Unit Testing the Console Applications with ReadLine and WriteLine methods

public class Program

{

    public static void Main(string[] args)

    {

        Console.WriteLine("Enter your name.");

        string name = Console.ReadLine();

        Console.WriteLine("Hello, {0}.", name);

        Console.WriteLine("Type a message.");

        string message = Console.ReadLine();

        Console.WriteLine("You wrote: {0}", message);

    }

}

[TestMethod]

public void RunMain()

{

    using (StringWriter sw = new StringWriter())

    {

        Console.SetOut(sw);

        using (StringReader sr = new StringReader(string.Format("Mark{0}Ploeh{0}",

            Environment.NewLine)))

        {

            Console.SetIn(sr);

            Program.Main(new string[] { });

            string expected = string.Format(

                "Enter your name.{0}Hello, Mark.{0}Type a message.{0}You wrote: Ploeh{0}",

                Environment.NewLine);

            Assert.AreEqual<string>(expected, sw.ToString());

        }

    }

}

For more details :
http://blogs.msdn.com/b/ploeh/archive/2006/10/21/consoleunittesting.aspx