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 see

Answer 1

The above class only Mocks your Send Method. This actually mocks a Socket. It Inherits all of Socket and then Implements the ISocket interface. ISocket needs to implement the signatures of any Socket methods or properties you need to mock

//internal because only used for test code
internal class SocketWrapper : Socket, ISocket
{
    /// 

    /// Web Socket
    /// 
    public SocketWrapper():base(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
    {
    }

    //use all features of base Socket
}

The interface looks like this with two methods declined:

public interface ISocket
{
    void Connect(IPAddress address, int port);
    int Send(byte[] buffer, int offset, int size, SocketFlags socketFlags, out SocketError errorCode);
}

The Class that uses them has 2 constructors. One injects an ISocket for testing and then one that makes it's own Socket that the application uses.

public class HTTPRequestFactory3
{
internal ISocket _socket;


    /// 

    /// Creates a socket and sends/receives information.  Used for mocking to inject ISocket
    /// 
    internal HTTPRequestFactory3(ISocket TheSocket)
    {
     _socket = TheSocket as ISocket;
     this.Setup();
    }

    /// 

    /// Self Injects a new Socket.
    /// 
    public  HTTPRequestFactory3()
    {
        SocketWrapper theSocket = new SocketWrapper();
        _socket = theSocket as ISocket;
        this.Setup();
    }
}

Then your tests can create a ISocket, set up expectations and verify them running all the same code the above class will use with a real socket. This test validates that section code.

   [Test]
   public void NewSocketFactoryCreatesSocketDefaultConstructor()
        {
            webRequestFactory = new HTTPRequestFactory3();
            Assert.NotNull(webRequestFactory._socket);
            Socket testSocket = webRequestFactory._socket as Socket;
            Assert.IsInstanceOf(testSocket);
        }