code: def setUp(self):
      self.patch1 = patch("streamlit.file_util.os.stat")
      self.os_stat = self.patch1.start()
  
imports: import errno
  import os
  import unittest
  from unittest.mock import MagicMock, mock_open, patch
  import pytest
  from streamlit import file_util, util
label_desc: Use image node_id 1 for calling the FileUtilTest obj's underlying member method code with example usage: obj.setUp() without return types