}

    public void setDisplayName(String value) {
        registerModifiedProperty("displayName");
        this.displayName = value;
    }

    public String getEmployeeNumber() {
        checkSpecifiedProperty("employeeNumber");
        return convertEmptyToNull(employeeNumber);
    }

    public void setEmployeeNumber(String value) {

    }

    @Test
    public void test_user_employeeNumber() {
        final User user = new User();
        assertNull(user.getEmployeeNumber());

        user.setEmployeeNumber("EMP001");
        assertEquals("EMP001", user.getEmployeeNumber());
    }

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

        final String attrEmployeeNumber = fessConfig.getLdapAttrEmployeeNumber();
        OptionalUtil.ofNullable(user.getEmployeeNumber())
                .filter(StringUtil::isNotBlank)
                .ifPresent(s -> modifyReplaceEntry(modifyList, attrEmployeeNumber, s))