angular and coffeescript in rails

controllers.js

// app/assets/javascripts/ng_app/controllers.js
function PostListCtrl($scope) {
  $scope.posts = [
    { "title": "My First Post", "intro": "Subtitle of my post" },
    { "title": "Another Post", "intro": "Something interesting about this post" },
    { "title": "One More Thng", "intro": "There's always something more" }
  ]
}

// this runs correctly in the browser

controllers.js.coffee

# app/assets/javascripts/ng_app/controllers.js.coffee (replaces the js version)
app = angular.module 'myapp', []
$ -> 
  angular.bootstrap $("#myapp"), ["myapp"]
  
app.controller "PostListCtrl", ($scope) ->
  $scope.posts = [
    { "title": "My First Post", "intro": "Subtitle of my post" },
    { "title": "Another Post", "intro": "Something interesting about this post" },
    { "title": "One More Thng", "intro": "There's always something more" }
  ]

# note, I had to manually bootstrap it to get it to work
# on the page, replaced <div ng-app> with <div id="myapp">
# it runs correctly in the browser
# but the test reports
# ReferenceError: PostListCtrl is not defined in http://localhost:3000/assets/controllers_spec.js?body=1 (line 7)
# how do i get the tests to find it?

controllers_spec.coffee

# spec/javascripts/controllers_spec.coffee
describe 'myapp controllers', ->
  describe 'PostListCtrl', ->
    it 'creates "posts" model with 3 posts', ->
      scope = {}
      ctrl = new PostListCtrl(scope)
      expect(scope.posts.length).toBe(3)
      
# this passes