@jeremiedbb, thanks for all the hints, I solved the issues.

I am going to try updating the minimal version of pytest. We are 2 major versions of difference which is quite a lot.

OK, this is interesting. It seems that the INTERNALERROR is not anymore.

I found out that the files

• build_tools/azure/debian_atlas_32bit_lock.txt
• build_tools/azure/debian_atlas_32bit_requirements.txt

were not updated to the new pytest version.
So I tried this out by updating them manually.

Now, the INTERNALERROR seems to be back... 🤷
Possibly one has to call the update_environments_and_lock_files.py script in the build_tools folder.
Unfortunately, this doesn't work in my codespace.
I could not figure out why (up to now).
Maybe it is a good idea that someone else should call this script instead to be sure to update the above files in a better way...

It is what I intended to do here: #26184

@glemaitre Finally it works. It seems that pytest did not like the . operator for referring to modules in the same folder. Thus, I replaced

from ._param_validation import Interval, Integral, validate_params

by

from ..utils._param_validation import Interval, Integral, validate_params.

✔️ Linting Passed

All linting checks passed. Your pull request is in excellent shape! ☀️

_{Generated for commit: fac27b5. Link to the linter CI: here}