Rhino mock calling the function that is mocked

Trying to mock a function with RhinoMock.

var repository = new Rhino.Mocks.MockRepository();
var classMock = repository.DynamicMock<Customer>();
Expect.Call(classMock.getCustomerAge("john")).Return(12);

The problem is that in the Expect.Call line it actually calls the function that it's supposed to mock. Am I doing something wrong? Isn't the purpose of mocking that you don't have to run the actual function?

public class AgeProvider
{
    private static Service _Service;
    private static string _User;

    public AgeProvider()
    {
    }

    public AgeProvider(ISession session, string authenticatedUser)
    {
        _Service = new Service(session);
        _user = authenticatedUser;
    }

    public int getCustomerAge(string userToSearch)
    {
        var user = _Service.FindUser(_user, userToSearch);

        return user.age;
    }

}

Simplified the clas开发者_运维百科s, where the function is that I'm trying to mock.

is the method virtual? I think you also need to use a partial mock if you are mocking a class rather than an interface.

It's probably because you're using the older record/replay semantics. Instead, use the new AAA (Arrange/Act/Assert) style:

classMock.Stub(r => r.getCustomerAge("john")).Return(12);