new_contents: from setuptools import unicode_utils
  
  
  def test_filesys_decode_fs_encoding_is_None(monkeypatch):
      """
      Test filesys_decode does not raise TypeError when
      getfilesystemencoding returns None.
      """
      monkeypatch.setattr('sys.getfilesystemencoding', lambda: None)
      unicode_utils.filesys_decode(b'test')
  
subject: Add test capturing failure. Ref #486.