code: def test_getattr_reserved_key(self):
      with pytest.raises(StreamlitAPIException):
          getattr(self.session_state_proxy, self.reserved_key)
  
imports: import unittest
  from typing import Any, Dict
  from unittest.mock import MagicMock, patch
  import pytest
  from streamlit.errors import StreamlitAPIException
  from streamlit.runtime.state import SafeSessionState, SessionState, SessionStateProxy
  from streamlit.runtime.state.common import GENERATED_WIDGET_ID_PREFIX, require_valid_user_key
label_desc: Use image node_id 9 for calling the SessionStateProxyTests obj's underlying member method code with example usage: obj.test_getattr_reserved_key() without return types