Internal Program Version: Test::Warnings  0.38.0.5.42.0

If you've ever tried to use Test::NoWarnings to confirm there are no
warnings generated by your tests, combined with the convenience of
'done_testing' to not have to declare a test count, you'll have discovered
that these two features do not play well together, as the test count will
be calculated _before_ the warnings test is run, resulting in a TAP error.

http://search.cpan.org/dist/Test-Warnings/