Has anyone successfully mocked the Socket class in .NET?

Question

I'm trying to mock out the System.net.Sockets.Socket class in C# - I tried using NUnit mocks but it can't mock concrete classes. I also tried using Rhino Mocks but it seemed to use a real version of the class because it threw a SocketException when Send(byte[]) was called. Has anyone successfully created and used a Socket mock using any mocking framework?

Answer 1

Whenever I run into these kinds of problems with Moq I end up creating an interface to abstract away the thing I can't mock.

So in your instance you might have an ISocket interface that implements the Send method. Then have your mocking framework mock that instead.

In your actual code, you'd have a class like this

public class MySocket : ISocket
{
  System.Net.Sockets.Socket _socket;

  public void MySocket(System.Net.Sockets.Socket theSocket)
  {
    _socket = theSocket;
  }

  public virtual void Send(byte[] stuffToSend)
  {
    _socket.Send(stuffToSend);
  }

}

Not sure if that meets your needs, but it's an option.