jMock is a library for testing Java code using mock objects.

See:
Description

User API

org.jmock
org.jmock.builder

Extension API

org.jmock.core
org.jmock.core.constraint	A collection of commonly useful constraints
org.jmock.core.matcher
org.jmock.core.stub
org.jmock.util

Optional Extensions

org.jmock.cglib

Legacy API

org.jmock.expectation

jMock 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.

The jMock package:

• 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.
• is easy to extend.

New releases and more documentation can be found at the jMock website (www.jmock.org).