Perl has quite an active testing community - see http://qa.perl.org/ for an overview and pointers to introductory tutorial information.
An overview of some of the testing modules available on CPAN is at http://qa.perl.org/test-modules.html
A quick reference card for Perl testing modules is at http://langworth.com/PerlTestCard
There are a whole family of Perl Testing tools including:
- Test::Simple
- Test::More
- Test::Inline
- Test::Harness
- CGI::Test
- Test::Cmd
- Devel::Cover
- HTTP::WebTest which provides PerlWebTest
- Test::FIT
- LectroTest is an automatic, specification-based testing system for Perl
- ... (fill in more here!)
Discussion of these occurs on the PerlQaMailingList