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test_distutils logs 3 DeprecationWarning warnings. They are emitted on purpose and related to PEP 632.
Does someone want to propose a fix for that?
"with self.assertWarns(DeprecationWarning):" or warnings_helper.check_warnings() of test.support.warnings_helper can be used.
$ ./python -m test -v test_distutils 
(...)
0:00:00 load avg: 5.49 [1/1] test_distutils
/home/vstinner/python/master/Lib/test/test_distutils.py:8: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
 import distutils.tests
(...)
test_byte_compile_optimized (distutils.tests.test_build_py.BuildPyTestCase) ... /tmp/tmpptdx9r50.py:1: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
 from distutils.util import byte_compile
ok
(...)
test_byte_compile (distutils.tests.test_install_lib.InstallLibTestCase) ... /tmp/tmpk_cfc09q.py:1: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
 from distutils.util import byte_compile
ok
(...)
Tests result: SUCCESS
--
By the way, it would be nice to ignore the DeprecationWarning in setup.py as well for now:
$ make
(...)
/home/vstinner/python/master/./setup.py:33: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
 from distutils import log
(...)
This warning is annoying.

Another warning:
$ ./python -m test -v test_check_c_globals
(...)
DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
 import distutils.ccompiler
(...)
Tests result: SUCCESS

I have reported this in the original issue earlier https://bugs.python.org/issue41282#msg388224 . See also https://bugs.python.org/issue43425 for more discussion over handling this.

Ok, let's reuse bpo-41282.
I created PR 25405 and PR 25406.