Question

I have just started using Rhino mocks and I am having difficulty doing that.

Here is my function which I am trying to test.

public bool IsUserExists(string emailAddress)
{
    return _repository.IsUserExists(emailAddress);
}

Here is my test which I wrote and currently failing when the actual call is made

[TestClass]
public class UserServiceTest
{
    private MockRepository _mockRepository;
    private IUserRepository _userRepository; 
    private IUserService _userService;
    public UserServiceTest()
    {
         _mockRepository = new MockRepository();
        _userRepository = MockRepository.GenerateMock<IUserRepository>();
        _userAccntService = new UserAccntService();
    }

    [TestMethod]
    public void Should_return_true_IfUserWithEmailExists()
    {
        var emailaddress = "[e-mail]";

        _userRepository.Stub(x => x.IsUserExists(emailaddress)).Return(true);

        bool ifUserExists = _userAccntService.IsUserAcctExists(emailaddress); //    throws!

        Assert.AreEqual(ifUserExists,true);

    }
}

We are currently using EF for making repository calls.
And when I am trying to test this method it is failing when the function call is made in actual.
I am getting entitycommandexecution error in the call to _userAccntService.IsUserAcctExists.

Answer 1

The fact that you’re getting an entity framework error means that _repository is pointing to an actual instance of an EF object, while _userRepository is a mock. Make sure that your _userAccntService‘s repository instance is pointing to exactly _userRepository.

In other words, in your test setup method, when you construct _userRepository, make sure that’s what gets passed into your _userAccntService constructor.

---

So, looking at your updated code:

public UserServiceTest() {
     _mockRepository = new MockRepository();
    _userRepository = MockRepository.GenerateMock<IUserRepository>();
    _userAccntService = new UserAccntService();
}

_userAccntService is never passed _userRepository, so how can it be expected to use it when you call IsUserAcctExists()? This repository dependency needs to be injected into your _userAccntService instance. Something like:

public UserServiceTest() {
     _mockRepository = new MockRepository();
    _userRepository = MockRepository.GenerateMock<IUserRepository>();
    _userAccntService = new UserAccntService(_userRepository);
}