`The real experts in the field of software testing can speak at great length about the many different kinds of testing. There is unit testing, regression testing, integration testing, system testing, black box testing, white box testing, stress testing and that funky "Australian rules" testing where you have to hit the bug with your fist. These guys can pick any one of these types of testing and write an entire textbook on it.'
Please make sure you register your copy of http://books.perl.org/book/236 soon. We'll be providing blow-in errata pages that cover Test::Australian.
