/usr/lib/python2.6/dist-packages/testtools/tests/test_testcase.py is in python-testtools 0.9.14-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/testtools/tests/../../../../../share/pyshared/testtools/tests/test_testcase.py