code: def test_open(self):
      for name in self.files:
          f = open(name, "wb")
          f.write((name + "\n").encode("utf-8"))
          f.close()
          os.stat(name)
          self._apply_failure(os.listdir, name, self._listdir_failure)
  
imports: import os
  import sys
  import unittest
  import warnings
  from unicodedata import normalize
  from test.support import os_helper
  from test import support
label_desc: Use image node_id 5 for calling the UnicodeFileTests obj's underlying member method code with example usage: obj.test_open() without return types