return ie.GetHeartbeatEvent().(*events.Heartbeat)
}

var _ = Describe("InstrumentedEmitter", func() {
	var fakeEmitter *fake.FakeByteEmitter
	var instrumentedEmitter emitter.InstrumentedEmitter

	BeforeEach(func() {
		fakeEmitter = fake.NewFakeByteEmitter()
		instrumentedEmitter, _ = emitter.NewInstrumentedEmitter(fakeEmitter)
	})

	Describe("Delegators", func() {

		It("delegates Close() to the concreteEmitter", func() {
			instrumentedEmitter.Close()
			Eventually(fakeEmitter.IsClosed).Should(BeTrue())
		})
	})

	Describe("Emit()", func() {
		var testData = []byte("hello")

		It("calls the concrete emitter", func() {
			Expect(fakeEmitter.Messages).To(HaveLen(0))

			err := instrumentedEmitter.Emit(testData)
			Expect(err).ToNot(HaveOccurred())

			Expect(fakeEmitter.Messages).To(HaveLen(1))
			Expect(fakeEmitter.Messages[0]).To(Equal(testData))