private async Task SetupAsync()
{
TransportListener = CreateTransportListener();
await TransportListener.StartAsync(CancellationToken);
var serverTcpTransportTask = TransportListener.AcceptTransportAsync(CancellationToken);
ClientTransport = CreateClientTransport();
await ClientTransport.OpenAsync(Uri, CancellationToken);
SynchronizedClientTransport = new SynchronizedTransportDecorator(ClientTransport);
ServerTransport = await serverTcpTransportTask;
await ServerTransport.OpenAsync(Uri, CancellationToken);
SynchronizedServerTransport = new SynchronizedTransportDecorator(ServerTransport);
Message = Dummy.CreateMessage(Dummy.CreateTextContent());
}