Test::Simple we can put any expression inside the ok(), and any descriptive text to describe the case: ok( 1 + 1, "addition works"); ok( $rocket->fuel > $min, "there's enough fuel" ); ok( $baby->is_chubby, "the baby is well fed " ); ok( !$rocket->safety_brake->on, "nothin' holding us back " ); ok( 2 + 2 == 5, "I love Big Brother!" );