[3.15] gh-150046: Fix `test_add_python_opts` to ignore `PYTHON*` env vars (GH-150089...

gh-150046: Fix `test_add_python_opts` to ignore `PYTHON*` env vars (GH-150089)

Avoid the runtime environment from affecting the tests' behaviours,
which notably checks the warning filters which can be controlled by
various PYTHON environment variables.
(cherry picked from commit ef2246f788832a64ba7c5215c8e72f8e539e59b4)

Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>

diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index 02f6e0c74b5ce84be731a0c958f7d08d1dbb7276..874c6bb76b1afe5846f2ff6ee43d6d4942962872 100644 (file)
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -2283,7 +2283,8 @@ class ArgsTestCase(BaseTestCase):
         proc = subprocess.run(cmd,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.STDOUT,
-                              text=True)
+                              text=True,
+                              env=support.make_clean_env())
         self.assertEqual(proc.returncode, 0, proc)
 
     def test_add_python_opts(self):