I usually use Test::More and the associated(?) prove tool - they're standard with newer perls.

Most CPAN modules have tests in either test.pl or the t/*.t files. Take a look at cpan.org: here are the tests for CGI.pm for example.

update: other links that might be of interest:

A Test::MockObject Illustrated Example

the Test::Unit documentation

Unit Testing @ extremeperl.org

update2: also take a look at

The Joy of Test

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: How to write code tests by Joost
in thread How to write code tests by tcf03

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