/usr/lib/python3/dist-packages/twisted/internet/test/ is in python3-twisted-experimental 13.2.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/twisted/internet/test/__init__.py
/usr/lib/python3/dist-packages/twisted/internet/test/_posixifaces.py
/usr/lib/python3/dist-packages/twisted/internet/test/connectionmixins.py
/usr/lib/python3/dist-packages/twisted/internet/test/modulehelpers.py
/usr/lib/python3/dist-packages/twisted/internet/test/reactormixins.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_abstract.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_address.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_base.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_core.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_default.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_endpoints.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_epollreactor.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_fdset.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_filedescriptor.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_gireactor.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_glibbase.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_inlinecb.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_main.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_newtls.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_posixbase.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_protocol.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_sigchld.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_tcp.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_threads.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_tls.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_udp.py
/usr/lib/python3/dist-packages/twisted/internet/test/test_udp_internals.py