}

    /**
     * Test getAnchorSet with blank string
     */
    @Test
    public void test_getAnchorSet_withBlankString() {
        FessCrawlerThread crawlerThread = new FessCrawlerThread();

        Set<RequestData> result = crawlerThread.getAnchorSet("");
        assertNull(result, "getAnchorSet should return null for blank string");

        result = crawlerThread.getAnchorSet("   ");

        assertEquals(expected, ldapManager.escapeLDAPSearchFilter(input));
    }

    // ========================================================================
    // Tests for Defensive Null/Blank Checks
    // ========================================================================

    @Test
    public void test_getSAMAccountGroupName_withNullBindDn() {
        LdapManager ldapManager = new LdapManager();

        super.setUp(testInfo);
        notificationHelper = new NotificationHelper();
    }

    @Test
    public void test_sendToSlack_withBlankWebhookUrls() {
        // Setup mock configuration with blank webhook URLs
        ComponentUtil.setFessConfig(new MockFessConfig() {
            @Override
            public String getSlackWebhookUrls() {
                return "";
            }
        });

        assertEquals("others", fileTypeHelper.get(" "));
    }

    @Test
    public void test_get_withBlankFiletype() {
        fileTypeHelper.add("test/blank", "");
        assertEquals("others", fileTypeHelper.get("test/blank"));

        fileTypeHelper.add("test/null", null);
        assertEquals("others", fileTypeHelper.get("test/null"));
    }

    @Test
    public void test_getDefaultValue() {

    }

    /**
     * Extracts the virtual host key from a RelatedQuery entity.
     * If the virtual host is blank or null, returns an empty string.
     *
     * @param entity the RelatedQuery entity to extract the host key from
     * @return the virtual host key, or empty string if blank or null
     */
    protected String getHostKey(final RelatedQuery entity) {
        final String key = entity.getVirtualHost();

        // Verify
        assertTrue(result.isPresent());
        assertEquals(Locale.UK, result.get());
    }

    // Test findBusinessLocale with blank parameter name
    @Test
    public void test_findBusinessLocale_withBlankParameterName() {
        // Setup mock config with blank parameter name
        FessConfig mockConfig = new FessConfig.SimpleImpl() {
            @Override

     * <ul>
     * <li>Checks if username and password are not blank</li>
     * <li>Verifies LDAP admin is enabled for the user</li>
     * <li>Confirms the user exists in LDAP directory</li>
     * </ul>
     *
     * @param username the username of the user (must not be null or blank)
     * @param password the new password (must not be null or blank)
     * @return true if the password was changed successfully, false otherwise

    public void addClient(final String regex, final CrawlerClient client) {
        if (StringUtil.isBlank(regex)) {
            throw new CrawlerSystemException(
                    "URL pattern regular expression is null or blank. Cannot register client without a valid pattern.");
        }
        if (client == null) {
            throw new CrawlerSystemException("CrawlerClient instance is null. Cannot register null client.");
        }

        chars[0] = Character.toUpperCase(chars[0]);
        return new String(chars);
    }

    /**
     * Returns true if the string is blank.
     *
     * @param str
     *            the string to check
     * @return {@literal true} if the string is blank
     */
    public static boolean isBlank(final String str) {
        if (str == null || str.length() == 0) {
            return true;
        }

            action.validateFilePath("");
            fail("Expected IllegalArgumentException");
        } catch (final IllegalArgumentException e) {
            assertTrue("Error message should indicate blank path: " + e.getMessage(), e.getMessage().contains("blank"));
        }
    }

    // ===================================================================================