case <-time.After(10 * time.Second):
			t.Fatal("deadlock")
		}
	}

	// Also test CloseWrite being called before the handshake is
	// finished:
	{
		ln2 := newLocalListener(t)
		defer ln2.Close()

		netConn, err := net.Dial("tcp", ln2.Addr().String())
		if err != nil {
			t.Fatal(err)
		}
		defer netConn.Close()
		conn := Client(netConn, testConfig.Clone())