def METHOD_NAME(self):
    # Just checking the new file case.
    # Assume the existing file timestamp case will work if this does.
    with TemporaryDirectory() as base_dir:
        new_file_path = Path(base_dir) / "new_file"
        assert not new_file_path.exists()
        util.touch(new_file_path)
        assert new_file_path.exists()