Sinon's time freezing is destroyed by Sugar.js

date_helper.coffee

exports.DateHelper = {
  lock: (msSinceEpoc) ->
    # NOTE: Needed because Calendar model expects moment in the global scope.
    global.moment = require('moment')

    # NOTE: This can be removed once Sugar.js is removed
    dateSugar = Date.SugarMethods
    clock = sinon.useFakeTimers(msSinceEpoc)
    # NOTE: This can be removed once Sugar.js is removed
    Date[k] = v.method for k,v of dateSugar

    originalCreate = Date.create
    @createStub = sinon.stub(Date, 'create', (dateString) -> if dateString then originalCreate(dateString) else new Date())

    clock

  unlock: (clock) ->
    global.moment = null
    clock.restore()
    @createStub.restore()
}

date_test.coffee

QUnit.module 'Brilliant.Calendar'
  setup: ->
    @clock = DateHelper.lock(+new Date(2012, 9, 7))

    @getEventsStub = sinon.stub(app.Calendar.prototype, 'getEvents')

  teardown: ->
    @getEventsStub.restore()

    DateHelper.unlock(@clock)