Mock objects help you design and test the interactions between the objects in
your programs.
The jMock library:
* makes it quick and easy to define mock objects, so you don't break the
rhythm of programming.
* lets you precisely specify the interactions between your objects, reducing
the brittleness of your tests.
* works well with the auto-completion and re-factoring features of your IDE
* plugs into your favorite test framework
* is easy to extend.
