Fix list reference issue in logging handler restoration

Co-authored-by: bittner <[email protected]>

Author: Copilot

cli_test_helpers/decorators.py

@@ -39,7 +39,8 @@ def __enter__(self):
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         sys.argv = self._old
-        logging.root.handlers = self._old_handlers
+        # Restore logging handlers by copying contents to preserve the list reference
+        logging.root.handlers[:] = self._old_handlers
 
 
 class EnvironContext(patch.dict):

docs/tutorial.rst

@@ -92,6 +92,13 @@ this approach with mocking a target function, e.g.
 
         assert mock_command.called
 
+``ArgvContext`` also provides automatic logging isolation. When test
+frameworks like pytest set up logging handlers, they can interfere with
+code under test that calls ``logging.basicConfig()``. ``ArgvContext``
+automatically saves and clears logging handlers when entering the context,
+then restores them when exiting, allowing your CLI code to configure
+logging as expected.
+
 See more |example code (argparse-cli)|_.
 
 ``EnvironContext``