Make dol tests work on windows.

[thorwhalen]

I made a windows CI here: https://github.com/i2mint/dol/blob/master/.github/workflows/windows_ci.yml

I run it manually for now, to keep us aligned with windows (or know that we're not).

But some tests fail in windows. Not sure how much of it is an adaptation that is needed in the tests, or if some adaptation is needed in the actual code.

See the CI run log here:
https://github.com/i2mint/dol/actions/runs/18514406843/job/52761887894

I'd like to adapt our code so it also works with windows and tests pass.

If it's a doctest, and it would be cumbersome to adapt to windows, then I think we should just skip those (I think I am, in the windows test, I'm doing python -m pytest). But the other tests should work (or the assertions adapted).