I've done that recently with all of my modules on CPAN. Especially if you run them with 5.8.1 (in which all test-suites are always run with warnings, even if you don't put them in yourself!).
I would recommend every CPAN author to take the time to take a recent maint snapshot of Perl and try to install their modules with that release. You will surprised with the number of warnings you will get from what you think was perfectly good code (unless you were using warnings already, of course).
I must however note that some warnings can not be traced that easily, especially when you're doing stuff with threads ;-(. These are usually inside multiple levels of eval and probably in the Test::xxx modules itself.
And finally, it did show some of my module's tests were bogus, as they were always returning ok, which a warning pointed out to me. So I'm happy with some test-bugs having been stamped out.
Liz
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