}

    @Test
    public void test_defaultConstructor() {
        final UserService service = new UserService();
        assertNotNull(service);
    }

    @Test
    public void test_userPager_initialization() {
        final UserPager pager = new UserPager();
        assertNull(pager.id);
        assertEquals(1, pager.getCurrentPageNumber());
    }

    @Test
    public void test_user_surnameDefaultsToName() {