Update tests/server/agent_execution/test_context.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: HelloJowet

tests/server/agent_execution/test_context.py

@@ -174,7 +174,7 @@ def test_check_or_generate_context_id_no_params(self) -> None:
 
     def test_check_or_generate_context_id_with_existing_context_id(
         self, mock_params: Mock
-    ):
+    ) -> None:
         """Test _check_or_generate_context_id with existing context ID."""
         existing_id = 'existing-context-id'
         mock_params.message.context_id = existing_id