}

        /**
         * Checks if a previous page exists.
         *
         * @return true if there is a previous page, false otherwise
         */
        public boolean isExistPrePage() {
            return currentPageNumber != 1;
        }

        /**
         * Checks if a next page exists.
         *
         * @return true if there is a next page, false otherwise
         */

    }

    @Test
    public void test_userPager_existPrePage() {
        final UserPager pager = new UserPager();
        assertFalse(pager.isExistPrePage());

        pager.setExistPrePage(true);
        assertTrue(pager.isExistPrePage());
    }

    @Test
    public void test_userPager_existNextPage() {
        final UserPager pager = new UserPager();