st, err := remoteConn.NewStream(ctx, handler, []byte(testPayload))
		errFatal(err)
		clientCanceled := make(chan time.Duration, 1)
		go func() {
			started := time.Now()
			for resp := range st.responses {
				err = resp.Err
			}
			clientCanceled <- time.Since(started)
		}()
		serverEnd := <-serverCanceled
		clientEnd := <-clientCanceled
		t.Log("server cancel time:", serverEnd)
		t.Log("client cancel time:", clientEnd)