/usr/lib/python2.7/dist-packages/sagenb/testing/ is in python-sagenb 1.0.1+ds1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/sagenb/testing/HTMLTestRunner.py
/usr/lib/python2.7/dist-packages/sagenb/testing/__init__.py
/usr/lib/python2.7/dist-packages/sagenb/testing/notebook_test_case.py
/usr/lib/python2.7/dist-packages/sagenb/testing/run_tests.py
/usr/lib/python2.7/dist-packages/sagenb/testing/selenium/
/usr/lib/python2.7/dist-packages/sagenb/testing/selenium/__init__.py
/usr/lib/python2.7/dist-packages/sagenb/testing/selenium/selenium.py
/usr/lib/python2.7/dist-packages/sagenb/testing/stress.py
/usr/lib/python2.7/dist-packages/sagenb/testing/tests/
/usr/lib/python2.7/dist-packages/sagenb/testing/tests/__init__.py
/usr/lib/python2.7/dist-packages/sagenb/testing/tests/test_accounts.py
/usr/lib/python2.7/dist-packages/sagenb/testing/tests/test_worksheet.py
/usr/lib/python2.7/dist-packages/sagenb/testing/tests/test_worksheet_list.py