Moq, TDD and multiple layers

I have a data assembly which defines my repositories.

I then have a service assembly which defines my services, each service has a repository injected into the constructor by Ninject.

When I'm unit testing my service methods, everything is fine:

[TestClass]
 public class UserTests
 {
     IQueryable<User> users;
     int userID;
 
     public UserTests()
     {
         users = new List<User>()
         {
             new User { EmailAddress = "known@user.com", Password = "password", ID = 1}
         }.AsQueryable();
     }
 
     [TestMethod]
     public void Known_User_Can_Login()
     {
         // Arrange
         var repository = new Mock<IUserRepository>();
         var service = new UserService(repository.Object);
 
         repository.Setup(r => r.GetAll())
            .Returns(users);
 
         // Act
         bool loggedIn = service.UserLogin("known@user.com", "password", out userID);
 
         // Assert
         Assert.IsTrue(loggedIn);
         Assert.AreEqual(1, userID);
     }
 
     [TestMethod]
     public void Unknown_User_Cannot_Login()
     {
         // Arrange
         var repository = new Mock<IUserRepository>();
         var service = new UserService(repository.Object);
 
         repository.Setup(r => r.GetAll())
             .Returns(users);
 
         // Act
         bool loggedIn = service.UserLogin("unknown@user.com", "password", out userID);
 
         //
         Assert.IsFalse(loggedIn);
     }
 }
 

However, I'm running into problems when testing my controller (another level down).

My controller has dependencies on a service, and the service depends on a repository. I can't seem to get my controller tests to work. Here's what I have so far:

 [TestClass]
 public class AccountTests
 {
     IQueryable<User> users;
 
     public AccountTests()
     {
         users = new List<User>()
         {
             new User { CompanyId = 1, EmailAddress =  "known@user.com", Password = "password"},
             new User { CompanyId = 1, EmailAddress = "unknown@user.com", Password = "password"}
         }.AsQueryable();
     }
 
     [TestMethod]
     public void Known_User_Can_Login()
     {
         int userID = 0;
 
         var repo = new Mock<IUserRepository>();
 
         // Arrange
         var service = new Mock<UserService>(repo);
         var controller = new AccountController(service.Object);
 
         // Act
         var result = controller.Login(new LoginModel { EmailAddress = "known@user.com", Password = "password" }) as RedirectToRouteResult;
 
         // Assert
         service.Verify(x => x.UserLogin("known@user.com", "password", out userID), Times.Once());
         Assert.AreEqual("Index", result.RouteValues["Action"]);
     }
 }
 

I keep getting an error about instantiating the UserService (i'm attempting to pass an instance of the UserRepository to it but it isn't working).

I must be doing something daft, but what?

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