2022.05.24 - Add __main__ section to tests to enable `python tests.py`
2022.05.16 - Add tests.py in sdist
2022.05.11 - Import from CPython (last modified 662db125cddbca1db68116c547c290eb3943d98e)
           - Remove Version base class and StrictVersion
           - Style with black
           - Add non-importing check for distutils.version.LooseVersion to maintain
             compatibility
