Covering YumRole.provision and YumRole.ensure_gpg_key
Covering YumRole.has_source
Covering YumRole.ensure_yum_source
Covering YumRole.update_date_file
Covering YumRole.store_update_date
Covering YumRole.get_last_update_date
Covering YumRole.ensure_up_to_date
Covering YumRole.force_update
Covering AptitudeRole.is_package_installed correctly
Covering YumRole.is_package_installed
Adding YumRole.package_exists; Improving YumRole package installation based on AptitudeRole