How to test javascript geolocation with jasmine

geolocation-spec.js.coffee

#= require support/jasmine-given

class Geolocation
  getCurrentPosition: ->
    options =
      maximumAge: 0
      timeout: 1*10*1000
      enableHighAccuracy: true

    navigator.geolocation.getCurrentPosition(@success, @failure, options)

  success: (position) =>
    @coordinates = position.coords

  failure: (error) =>
    @coordinates = null

describe "Geolocation", ->
  Given -> @subject = new Geolocation()
  Given -> @spy = spyOn(navigator.geolocation, 'getCurrentPosition')
  When  -> @subject.getCurrentPosition()

  describe "#getCurrentPosition", ->
    describe "success", ->
      Given -> @spy.andCallFake(-> arguments[0](coords: { latitude: 1, longitude: 2 }))
      Then  -> expect(@subject.coordinates).toEqual({latitude: 1, longitude: 2})

    describe "failure", ->
      Given -> @spy.andCallFake(-> arguments[1]({error: "FAILED"}))
      Then  -> @subject.coordinates is null