code: def setUp(self):
      self.session_mgr = WebsocketSessionManager(
          session_storage=MockSessionStorage(),
          uploaded_file_manager=MagicMock(),
          script_cache=MagicMock(),
          message_enqueued_callback=MagicMock(),
      )
  
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 1 for calling the WebsocketSessionManagerTests obj's underlying member method code with example usage: obj.setUp() without return types