code: def tearDown(self):
      self.clear_queue()
      add_script_run_ctx(
          threading.current_thread(), self.orig_report_ctx
      )
      Runtime._instance = None
  
imports: import threading
  import unittest
  from typing import List
  from unittest.mock import MagicMock
  from streamlit.proto.Delta_pb2 import Delta
  from streamlit.proto.ForwardMsg_pb2 import ForwardMsg
  from streamlit.runtime import Runtime
  from streamlit.runtime.caching.storage.dummy_cache_storage import MemoryCacheStorageManager
  from streamlit.runtime.forward_msg_queue import ForwardMsgQueue
  from streamlit.runtime.media_file_manager import MediaFileManager
  from streamlit.runtime.memory_media_file_storage import MemoryMediaFileStorage
  from streamlit.runtime.memory_uploaded_file_manager import MemoryUploadedFileManager
  from streamlit.runtime.scriptrunner import ScriptRunContext, add_script_run_ctx, get_script_run_ctx
  from streamlit.runtime.scriptrunner.script_requests import ScriptRequests
  from streamlit.runtime.state import SafeSessionState, SessionState
  from streamlit.web.server.server import MEDIA_ENDPOINT, UPLOAD_FILE_ENDPOINT
label_desc: Use image node_id 2 for calling the DeltaGeneratorTestCase obj's underlying member method code with example usage: obj.tearDown() without return types