Test::Unit::Tutorial is a Perl module that contains a tutorial on unit testing.
Here should be extensive documentation on what unit testing is, why it is useful, and how to do it with the Test::Unit collection of modules.
Sorry for not implementing this yet.
Please have a look at the examples in the examples directory and read the README file that came with this distribution.
A short tutorial on how to use the unit testing framework is included in Test::Unit::TestCase.
Further examples can be found by looking at the self test collection, starting in Test::Unit::tests::AllTests.