code: def setUp(self) -> None:
      self._test_dir = tempfile.TemporaryDirectory()
  
      create_file = lambda prefix, suffix: tempfile.NamedTemporaryFile(
          dir=self._test_dir.name,
          prefix=prefix,
          suffix=suffix,
          delete=False,
      )
  
      create_file("01", ".py")
      create_file("02", ".py")
      create_file("03", ".py")
      create_file("04", ".rs")
      create_file(".05", ".py")
  
imports: import tempfile
  import unittest
  from unittest.mock import MagicMock, mock_open, patch
  from streamlit.watcher import util
label_desc: Use image node_id 1 for calling the DirHelperTests obj's underlying member method code with example usage: obj.setUp() without return types