Unit/Integration Testing MVC with RavenDb (using MS Test)

Authentication.cs

using System.Security.Principal;

namespace MyApp.Models.Authentication
{
    public class CustomIdentity : GenericIdentity, ICustomIdentity
    {
        public CustomIdentity(string userId, string displayName)
            : base(string.IsNullOrEmpty(displayName) ? string.Empty : displayName, "Forms")
        {
            UserId = userId;
        }

        #region Implementation of CustomIdentity

        public string UserId { get; private set; }

        #endregion
    }

  public class CustomPrincipal : GenericPrincipal
  {
        public CustomPrincipal(ICustomIdentity identity, string[] roles)
            : base(identity, roles)
        {
            Identity = identity;
        }

        public new virtual ICustomIdentity Identity { get; private set; }
  }
}

ControllerUtils.cs

using System.Web.Mvc;
using CuttingEdge.Conditions;
using Moq;
using myApp.Models.Authentication;

namespace MyApp.Tests.Controllers
{
    public static class ControllerUtilities
    {
        // Reference: http://nerddinnerbook.s3.amazonaws.com/Part12.htm
        public static void SetUpControllerContext(ControllerBase controller,
                                                  string userId = null,
                                                  string displayName = null,
                                                  string[] roles = null)
        {
            Condition.Requires(controller);

            // Some fake Authentication stuff.
            var customIdentity = new CustomIdentity(userId, displayName);
            var customPrincipal = new CustomPrincipal(customIdentity, roles);

            var mockControllerContext = new Mock<ControllerContext>();
            mockControllerContext.Setup(x => x.HttpContext.User).Returns(customPrincipal);

            controller.ControllerContext = mockControllerContext.Object;
        }
    }
}

group_tests.cs

[TestClass]
public class GroupControllerTests
{
  IDocumentStore _store;

  [TestInitialize]
  public void SetUp()
  {
    _store = new EmbeddableDocumentStore
    {
       RunInMemory = true
    };

    _store.Initialize();

    Session = _store.OpenSession();
  }

  [TestMethod]
  public void Adding_New_Group()
  {
    Group newGroup = new Group() { Name = "Test group" };

    var target = new GroupsController(_store);
    ControllerUtilities.SetUpControllerContext(target, "testGroup", "Test group", null);

    RedirectToRouteResult result= target.Create(newGroup);
    Assert.AreEqual("Index", result.RouteName);

    // verify Group was successfully added to the database.
    var createdGroup = session.Load<T>(newGroup.Id)
    Assert.AreEqual(newGroup.Name, createdGroup.Name);
  }
}