Since commit7ff3ceeGitPython's tests started to depend onsumtypes which does not have any stable release available at PyPI and seems to be dead for more than two years now (seehttps://github.com/radix/sumtypes/commits/master/).

This causes inconvenience for downstream packagers where tests are run to make sure the constructed package is working properly. Could you please make thesumtypes test dependency optional (especially on non-Windows OSes)? Or switch off of it completely?

Thank you.