Coffee-Script Constructor

Coffeescript1

describe "constructor w/object", ->
    beforeEach ->
      @newUser = new User()

    it "should instantiate new user", ->
      (expect @newUser.firstName).toEqual 'Michael'

gistfile1.coffee

window.User = class User

  constructor: ->
    @firstName = ''
    $.getJSON "../user.json", (json) ->
      for myobj, myattrs of json
        @firstName = myattrs.firstName
        return console.log @firstName

console.log shows the firstName but my Jasmine test doesn't