I'm working on a project where application software is written in Java(ob-sob), and development tools in Perl. Christian's stuff allows us to have exactly the same development methodology between the two parts since it's based on JUnit which we use for unit-testing the Java stuff.

It's possible to

• define tests to run in a clean environment that is reinitialised for each test
• progressively integrate new tests and test suites
• run either in batch or GUI with meaningful output in both cases (the TK implementation mirrors the JUnit swing implementation very well)
• make testing easy enough not to skip it!

Well worth checking out