doctesting with pytest fails on system install of sage #33521
Description
pytest assumes the directory containing the code to be tested is writable. This is not currently the case on sage-on-distro were most of the time testing is done after installing on the system.
Here is a typical result
============================= test session starts ==============================
platform linux -- Python 3.10.2, pytest-7.0.1, pluggy-1.0.0
rootdir: /usr
plugins: hypothesis-6.38.0
collected 0 items
=============================== warnings summary ===============================
../../usr/lib/python3.10/site-packages/_pytest/cacheprovider.py:433
/usr/lib/python3.10/site-packages/_pytest/cacheprovider.py:433: PytestCacheWarning: could not create cache path /usr/.pytest_cache/v/cache/nodeids
config.cache.set("cache/nodeids", sorted(self.cached_nodeids))
../../usr/lib/python3.10/site-packages/_pytest/stepwise.py:52
/usr/lib/python3.10/site-packages/_pytest/stepwise.py:52: PytestCacheWarning: could not create cache path /usr/.pytest_cache/v/cache/stepwise
session.config.cache.set(STEPWISE_CACHE_DIR, [])
-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
pytest can be started with some option to change the location of the cache directory -o cache_dir=.... pytest is currently called from sage-runtest and this is where we may want to apply any changes.
CC: @tobiasdiez @orlitzky @dimpase
Component: distribution
Author: Matthias Koeppe
Branch/Commit: 84d3d9e
Reviewer: François Bissey
Issue created by migration from https://trac.sagemath.org/ticket/33521