describe('compact', function()
  it('produces an error if its parent errors', function()
    local observable = Rx.Observable.fromValue(''):map(function(x) return x() end)
    expect(observable.subscribe).to.fail()
    expect(observable:compact().subscribe).to.fail()
  end)

  it('does not produce values that are false or nil', function()
    local observable = Rx.Observable.create(function(observer)
      observer:onNext(nil)
      observer:onNext(true)
      observer:onNext(false)
      observer:onNext('')
      observer:onNext(0)
      observer:onCompleted()
    end)

    expect(observable:compact()).to.produce(true, '', 0)
  end)
end)