def test_prestodelta_opening_closing_tags(self):

        path = os.path.join(self.metadata_file_dir, REPO_DATA_DIR_NAME, PRESTO_DELTA_FILE_NAME)

        context = PrestodeltaXMLFileContext(self.metadata_file_dir)

        context._open_metadata_file_handle()

        self.assertRaises(NotImplementedError, context._write_root_tag_close)

        context._write_root_tag_open()

        try:
            context._write_root_tag_close()

        except Exception, e:
            self.fail(e.message)