}

    // Helper method to create test user
    private User createTestUser(String username, String displayName) {
        User user = new User();
        user.setName(username);
        user.setDisplayName(displayName);
        return user;
    }

    // Test implementation of AuthenticationChain for testing
    private static class TestAuthenticationChain implements AuthenticationChain {

                setAttributeValue(result, fessConfig.getLdapAttrRegisteredAddress(), o -> user.setRegisteredAddress(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrDisplayName(), o -> user.setDisplayName(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrPreferredLanguage(), o -> user.setPreferredLanguage(o.toString()));