Ensure the done() callback is being called in this test

it 'computes correctly when on & off have a list at cronRange[4]', ->
    @component.set('cronRanges', [Ember.Object.create({
      on: "* * * 3 3,1,5"
      off: "* * * 3 3,1,5"
    })])
    @component.set('dayOfWeek', 2)
    expect(@component.get('inRange')).to.be.false
    @component.set('dayOfWeek', 5)
    expect(@component.get('inRange')).to.be.true
    @component.set('dayOfWeek', 1)
    expect(@component.get('inRange')).to.be.true
    @component.set('dayOfWeek', 3)
    expect(@component.get('inRange')).to.be.true

this is an ember unit test that fails with the error that is the is the title of this question.