String text = "";
        String field = "content";
        String lang = "en";

        List<AnalyzeToken> tokens = analyzer.analyze(text, field, lang);

        assertNotNull(tokens);
        assertTrue(tokens.isEmpty());
    }

    @Test
    public void testAnalyzeWithNullText() {
        // Test analyze with null text
        String text = null;
        String field = "content";
        String lang = "en";

        String text = "test";
        String field = "content";

        List<String> readings = converter.convert(text, field);

        assertNotNull(readings);
        assertEquals(1, readings.size());
        assertEquals("TEST", readings.get(0));
    }

    @Test
    public void testConvertWithNullField() throws IOException {
        // Test convert with null field
        converter.init();

        return analyzerSettingsIndexName;
    }

    /**
     * Returns the name of the reading analyzer for a given field and language.
     * @param field The field name.
     * @param lang The language.
     * @return The reading analyzer name.
     */
    public String getReadingAnalyzerName(final String field, final String lang) {

                        .startObject("analyzer")
                        .field("reading_analyzer", "test_reading_analyzer")
                        .field("reading_term_analyzer", "test_reading_term_analyzer")
                        .field("reading_analyzer_ja", "test_reading_analyzer_ja")
                        .field("reading_term_analyzer_ja", "test_reading_term_analyzer_ja")
                        .endObject()

        SuggestSettings settings = suggester.settings();
        String field = settings.array().get(SuggestSettings.DefaultKeys.SUPPORTED_FIELDS)[0];

        final QueryLogReader reader = new QueryLogReader() {
            AtomicInteger count = new AtomicInteger();
            String[] queryLogs = new String[] { field + ":検索", field + ":fess", field + ":検索エンジン" };

            @Override
            public QueryLog read() {

     * @param name The name of the field.
     * @param value The value of the field.
     * @return The result data body.
     */
    protected String getResultDataBody(final String name, final String value) {
        // TODO: Support other XML footer types
        // TODO: Support other field types and trimming options

                + "<doc>\n"//
                + "<field name=\"title\"><list><item>タイトル</item></list></field>\n"//
                + "<field name=\"body\"><list><item>第一章 第一節 ほげほげふがふが LINK 第2章 第2節</item></list></field>\n"//
                + "<field name=\"pcount\">2.0</field>\n"//
                + "<field name=\"true\">true</field>\n"//
                + "<field name=\"false\">false</field>\n"//
                + "</doc>";

     *
     * @param q the query string to be parsed
     * @param field the field to be used for keyword extraction
     * @return an array of keywords extracted from the query string, or an empty array if the number of keywords exceeds the maximum allowed or if any keyword exceeds the maximum length
     */
    public static String[] parseQuery(final String q, final String field) {

     * @param name The name of the field.
     * @param value The value of the field.
     * @return The result data body.
     */
    protected String getResultDataBody(final String name, final String value) {
        // TODO support other type
        // TODO trim(default)

                + "<field name=\"email\"><list><item></item><item>******@****.***</item></list></field>\n"//
                + "<field name=\"url\">http://www.taro.com/</field>\n"//
                + "<field name=\"tel\">090-xxxx-xxxx</field>\n"//
                + "</doc>";

        final ResponseData responseData = new ResponseData();
        responseData.setResponseBody(ResourceUtil.getResourceAsFile("extractor/test.xml"), false);