Getting up to speed fast will be an accomplishment. I am hard pressed to find a good, modern tutorial for unit testing with Perl, but i did run across this Youtube video and i thought the first 10 minutes are actually pretty nice. The final 20 seem to cover code coverage which might be more than you need, right now. I find code coverage to be more useful for legacy code you have inherited, but it can greatly help you ensure that all areas of your new code is being tested as well.
(the triplet paradiddle with high-hat)