JUnitのこちらをご覧ください
JUnit is a unit testing framework for the Java programming language. JUnit has been important in the development of test-driven development, and is one of a family of unit testing frameworks collectively known as xUnit that originated with JUnit.
This app will teach you how to use JUnit in your day-2-day life of any project unit testing while working with Java programming language.
This app has been prepared for the beginners to help them understand basic functionality of JUnit tool. After completing it you will find yourself at a moderate level of expertise in using JUnit testing framework from where you can take yourself to next levels.