this.gidNumber = value;
    }

    public String getGivenName() {
        checkSpecifiedProperty("givenName");
        return convertEmptyToNull(givenName);
    }

    public void setGivenName(String value) {
        registerModifiedProperty("givenName");
        this.givenName = value;
    }

    public String[] getGroups() {
        checkSpecifiedProperty("groups");
        return groups;

        setupEpg(_epgMap, et -> ((User) et).getGidNumber(), (et, vl) -> ((User) et).setGidNumber(DfTypeUtil.toLong(vl)), "gidNumber");
        setupEpg(_epgMap, et -> ((User) et).getGivenName(), (et, vl) -> ((User) et).setGivenName(DfTypeUtil.toString(vl)), "givenName");
        setupEpg(_epgMap, et -> ((User) et).getGroups(), (et, vl) -> ((User) et).setGroups((String[]) vl), "groups");

            result.setFacsimileTelephoneNumber(DfTypeUtil.toString(source.get("facsimileTelephoneNumber")));
            result.setGidNumber(DfTypeUtil.toLong(source.get("gidNumber")));
            result.setGivenName(DfTypeUtil.toString(source.get("givenName")));
            result.setGroups(toStringArray(source.get("groups")));
            result.setHomeDirectory(DfTypeUtil.toString(source.get("homeDirectory")));

    }

    @Test
    public void test_user_givenName() {
        final User user = new User();
        assertNull(user.getGivenName());

        user.setGivenName("John");
        assertEquals("John", user.getGivenName());
    }

    @Test
    public void test_user_surname() {
        final User user = new User();
        assertNull(user.getSurname());

                setAttributeValue(result, fessConfig.getLdapAttrSurname(), o -> user.setSurname(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrGivenName(), o -> user.setGivenName(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrMail(), o -> user.setMail(o.toString()));