Testing Ember (v1.0.0-rc.3) nested controllers using Mocha and Chai - ember.js

Question

I am trying to write test cases for controllers of an Ember (v1.0.0-rc.3) Application using Mocha and Chai. One of my controller is making use of another controller as follows
App.ABCController = Em.ObjectController.extend({
needs: ['application'],
welcomeMSG: function () {
return 'Hi, ' + this.get('controllers.application.name');
}.property(),
...
});
I wrote testCase as below:
describe 'ABCController', ->
expect = chai.expect
App = require '../support/setup'
abcController = null
before ->
App.reset()
ApplicationController = require 'controllers/application_controller'
ABCController = require 'controllers/abc_controller'
applicationController = ApplicationController.create()
abcController = ABCController.create()
describe '#welcomeMSG', ->
it 'should return Hi, \'user\'.', ->
msg = abcController.get('welcomeMSG')
expect(msg).to.be.equal('Hi, '+ applicationController.get('name'))
support/setup file is as follows
Em.testing = true
App = null
Em.run ->
App = Em.Application.create()
module.exports = App
Now whenever i try to run testcase i face error
"Before all" hook:
TypeError: Cannot call method 'has' of null
at verifyDependencies (http://localhost:3333/test/scripts/ember.js:27124:20)
at Ember.ControllerMixin.reopen.init (http://localhost:3333/test/scripts/ember.js:27141:9)
at superWrapper [as init] (http://localhost:3333/test/scripts/ember.js:1044:16)
at new Class (http://localhost:3333/test/scripts/ember.js:10632:15)
at Function.Mixin.create.create (http://localhost:3333/test/scripts/ember.js:10930:12)
at Function.Ember.ObjectProxy.reopenClass.create (http://localhost:3333/test/scripts/ember.js:11756:24)
at Function.superWrapper (http://localhost:3333/test/scripts/ember.js:1044:16)
at Context.eval (test/controllers/abc_controller_test.coffee:14:47)
at Hook.Runnable.run (test/vendor/scripts/mocha-1.8.2.js:4048:32)
at next (test/vendor/scripts/mocha-1.8.2.js:4298:10)
Please help me to resolve this issue. I will appreciate if someone provide me few links where i can study for latest ember.js application testing with mocha and chai.

Answer 1

Reading trough the docs I guess your problem is that your expect fails due to this to.be.equal. Try changing the assertion chain to this:
expect(msg).to.equal('Hi, '+ applicationController.get('name'))
Update
After reading your comment I guess the problem in your case is that when you do Ember.testing = true is equivalent to the before needed App.deferReadiness(), so it' obviously necessary to 'initialize' your App before using it, this is done with App.initialize() inside your global before hook. And lastly you call App.reset() inside your beforeEach hook's.
Please check also this blog post for more info on the update that introduced this change.
Hope it helps