code: def test_getattr_totally_nonexistent_attr(self):
      with pytest.raises(AttributeError) as e:
          MockConnection(
              "my_mock_connection"
          ).totally_nonexistent_method()
  
      assert (
          str(e.value)
          == "'MockConnection' object has no attribute 'totally_nonexistent_method'"
      )
  
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 6 for calling the BaseConnectionDefaultMethodTests obj's underlying member method code with example usage: obj.test_getattr_totally_nonexistent_attr() without return types