JUnit.org Resources for Test Driven Development

The tests should drive you to write the code, the reason you write code is to get a test to succeed, and you should only write the minimal code to do so. Note that test-first-design is more than just unit testing. Unit testing by itself does not change the design of the code. In addition to documenting how code should be used, test-first-design helps you keep the design simple right from the start, and keeps the design easy to change. [Article Text]