code: def setUp(self) -> None:
      # st.secrets modifies os.environ, so we save it here and
      # restore in tearDown.
      self._prev_environ = dict(os.environ)
  
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 1 for calling the BaseConnectionDefaultMethodTests obj's underlying member method code with example usage: obj.setUp() without return types