Hi

cover -delete
HARNESS_PERL_SWITCHES=-MDevel::Cover make test
[download]

The first command deletes any existing coverage database. On the second line we set an environment variable for Test::Harness, HARNESS_PERL_SWITCHES to a Perl command-line switch that imports Devel::Caller. This is all that's required of you. Each of your test programs will now run with Devel::Caller loaded and analyzing execution in the background.

perl.com for more information.