Mocking a class vs. mocking its interface

Question

For a unit test, I need to mock several dependencies. One of the dependencies is a class which implements an interface:

public class DataAccessImpl implement         


        

Answer 1

If you only use it through interface and it's not a partial mock, there is no difference other than your inner feeling. Mocking the class will also mock non-used public method if the class has them, but that is not a big deal to consider.