Unsuprisingly, based on some recent posts by chromatic, there's now an article by him at perl.com, "An Introduction to Testing", which covers the use of Test::Harness, Test::More and other testing modules. Definitely a good read.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important