Description:

AHHHHHHH!!!! NOT TESTING! Anything but testing! Beat me, whip me,
send me to Detroit, but don't make me write tests!
-- perldoc Test::Tutorial

Test::Simple is an extremely simple, extremely basic module for
writing tests suitable for CPAN modules and other pursuits. If you
wish to do more complicated testing, use the Test::More module (a
drop-in replacement for this one).

The purpose of Test::More is to provide a wide range of testing
utilities. Various ways to say "ok" with better diagnostics,
facilities to skip tests, test future features and compare complicated
data structures. While you can do almost anything with a simple "ok()"
function, it doesn't provide good diagnostic output.