kconfig: tests: Reset all KCONFIG_* env variables by default

Reset all environment variables with names starting with 'KCONFIG_' from
the user-provided environment.

This fixes the 'warn_changed_input' test on systems with
KCONFIG_WARN_CHANGED_INPUT=1 and ensures a cleaner test environment.

Fixes: 645323a7f4e5 ("kconfig: add optional warnings for changed input values")
Signed-off-by: Nicolas Schier <n.schier@fritz.com>
Link: https://patch.msgid.link/20260929-kconfig-tests-minor-updates-v2-1-c5902bee1d0c@fritz.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/scripts/kconfig/tests/conftest.py b/scripts/kconfig/tests/conftest.py
index 2263bd2a3b3a..6fb391ac8fa9 100644
--- a/scripts/kconfig/tests/conftest.py
+++ b/scripts/kconfig/tests/conftest.py
@@ -57,9 +57,12 @@ class Conf:
         # Override 'srctree' environment to make the test as the top directory
         extra_env['srctree'] = self._test_dir
 
-        # Clear KCONFIG_DEFCONFIG_LIST to keep unit tests from being affected
-        # by the user's environment.
-        extra_env['KCONFIG_DEFCONFIG_LIST'] = ''
+        # Clear all KCONFIG_* environment variables
+        env = {
+            varname: os.environ[varname]
+            for varname in os.environ.keys()
+            if not varname.startswith("KCONFIG_")
+        }
 
         # Run Kconfig in a temporary directory.
         # This directory is automatically removed when done.
@@ -75,7 +78,7 @@ class Conf:
                                   stdout=subprocess.PIPE,
                                   stderr=subprocess.PIPE,
                                   cwd=temp_dir,
-                                  env=dict(os.environ, **extra_env))
+                                  env=dict(env, **extra_env))
 
             # If input key sequence is given, feed it to stdin.
             if in_keys: