Are we testing competence in syntax? How about security? OO principles? Learning how to make perl Do Things (TM) isn't hard, and the hypothetical test would be as much of a joke as a learner's permit to drive. Think about testing paradigms and specialties instead.
Perl cannot be juxtapositioned to driving.
certification is good to bring perl in business, but it would loose the attraction it now has,something like in order to do what I love to do I have to do all that sh** that I hate the most.