}

    /**
     * Builds the source titles suffix string (e.g., "\n[Referenced documents: Title1, Title2]").
     * Returns an empty string if no sources or titles are available.
     *
     * @param sources the source documents
     * @return the source titles suffix, or empty string
     */
    private String buildSourceTitlesSuffix(final List<ChatSource> sources) {

            logger.debug("Login failed for user: {}", username, e);
        }
        return OptionalEntity.empty();
    }

    /**
     * Checks if the specified LDAP user is allowed to have empty group and role permissions.
     *
     * @param ldapUser the LDAP user to check
     * @return true if empty permissions are allowed, false otherwise
     */
    protected boolean allowEmptyGroupAndRole(final LdapUser ldapUser) {

                            groupList.add(id);
                        }
                        processParentGroup(user, groupList, roleList, id);
                    } else {
                        logger.warn("id is empty: {}", memberOf);
                    }
                    final String[] names = fessConfig.getEntraIdPermissionFields();
                    final boolean useDomainServices = fessConfig.isEntraIdUseDomainServices();

     *
     * @return the language instruction string, or empty string if locale is English
     */
    protected String getLanguageInstruction() {
        final Locale locale = getUserLocale();
        final String language = locale.getLanguage();
        if ("en".equals(language)) {
            return StringUtil.EMPTY;
        }

        assertEquals("Exported 0 documents.", result);
    }

    // --- Edge cases ---

    @Test
    public void test_buildFilePath_emptyString() {
        // Empty string is a valid relative URI with null host and empty path
        final Path result = indexExportJob.buildFilePath("/export", "", new HtmlIndexExportFormatter());
        assertEquals(Path.of("/export/_local/index.html"), result);
    }

                } catch (final IOException e) {
                    throw new IORuntimeException(e);
                }
                return true;
            }, OptionalThing.empty());
            response.flushBuffer();
            if (logger.isDebugEnabled()) {
                logger.debug("Loaded {} documents", count);
            }

    }

    default void setDefaultLabelValue(final String value) {
        setSystemProperty(Constants.DEFAULT_LABEL_VALUE_PROPERTY, value);
        propMap.remove(DEFAULT_LABEL_VALUES);
    }

    default String getDefaultLabelValue() {
        return getSystemProperty(Constants.DEFAULT_LABEL_VALUE_PROPERTY, StringUtil.EMPTY);
    }

# Encoding for file names in documents.
crawler.document.file.name.encoding=
# Label to use when a file has no title.
crawler.document.file.no.title.label=No title.
# Whether to ignore files with empty content.
crawler.document.file.ignore.empty.content=false
# Maximum length of file title in documents.
crawler.document.file.max.title.length=100
# Maximum length of file digest in documents.
crawler.document.file.max.digest.length=200

								</source>
							</sources>
						</mapping>
						<!-- logs (empty) -->
						<mapping>
							<directory>${packaging.fess.log.dir}</directory>
						</mapping>
						<!-- temp (empty) -->
						<mapping>
							<directory>${packaging.fess.temp.dir}</directory>
						</mapping>
						<!-- dictionary (empty) -->
						<mapping>
							<directory>${packaging.fess.dictionary.dir}</directory>

    @Test
    public void test_buildRoleQuery_emptyRoleSet() {
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        queryHelper.buildRoleQuery(Set.of(), boolQuery);

        // Should add empty role query filter
        assertTrue(boolQuery.toString().contains("filter"));
    }

    @Test
    public void test_buildRoleQuery_withRoles() {
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();