so in order to use phpunit from phing i have to do an exec phing target since there is no other way to specify that I want to run vendor/bin/phpunit. then I can't use codeCoverage=true in the phpunit phing task (which writes some db file) since we aren't using it, which means the codecoverage setup task wont find the db file which means the code coverage threshold phing task is useless. so how is using phing supposed to simplify things?