System.setProperty("empty", "");
        String value = "${empty}";
        assertEquals("", ResourceUtil.resolve(value));

        // Test property with just spaces
        System.setProperty("spaces", "   ");
        value = "${spaces}";
        assertEquals("   ", ResourceUtil.resolve(value));

        // Test long property name
        System.setProperty("very.long.property.name.with.many.dots", "long");

        pathMappingList.add(pathMapping);

        pathMappingHelper.cachedPathMappingList = pathMappingList;

        String text = "\"file:///home/user with spaces/\"";
        assertEquals("\"http://localhost/user with spaces/\"", pathMappingHelper.replaceUrls(text));
    }

    @Test
    public void test_replaceUrl_withSpecialCharacters() {
        final String sessionId = "test";

        String name = "param-name_123!@#";
        String[] values = { "value with spaces", "value@special#chars", "日本語" };
        RequestParameter param = new RequestParameter(name, values);

        assertEquals(name, param.getName());
        assertNotNull(param.getValues());
        assertEquals(3, param.getValues().length);
        assertEquals("value with spaces", param.getValues()[0]);

            System.clearProperty(Constants.FESS_CONFIG_PREFIX + testKey);
        }
    }

    // Test property with spaces
    @Test
    public void test_get_propertyWithSpaces() {
        String testKey = "property.with.spaces";
        String valueWithSpaces = "  value with spaces  ";
        System.setProperty(Constants.FESS_CONFIG_PREFIX + testKey, valueWithSpaces);

        try {

        @SuppressWarnings("unchecked")
        final Map<String, StateData> states = (Map<String, StateData>) session.getAttribute(STATES);
        if (states != null) {
            final long now = ComponentUtil.getSystemHelper().getCurrentTimeAsLong();
            states.entrySet()
                    .stream()

    default String[] getCrawlerDocumentSpaces() {
        String[] spaces = (String[]) propMap.get(CRAWLER_DOCUMENT_SPACES);
        if (spaces == null) {
            spaces = Arrays.stream(getCrawlerDocumentSpaceCharsAsArray()).mapToObj(Character::toString).toArray(n -> new String[n]);
            propMap.put(CRAWLER_DOCUMENT_SPACES, spaces);
        }
        return spaces;
    }

    }

    @Test
    public void test_getDetectText_whitespaceNormalization() {
        String text = "Text   with\tmultiple\n\r  spaces";
        String result = languageHelper.getDetectText(text);
        assertEquals("Text with multiple spaces", result);
    }

    @Test
    public void test_getSupportedLanguage_supported() {
        assertEquals("ja", languageHelper.getSupportedLanguage("ja"));

    public String getNewOutput() {
        return newOutput;
    }

    /**
     * Sets the new output character sequence for update operations.
     * Newline characters in the output are automatically replaced with spaces.
     *
     * @param newOutput the new output sequence to set
     */
    public void setNewOutput(final String newOutput) {
        this.newOutput = newOutput == null ? null : newOutput.replace("\n", " ");
    }

     *
     * @param validationMessagesLambda lambda function that adds validation messages
     * @return concatenated string of localized validation messages separated by spaces
     */
    protected String getMessage(final VaMessenger<FessMessages> validationMessagesLambda) {
        final FessMessages messages = new FessMessages();
        validationMessagesLambda.message(messages);

/**
 * FessIntervalController extends DefaultIntervalController to provide
 * Fess-specific interval control functionality for web crawling operations.
 * This controller manages delays and timing for various crawling states
 * including processing delays, queue waiting times, and new URL discovery.
 */
public class FessIntervalController extends DefaultIntervalController {