public void Receive_Fires_ReceivedMessage()
{
var tcs = new TaskCompletionSource <ReceivedMessageEventArgs>();
_sut.ReceivedMessage += (s, e) => {
tcs.SetResult(e);
};
SendTestMessage();
_sut.Receive();
tcs.Task.Wait();
Assert.IsNotNull(tcs.Task.Result.Message);
}