Using Moq with Windsor -- Object of Type Moq.Mock[IFoo] cannot be converted to IFoo

Question

I'm trying to set up some Moq repositories to test my service with Castle Windsor as my IOC. Mu service depends on IFoo, so I'm creating a moq instance that implements IFoo and injecting it into the container like so:

_container.AddComponent("AutoBill", 
  typeof (AutoBillService), typeof (AutoBillService));

var mockUserRepository = new Mock<IUserRepository>();
var testUser = new User()
   {
     FirstName = "TestFirst",
     LastName = "TestLast", 
     UID=1
   };
mockUserRepository.Setup(repo => repo.GetUser(testUser.UID))
   .Returns(testUser);

_container.Kernel.AddComponentInstance("UserRepository", 
   typeof(IUserRepository), mockUserRepository);

var service = _container.Resolve<AutoBillService>(); //FAIL

Doing this gives me an exception: System.ArgumentException: Object of type 'Moq.Mock`1[IUserRepository]' cannot be converted to type 'IUserRepository'

Can anyone see what I'm doing wrong?

Answer 1

You should pass mockUserRepository.Object instead of mockUserRepository.

This would be a lot more evident if you used the strongly typed API:

_container.Register(Component
    .For<IUserRepository>()
    .Instance(mockUserRepository.Object));

This compiles because the Object property implements IUserRepository.