final String html = new HtmlIndexExportFormatter().format(source, Collections.emptySet());

        assertTrue(html.contains("fess:field<with>special"));
    }

    @Test
    public void test_execute_emptyExcludeFields() {
        final Map<String, Object> doc = new LinkedHashMap<>();
        doc.put("url", "https://example.com/page.html");
        doc.put("title", "Test");
        doc.put("content", "Body");