improve consistent use of TestHelper, code covering filtering, and @group tags
improve consistent use of TestHelper, code covering filtering, and @group tags

git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@19582 44c647ce-9c0f-0410-b52a-842ac1e357ba

zendframework/zend-mime,Maks3w/zend-mime,Xerkus/zend-mime