...
[JUnit|http://en.wikipedia.org/wiki/JUnit] is is a testing framework for Java applications. It was one of the first testing frameworks for Java and it's a widespread use in the community. The framework simplifies the development of unit tests and the current IDE's make even easier building those tests from existing classes and running them.
Junit 4.8.1 is added as a dependency in the parent project. The dependency needs to be propagated to the subprojects that contain tests to be run.
As of JUnit 4.4, [HarmcrestHamcrest|http://code.google.com/p/hamcrest/] is included. Harmcrest Hamcrest is a library of matcher objects that facilitate the validation of conditions in the tests.
...