Rails/Js/AssetPipeline/Testing

html.erb

<# All $ ready moves to erb pages %>

<%= content_for :scripts %>
  $(function(){
    
    new LoginForm({form: $('#the-form')})
  
  });
<% end %>

login.js.coffee

#Classes take bare minimum and extract from there
class LoginForm
  constructor: (options)=>
    @form = options.form
    
    @submitButton = @form.find("#submit-button")
    
    @submitButton.on 'click', => @handleSubmit()
    
  handleSubmit: ->

login_spec.js.coffee

#specs override the instance variables as needed
describe 'LoginForm', ->
  loginForm = null
  form = null
  beforeEach ->
    form = $('<form/>')
    loginForm = new LoginForm(form)
    
  describe 'handleSubmit', ->
    it 'handles the submit' ->
      #send a stubbed button
      submitButton = $('<button>')
      loginForm.submitButton = submitButton
      
      loginForm.handleSubmit()
      
      expectSomeThingHere()