code: def _connect(self, **kwargs) -> str:
      return MockRawConnection()
  
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 MockConnection obj's underlying member method code with example usage: obj._connect() and returns: MockRawConnection