So I have been writing tests for years. I've written a number of modules that do (essentially) what Test::Most does. Yet in all this time I knew nothing of Test::Builder::Module. Argh! This module makes building test modules so easy. No more

  my $caller = caller();
  eval "package $caller; use Test::More";

Instead you can use Test::Builder::Module to do a lot of this. It appears to be an extremely useful module and it's high time I start using it.