tox.ini (testenv): Make sure to import setuptools before distutils when invoking pytest

1 files changed, 5 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 8940a182..21fdd866 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,11 @@ deps =
 	# TODO: remove after Sphinx>4.1.2 is available.
 	sphinx@git+https://github.com/sphinx-doc/sphinx; python_version>="3.10"
 commands =
-	pytest {posargs}
+	# We invoke pytest like this to avoid the warning:
+	#   UserWarning: Distutils was imported before Setuptools,
+	#   but importing Setuptools also replaces the `distutils`
+	#   module in `sys.modules`.
+	pytest -c 'import setuptools; import pytest; pytest.main("{posargs}".split())'
 usedevelop = True
 extras = testing
 passenv =