https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1099038
My question is why pytest try to create a file in the modules system library ?
My guess is that it's because the tests are executed from the module
installation directory.
If you look at the debci output[1], you'll see lots of paths like this:
../../../../usr/lib/python3/dist-packages/silx/app/compare/test
pytest is simply trying to create a cache dir inside the module path.
I'm not sure why it would fail because of that, since those exceptions are
caught and should only result in a warning. But I may be overlooking something.
You could try to change the cache with this option: [2]
Or perhaps you should look at how pytest is executed, and if it's using the
correct test location.
Should these unit tests really be installed alongside the module?
[1] https://ci.debian.net/packages/s/silx/testing/amd64/58042493/
[2] https://docs.pytest.org/en/latest/reference/reference.html#confval-cache_dir
