}

    @Test
    public void test_user_pager() {
        final User user = new User();
        assertNull(user.getPager());

        user.setPager("PAGE001");
        assertEquals("PAGE001", user.getPager());
    }

    @Test
    public void test_user_preferredLanguage() {
        final User user = new User();
        assertNull(user.getPreferredLanguage());

        final String attrPager = fessConfig.getLdapAttrPager();
        OptionalUtil.ofNullable(user.getPager())
                .filter(StringUtil::isNotBlank)
                .ifPresent(s -> modifyReplaceEntry(modifyList, attrPager, s))