1 files changed, 30 insertions, 7 deletions
diff --git a/scripts/kconfig/tests/conftest.py b/scripts/kconfig/tests/conftest.py
index 0345ef6e3273..d94b79e012c0 100644
--- a/scripts/kconfig/tests/conftest.py
+++ b/scripts/kconfig/tests/conftest.py
@@ -53,6 +53,10 @@ 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'] = ''
+
         # Run Kconfig in a temporary directory.
         # This directory is automatically removed when done.
         with tempfile.TemporaryDirectory() as temp_dir:
@@ -77,7 +81,22 @@ class Conf:
                 # For interactive modes such as oldaskconfig, oldconfig,
                 # send 'Enter' key until the program finishes.
                 if interactive:
-                    ps.stdin.write(b'\n')
+                    try:
+                        ps.stdin.write(b'\n')
+                        ps.stdin.flush()
+                    except (BrokenPipeError, OSError):
+                        # Process has exited, stop sending input
+                        break
+
+            # Close stdin gracefully
+            try:
+                ps.stdin.close()
+            except (BrokenPipeError, OSError):
+                # Ignore broken pipe on close
+                pass
+
+            # Wait for process to complete
+            ps.wait()
 
             self.retcode = ps.returncode
             self.stdout = ps.stdout.read().decode()
@@ -150,12 +169,10 @@ class Conf:
         defconfig_path = os.path.join(self._test_dir, defconfig)
         return self._run_conf('--defconfig={}'.format(defconfig_path))
 
-    def _allconfig(self, mode, all_config):
+    def _allconfig(self, mode, all_config, extra_env={}):
         if all_config:
             all_config_path = os.path.join(self._test_dir, all_config)
-            extra_env = {'KCONFIG_ALLCONFIG': all_config_path}
-        else:
-            extra_env = {}
+            extra_env['KCONFIG_ALLCONFIG'] = all_config_path
 
         return self._run_conf('--{}config'.format(mode), extra_env=extra_env)
 
@@ -191,13 +208,19 @@ class Conf:
         """
         return self._allconfig('alldef', all_config)
 
-    def randconfig(self, all_config=None):
+    def randconfig(self, all_config=None, seed=None):
         """Run randconfig.
 
         all_config: fragment config file for KCONFIG_ALLCONFIG (optional)
+        seed: the seed for randconfig (optional)
         returncode: exit status of the Kconfig executable
         """
-        return self._allconfig('rand', all_config)
+        if seed is not None:
+            extra_env = {'KCONFIG_SEED': hex(seed)}
+        else:
+            extra_env = {}
+
+        return self._allconfig('rand', all_config, extra_env=extra_env)
 
     def savedefconfig(self, dot_config):
         """Run savedefconfig.