There's lots and lots of information on Test Driven Development (TDD) on the web. Much of it is very useful, but many people still don't get the primary point.
Test Driven Development is a design technique, not a testing technique.
Sure, you end up with a UnitTest suite that can be very useful for testing and provide a framework for adding tests. This is a wonderful benefit of TDD, but it's not what TTD is.
"That's what a ship is, you know. It's not just a keel and hull and a deck and sails. That's what a ship needs. But what a ship is... is freedom." (Captain Jack Sparrow, from Walt Disney's Pirates of the Caribbean: The Curse of the Black Pearl)
Test Driven Development is also freedom. It's the freedom to change your mind. It's the freedom to move forward without worrying that you're making a mistake. It's the freedom to concentrate on what you want rather than how to build it.
- The change of viewpoint required to do TDD.
- How the tests generated by TDD are "free," coming out of design time that is necessary in any case.
- Why I don't want to write software without TDD, ever again.
- How to get started with TDD.
- Greenfield development
- Legacy development
- Potential code bases
[http://columba.sourceforge.net/ Columba] email client, has some unit tests but doesn't look like complete coverage, a little big and complex for an example (broken into multiple projects built with Maven).
[http://sourceforge.net/projects/jabref/ JabRef] bibliographic database, has some unit tests, needs some refactoring for clarity, in any event.
[http://xplanner.org XPlanner] might be a possibility.
[http://jgnash.sourceforge.net/ JGnash] is a java personal finance program, has some unit tests (JUnit 4, Java 5)
[http://sourceforge.net/projects/jmoney/ JMoney] is a java/Eclipse RCP personal finance program
[http://sourceforge.net/projects/nomadpim/ Nomad PIM], Java 5, has test suite
Elsewhere:
Emmanuel Gaillot's [http://emmanuelgaillot.blogspot.com/2006/03/explaining-tdd-to-your-baker.html Explanation of TDD] to his baker.
Michael Feather's [http://www.artima.com/weblogs/viewpost.jsp?thread=126923 A Set of Unit Testing Rules] "A test is not a unit test if..."
M Easter's [http://codetojoy.blogspot.com/2007/02/im-believer.html Dining at the TDD Buffet] blog entry.
Ed Gibb's [http://edgibbs.com/2007/05/05/test-driven-development-applied/ review] of Lasse Koskela's book, Test Driven: TDD and Acceptance TDD for Java Developers (1932394850)