gistfile1.cs

namespace MoqTest
{
    using System;
    using Moq;

    public interface IMockMe
    {
        string HelloWorld<T> ();
    }

    class MainClass
    {
        public static void Main (string[] args)
        {
            var mock = new Mock<IMockMe> ();
            mock.Setup (x => x.HelloWorld<string> ()).Returns ("Hello World");
            Console.WriteLine (mock.Object.HelloWorld<string> ());
        }
    }
}