/usr/lib/python2.7/dist-packages/sage/tests/ is in sagemath-common 8.1-7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/sage/tests/__init__.py
/usr/lib/python2.7/dist-packages/sage/tests/all.py
/usr/lib/python2.7/dist-packages/sage/tests/article_heuberger_krenn_kropf_fsm-in-sage.py
/usr/lib/python2.7/dist-packages/sage/tests/arxiv_0812_2725.py
/usr/lib/python2.7/dist-packages/sage/tests/benchmark.py
/usr/lib/python2.7/dist-packages/sage/tests/book_schilling_zabrocki_kschur_primer.py
/usr/lib/python2.7/dist-packages/sage/tests/book_stein_ent.py
/usr/lib/python2.7/dist-packages/sage/tests/book_stein_modform.py
/usr/lib/python2.7/dist-packages/sage/tests/cmdline.py
/usr/lib/python2.7/dist-packages/sage/tests/deprecation_test.py
/usr/lib/python2.7/dist-packages/sage/tests/finite_poset.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/
/usr/lib/python2.7/dist-packages/sage/tests/french_book/__init__.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/calculus_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/domaines_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/float_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/integration_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/linalg_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/linsolve_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/mpoly.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/nonlinear_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/numbertheory.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/polynomes.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/programmation_doctest.py
/usr/lib/python2.7/dist-packages/sage/tests/french_book/recequadiff.py
/usr/lib/python2.7/dist-packages/sage/tests/functools_partial_src.py
/usr/lib/python2.7/dist-packages/sage/tests/gap_packages.py
/usr/lib/python2.7/dist-packages/sage/tests/gosper-sum.py
/usr/lib/python2.7/dist-packages/sage/tests/parigp.py
/usr/lib/python2.7/dist-packages/sage/tests/py3_syntax.py
/usr/lib/python2.7/dist-packages/sage/tests/startup.py
/usr/lib/python2.7/dist-packages/sage/tests/symbolic-series.py