Question

I’m trying to use Moles to mock the Socket class in System.Net.Sockets. I have successfully generated the .moles file and building it did add a System.Net.Moles assembly to my references but It dose not generate the MSocket class. In fact only the MIPEndPointCollection class is generated.

Here is a sample class that uses System.Net.Sockets.Socket:

using System.Text;
using System.Net.Sockets;

namespace MyProject
{
    public static class Communicator
    {
        public static int Send(string messages)
        {
            byte[] bytes = Encoding.ASCII.GetBytes(messages);
            int bytesSent = 0;
            using (Socket socket = new Socket(AddressFamily.InterNetwork,
                SocketType.Stream, ProtocolType.Tcp))
            {
                socket.Connect("localhost", 1234);
                bytesSent = socket.Send(bytes);
            }

            return bytesSent;
        }
    }
}

A dumy test class:

using MyProject;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Net.Moles;
using Microsoft.Moles.Framework;

[assembly: MoledType(typeof(System.Net.Sockets.Socket))]

namespace MyProjectTest
{
    [TestClass()]
    public class CommunicatorTest
    {
        private TestContext testContextInstance;
        public TestContext TestContext
        {
            get { return testContextInstance; }
            set { testContextInstance = value; }
        }

        [TestMethod()]
        [HostType("Moles")]
        public void SendTest()
        {
            //dose not exist in the System.Net.Moles namespace:
            //MSocket.Send = deligate(){ return 0; };
            int bytesSent = Communicator.Send("Test Message");
            Assert.AreEqual(0, bytesSent);
        }
    }
}

And my .moles file:

<Moles xmlns="http://schemas.microsoft.com/moles/2010/">
  <Assembly Name="System.Net" />
</Moles>

Can someone pleas point out what is wrong with this and what to do to make it work. I know that there are other ways to mock out the Socket class for example with a wrapper class that implements my own interface but I’m only interested in doing this using Moles.

–Thanks Daniel

Answer 1

In my experience, Moling the System assembly is quirky. Try this for the second line of your .moles file:

<Assembly Name="System" ReflectionOnly="true" />