func sleepForIncrements(timeService *fakeclock.FakeClock, attempts int, delay time.Duration) {
	for i := 0; i < attempts; i++ {
		Eventually(timeService.WatcherCount).Should(Equal(1))
		timeService.Increment(delay)
		Eventually(timeService.WatcherCount).Should(Equal(0))
	}
}
func incrementSleepInBackground(fakeTimeService *fakeclock.FakeClock, delay time.Duration) chan struct{} {
	doneChan := make(chan struct{})
	go func() {
		for {
			select {
			case <-doneChan:
				return
			default:
				if fakeTimeService.WatcherCount() > 0 {
					fakeTimeService.Increment(delay)
					Eventually(fakeTimeService.WatcherCount).Should(Equal(0))
				}
			}
		}
	}()
	return doneChan
}
var _ = Describe("FakeClock", func() {
	const Δ time.Duration = 10 * time.Millisecond

	var (
		fakeClock   *fakeclock.FakeClock
		initialTime time.Time
	)

	BeforeEach(func() {
		initialTime = time.Date(2014, 1, 1, 3, 0, 30, 0, time.UTC)
		fakeClock = fakeclock.NewFakeClock(initialTime)
	})

	Describe("Now", func() {
		It("returns the current time, w/o race conditions", func() {
			go fakeClock.Increment(time.Minute)
			Eventually(fakeClock.Now).Should(Equal(initialTime.Add(time.Minute)))
		})
	})

	Describe("Sleep", func() {
		It("blocks until the given interval elapses", func() {
			doneSleeping := make(chan struct{})
			go func() {
				fakeClock.Sleep(10 * time.Second)
				close(doneSleeping)
			}()

			Consistently(doneSleeping, Δ).ShouldNot(BeClosed())

			fakeClock.Increment(5 * time.Second)
	const Δ = 10 * time.Millisecond

	var (
		fakeClock   *fakeclock.FakeClock
		initialTime time.Time
	)

	BeforeEach(func() {
		initialTime = time.Date(2014, 1, 1, 3, 0, 30, 0, time.UTC)
		fakeClock = fakeclock.NewFakeClock(initialTime)
	})

	It("proivdes a channel that receives after the given interval has elapsed", func() {
		timer := fakeClock.NewTimer(10 * time.Second)
		timeChan := timer.C()
		Consistently(timeChan, Δ).ShouldNot(Receive())

		fakeClock.Increment(5 * time.Second)
		Consistently(timeChan, Δ).ShouldNot(Receive())

		fakeClock.Increment(4 * time.Second)
		Consistently(timeChan, Δ).ShouldNot(Receive())

		fakeClock.Increment(1 * time.Second)
		Eventually(timeChan).Should(Receive(Equal(initialTime.Add(10 * time.Second))))

		fakeClock.Increment(10 * time.Second)
		Consistently(timeChan, Δ).ShouldNot(Receive())
	})
})
					Expect(retryable.Response().Body.(ClosedChecker).Closed()).To(BeTrue())
				})
			})
		})

		It("waits for retry delay between retries", func() {
			for i := 0; i < maxUnavailableAttempts+maxOtherAttempts; i++ {
				retryable.AddAttemptBehavior(unavailable, true, nil)
			}

			go func() {
				monitRetryStrategy.Try()
			}()

			Eventually(retryable.Attempts).Should(Equal(1))
			timeService.Increment(delay - time.Millisecond)
			Consistently(retryable.Attempts).Should(Equal(1))
			timeService.Increment(2 * time.Millisecond)
			Eventually(retryable.Attempts).Should(Equal(2))
		})

		Context("when error is not due to failed response", func() {
			It("retries until maxOtherAttempts are exhausted", func() {
				for i := 0; i < maxOtherAttempts-1; i++ {
					retryable.AddAttemptBehavior(nil, true, errors.New("request error"))
				}
				retryable.AddAttemptBehavior(nil, true, lastError)

				errChan := tryInBackground(monitRetryStrategy)

				sleepForIncrements(timeService, maxOtherAttempts, delay)