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 {

        assertEquals("RAdministrators", permissionHelper.encode("{role}Administrators"));
        assertEquals("D1user with spaces", permissionHelper.encode("(deny){user}user with spaces"));
        assertEquals("DR_role_with_underscores", permissionHelper.encode("(deny){role}_role_with_underscores"));
        assertEquals("D2group123", permissionHelper.encode("(deny){group}group123"));

        // Default constructor
    }

    /**
     * Quotes a string value if it contains spaces.
     * Multi-word values are wrapped in double quotes with internal quotes replaced by spaces.
     *
     * @param value the string value to quote
     * @return the quoted string if it contains spaces, otherwise the original value
     */
    protected String quote(final String value) {

    }

    @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"));

    }

    @Test
    public void test_render_paragraphWithLineBreak() {
        String markdown = "Line 1  \nLine 2";
        String result = markdownRenderer.render(markdown);
        // Two spaces at end of line creates a line break
        assertTrue(result.contains("<br"));
    }

    @Test
    public void test_render_specialHtmlEntities() {

        String[] result;

        // Leading and trailing spaces
        value = " value1 , value2 , value3 ";
        result = KuromojiCSVUtil.parse(value);
        assertEquals(3, result.length);
        assertEquals(" value1 ", result[0]);
        assertEquals(" value2 ", result[1]);
        assertEquals(" value3 ", result[2]);

        // Spaces in quoted values
        value = "\" spaced value \",\"  another  \"";

        value = "key.with.dots=value\nkey_with_underscores=value with spaces\nkey-with-dashes=value@#$%";
        paramMap = ParameterUtil.parse(value);
        assertEquals(3, paramMap.size());
        assertEquals("value", paramMap.get("key.with.dots"));
        assertEquals("value with spaces", paramMap.get("key_with_underscores"));
        assertEquals("value@#$%", paramMap.get("key-with-dashes"));
    }