public void test_add_long_int() {
        assertEquals(567L, iField.add(567L, 0));
        assertEquals(567L + 1234000L, iField.add(567L, 1234));
        assertEquals(567L - 1234000L, iField.add(567L, -1234));
        try {
            iField.add(LONG_MAX, 1);
            fail();
        } catch (ArithmeticException ex) {}
    }