}

	// Verify no outstanding requests after readLoop/writeLoop
	// goroutines shut down.
	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
		n := tr.NumPendingRequestsForTesting()
		if n > 0 {
			if d > 0 {
				t.Logf("pending requests = %d after %v (want 0)", n, d)
			}
			return false
		}
		return true
	})
}