Debugging import error on local Ubuntu

[ruokolt]

Description

A branch from main, trying to debug this error I get locally on Ubuntu:

=============================================================================================================================== ERRORS ===============================================================================================================================
___________________________________________________________________________________________________________________ ERROR collecting test session ____________________________________________________________________________________________________________________
dev-env/lib/python3.10/site-packages/_pytest/config/__init__.py:641: in _importconftest
    mod = import_path(conftestpath, mode=importmode, root=rootpath)
dev-env/lib/python3.10/site-packages/_pytest/pathlib.py:567: in import_path
    importlib.import_module(module_name)
dev-env/lib/python3.10/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1050: in _gcd_import
    ???
<frozen importlib._bootstrap>:1027: in _find_and_load
    ???
<frozen importlib._bootstrap>:992: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:241: in _call_with_frames_removed
    ???
<frozen importlib._bootstrap>:1050: in _gcd_import
    ???
<frozen importlib._bootstrap>:1027: in _find_and_load
    ???
<frozen importlib._bootstrap>:1006: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:688: in _load_unlocked
    ???
<frozen importlib._bootstrap_external>:883: in exec_module
    ???
<frozen importlib._bootstrap>:241: in _call_with_frames_removed
    ???
dev-env/lib/python3.1/site-packages/matplotlib/tests/__init__.py:6: in <module>
    raise OSError(
E   OSError: The baseline image directory does not exist. This is most likely because the test data is not installed. You may need to install matplotlib from source to get the test data.

How to reproduce

Locally on Ubuntu:

micromamba create -f dev-environment.yml -p $PWD/dev-env/
micromamba activate dev-env/
pytest .