I guess you'll need to load Devel::Cover for the tests you run and not for the test harness you're using. Test::Harness says that $ENV{HARNESS_PERL_SWITCHES} is the way to go. So either set the $switches variable that Test::Harness alludes to exporting, or set HARNESS_PERL_SWITCHES=-MDevel::Cover before you run the harness.

In reply to Re: Running devel::cover recursively on directory with .t files by Corion
in thread Running devel::cover recursively on directory with .t files by david2008

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