// Record all droppeded requests and recompute retryAfter.
		for r := 0; r < step.droppedRequests; r++ {
			tracker.RecordDroppedRequest("pl")
		}
		if retryAfter := tracker.GetRetryAfter("pl"); retryAfter != step.retryAfter {
			t.Errorf("Unexpected retryAfter: %v, expected: %v", retryAfter, step.retryAfter)
		}

	}
}

func TestDroppedRequestsTrackerPLIndependent(t *testing.T) {

type DroppedRequestsTracker interface {
	// RecordDroppedRequest records a request that was just
	// dropped from processing.
	RecordDroppedRequest(plName string)

	// GetRetryAfter returns the current suggested value of
	// RetryAfter value.
	GetRetryAfter(plName string) int64
}

// unixStat keeps a statistic how many requests were dropped within
// a single second.
type unixStat struct {
	unixTime int64
	requests int64
}

		//  number, just return the truncated result and sleep the remainder server-side.
		tooManyRequests(r, w, strconv.Itoa(int(h.droppedRequests.GetRetryAfter(classification.PriorityLevelName))))
	}
}

// WithPriorityAndFairness limits the number of in-flight
// requests in a fine-grained way.
func WithPriorityAndFairness(
	handler http.Handler,