code: def test_is_active_session(self):
      session_id = self.connect_session()
      assert self.session_mgr.is_active_session(session_id)
  
imports: import unittest
  from unittest.mock import MagicMock, patch
  import pytest
  from streamlit.runtime.script_data import ScriptData
  from streamlit.runtime.session_manager import SessionStorage
  from streamlit.runtime.websocket_session_manager import WebsocketSessionManager
label_desc: Use image node_id 14 for calling the WebsocketSessionManagerTests obj's underlying member method code with example usage: obj.test_is_active_session() without return types