Including Test::More and Test::Simple in your CPAN distribution You can't guarantee that your users will have Test::Simple and Test::More (or that they will have the lateset version) Put the files in your distribution: t/lib/Test/More.pm t/lib/Test/Simple.pm t/lib/Test/Builder.pm In your test script: use lib 't/lib'; use Test::Simple; use Test::More; The version of Test::Simple and Test::More that you supply will not get installed on the users computer, but will be used by your test suite.