counter.Add(1) // account for unblocking the receive on doneCh
	close(doneCh)
	time.Sleep(time.Second) // give it a chance to misbehave
	goGetAndExpect(t, clock, counter, wr, gots, aval)
}
func TestCountingWriteOnceCancel(t *testing.T) {
	oldTime := time.Now()
	cval := &oldTime
	clock, counter := testeventclock.NewFake(oldTime, 0, nil)
	ctx, cancel := context.WithCancel(context.Background())
	var lock sync.Mutex