code: def tearDown(self) -> None:
      os.environ.clear()
      os.environ.update(self._prev_environ)
      st.secrets._reset()
  
imports: import os
  import unittest
  from unittest.mock import PropertyMock, mock_open, patch
  import pytest
  import streamlit
  from streamlit.connections import BaseConnection
  from streamlit.runtime.secrets import AttrDict
label_desc: Use image node_id 2 for calling the BaseConnectionDefaultMethodTests obj's underlying member method code with example usage: obj.tearDown() without return types