How to test your Perl code
perl.com has published a number of articles on specific testing techniques:
The CPAN has a wide variety of modules to help with your automated testing. Here's a summary of what's available.
Here's a handy summary of guidelines for writing effective tests, compiled from lessons learned when improving the tests for DBI.
Automated testing is a key part of software development, especially in environments that have embraced extreme programming. Perl's Test::Harness framework, along with Test::Simple and Test::More, allow flexible testing of all parts of your development projects.
A starter list of resources: