Question

I have written the following method using the Repository mentioned
in the following blog-post (http://www.codecapers.com/post/Using-RavenDB-with-ASPNET-MVC.aspx) using RavenDB:

public User GetUserById(string id)
{
     var user = (from usr in _repository.All<User>() where usr.Id == id select usr).FirstOrDefault();

     if (user == null)
     {
          throw new NullReferenceException("No user with the id (" + id + ") could be found.");
     }

     return user;
}

How would you unit test this method with nunit (and perhaps moq)?

“user” is just a normal class.

Answer 1

The first question is going to be – what are you testing in this context? The method provided really only has two outcomes, so you’re basically testing whether user is null or not. Is that a value added test?

As for the how, Im assuming _repository is injected via some mechanism? If so, then you simply provide a Mock<IRepository> (insert your type name as appropriate) and inject that in the place of _repository wherever that is injected. Then you can setup the return values and test your method for the exception or not.

mockRepository.Setup(x => x.All<User>()).Returns(new List<User> { ... });