Resolved issue of testing nested promises

unit-testing-promises.coffee

Q = require('q')
sinon = require('sinon')
sinonChai = require('sinon-chai')
chai.use(sinonChai)
sinon.should()

describe 'testing promises', ->
  aDeferred = Q.defer()
  bDeferred = Q.defer()

  moduleA =
    asyncMethodA: ->
      return aDeferred.promise
  moduleB = 
    asyncMethodB: ->
      return bDeferred.promise

  it 'should pass', ->

    sinon.spy moduleA, 'asyncMethodA'
    sinon.spy moduleB, 'asyncMethodB'

    aDeferred.resolve 'fooResolve'
    bDeferred.resolve 'barResolve'

    moduleA.asyncMethodA('foo')
      .then (value) ->
        console.log value
        return moduleB.asyncMethodB('bar')
      .then (value) ->
        console.log value
      .fail (err) ->
        err
      .done ->
        moduleA.asyncMethodA.should.have.been.called
        moduleB.asyncMethodB.should.have.been.called