/usr/lib/python2.7/dist-packages/twisted/mail/test/ is in python-twisted-mail 13.2.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/twisted/mail/test/__init__.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/pop3testserver.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/rfc822.message
/usr/lib/python2.7/dist-packages/twisted/mail/test/server.pem
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_bounce.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_imap.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_mail.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_mailmail.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_options.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_pop3.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_pop3client.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_scripts.py
/usr/lib/python2.7/dist-packages/twisted/mail/test/test_smtp.py