I'm not aware of any comprehensive Perl Monks node covering this topic in
the past five years, so your new node is long overdue and very welcome.
I've written two PM nodes that may be of use:
- Writing Solid CPAN Modules (2005). Though the text is horribly out of date, I've updated the "See also" and "Related CPAN Modules" sections (at the end) regularly, so you might find some useful links there.
- Perl CPAN test metadata (2010). This one is CPAN tester related. The text is a bit speculative but you might find some useful material in the "References" and "The Oslo Consensus" sections at the end. In particular, you might like to mention the xt/ directory for author tests.