According to the Test::More documentation, it is recommended to run use_ok() inside a BEGIN block, so functions are exported at compile-time and prototypes are properly honored. That is, instead of writing this: use_ok( 'Some::Module' ); use_ok( 'Other::Module' ); One should write this: BEGIN { use_ok( 'Some::Module' ); } BEGIN { use_ok( 'Other::Module' ); } However, people often either forget to add BEGIN, or mistakenly group use_ok with other tests in a single BEGIN block, which can create subtle differences in execution order. With this module, simply change all use_ok in test scripts to use ok, and they will be executed at BEGIN time. The explicit space after use makes it clear that this is a single compile-time action. WWW: http://search.cpan.org/dist/Test-use-ok/