I want to thank everyone for their replies. I think I've finally gotten it.
in reply to Testing - General Questions
My last experience with QA was in an old fashioned mainframe coder sweatshop. Tests were always performed on the finished apps. The idea of creating tests for the support modules (and we sure had a lot of them) wasn't ever thought of.
The focus of Perl testing (for developers, at least) is on the functionality of the modules as assessed through their respective interfaces. The finished production apps are taken care of, in due course, if the code is truly modular.
The indentation on my forehead is now a quarter-inch deeper from slapping it when I saw how obvious the answer is. Now I can continue reading the book "Perl Testing: adn" without the disconnect I was suffering.