/usr/lib/python3/dist-packages/fixtures/tests/ is in python3-fixtures 1.3.1-2.
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..
/usr/lib/python3/dist-packages/fixtures/tests/__init__.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/__init__.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_environ.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_logger.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_mockpatch.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_monkeypatch.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_packagepath.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_popen.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_pythonpackage.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_pythonpath.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_streams.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_tempdir.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_temphomedir.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_timeout.py
/usr/lib/python3/dist-packages/fixtures/tests/_fixtures/test_warnings.py
/usr/lib/python3/dist-packages/fixtures/tests/helpers.py
/usr/lib/python3/dist-packages/fixtures/tests/test_callmany.py
/usr/lib/python3/dist-packages/fixtures/tests/test_fixture.py
/usr/lib/python3/dist-packages/fixtures/tests/test_testcase.py