.floor(Math.random() * Math.floor(2)) === 0){
      this.transitionTo('home.check-permission.admin') 
    } else {
      this.transitionTo('home.check-permission.pleb')
    }
  }
});

routes.home.js

import Ember from 'ember';

export default Ember.Route.extend({
});

routes.pleb.js

import Ember from 'ember';

export default Ember.Route.extend({
});

templates.admin.hbs

Welcome master

templates.check-permission.hbs

<span>Did it fail: {{outlet}}</span>
{{#link-to "home"}}}Go Back{{/link-to}}

templates.home.hbs

{{#link-to "home.check-permission"}}Check permission{{/link-to}}
{{outlet}}

templates.pleb.hbs

Pleb...

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": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}