Reference

Test::Harness::Util(3pm)

Test::Harness::Util - Utility functions for Test::Harness::* Utility functions for Test::Harness::* The following are all available to be imported to your module. No symbols are exported by default.
all_in( {parm => value, parm => value} ) Finds all the *.t in a directory. Knows to skip .svn and CVS directories. Valid parms are: Starting point for the search. Defaults to ".". Flag to say whether it should recurse. Default to true. Returns a shuffled copy of @list.
blibdir() Finds all the blib directories. Stolen directly from blib.pm