jMock 2 is a library for testing Java code using mock objects. Mock objects help you design and test the interactions between the objects in your programs.

jMock 2:

• makes it quick and easy to define mock objects, so you don't break the rhythm of programming.
• lets you define flexible constraints over object interactions, reducing the brittleness of your tests.
• acts as a "domain-specific embedded language" for specifying expectations so it is easy to read and understand the intent of tests with mock objects.
• uses real method calls to specify expectations, so code can be easily refactored in modern IDEs.
• is easy to extend.

More information can be found on the jMock website (www.jmock.org).