// Part 1 - The Controller Site
// Installed pacakages are DotnetOpenAuth.Aspnet, Microsoft.AspNet.WebPages.OAuth

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
using DotNetOpenAuth.AspNet.Clients;
using Microsoft.Web.WebPages.OAuth;

namespace MvcApplication2.Controllers
{
    public class HomeController : Controller
    {
        private static Dictionary<string, AuthenticationClientData> _authenticationClients = new Dictionary<string, AuthenticationClientData>(StringComparer.OrdinalIgnoreCase);

        public ActionResult Index()
        {
            var client = new GoogleOpenIdClient();
            var clientData = new AuthenticationClientData(client,
                                                          "Google", new Dictionary<string, object>());

            if (_authenticationClients.Any(q => q.Key == client.ProviderName) == false)
                _authenticationClients.Add(client.ProviderName, clientData);

            return Content("Success");
        }

    }
}

// Part 2 - The Test Site

using System.Web.Mvc;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using MvcApplication2.Controllers;

namespace MvcApplication2.Tests
{

    [TestClass]
    public class ControllerTest
    {
        [TestMethod()]
        public void should_return_not_empty_content()
        {
            var controller = new HomeController();
            var result = controller.Index() as ContentResult;

            Assert.IsNotNull(result.Content);
        }

    }
}