code: def setUp(self):
      self.mgr = MemoryUploadedFileManager("/mock/upload")
  
file_path: streamlit/lib/tests/streamlit/runtime/uploaded_file_manager_test.py
imports: import unittest
  from streamlit.runtime.memory_uploaded_file_manager import MemoryUploadedFileManager
  from streamlit.runtime.stats import CacheStat
  from streamlit.runtime.uploaded_file_manager import UploadedFileRec
  from tests.exception_capturing_thread import call_on_threads
label_desc: Use image node_id 1 for calling the UploadedFileManagerTest obj's underlying member method code with example usage: obj.setUp() without return types