final DOMSource source = new DOMSource(node);
        transformer.transform(source, result);

        return writer.toString();
    }

    @Test
    public void test_getChildUrlRules() {
        assertEquals("", new FessXpathTransformer() {
            protected Map<String, String> getConfigPrameterMap(final ResponseData responseData, final ConfigName config) {
                return Map.of();