  void expectHandshakeError() {
    EXPECT_TRUE(client->except.hasValue())
        << "Expected client handshake error!";
    EXPECT_TRUE(server->except.hasValue())
        << "Expected server handshake error!";
  }
  void expectHandshakeError() {
    EXPECT_TRUE(client->except.hasValue())
        << "Expected client handshake error!";
    EXPECT_TRUE(server->except.hasValue())
        << "Expected server handshake error!";
  }