A small mock library that is extremely easy to learn with plenty of examples. Only has 5 classes for the api. This library's best feature is being able to test a 24 hour timer in milliseconds with a mockobject timer.
Java mocking is dominated by expect-run-verify libraries like EasyMock or jMock. Mockito offers simpler and more intuitive approach: you ask questions about interactions after execution. Using mockito, you can verify what you want. Using expect-run-verify libraries you are often forced to look after irrelevant interactions.
To someone who is new to unit testing, the idea of mock objects can be confusing to say the least. I have covered in previous tutorials how to use various mock object frameworks (EasyMock and jmockit). However in this tutorial, we will focus on the concept of mocking in general. What is a mock object? What is it used for? Why can't I mock object XYZ? Let's look into these questions and maybe clear a bit of the air on the use of mock objects.