Another nice thing about T::More is the large number of other helper modules that play nicely alongside it. I don't know if they work with T::Unit, maybe they do, but the whole suite is great. T::Exception, T::DatabaseRow, etc etc.

Another link worth posting again is petdance's testing large projects with perl.

And while I am on my soapbox, let me also praise Test::MockObject.

test driven development -- rah! rah! rah!

water,water everywhere