You may be interested in how I do it in Test::Harness and WWW::Mechanize: http://search.cpan.org/src/PETDANCE/WWW-Mechanize-0.72/t/mech-dump.t and http://search.cpan.org/src/PETDANCE/Test-Harness-2.40/t/prove-switches.t

This is also sort of being discussed over on perl-qa.

If someone wants to write up a summary of what's available, please do it in POD (or HTML if you must) and mail it to me so that I can put it up on http://qa.perl.org.