public void test_add_long_int() {
        assertEquals(567L, MillisDurationField.INSTANCE.add(567L, 0));
        assertEquals(567L + 1234L, MillisDurationField.INSTANCE.add(567L, 1234));
        assertEquals(567L - 1234L, MillisDurationField.INSTANCE.add(567L, -1234));
        try {
            MillisDurationField.INSTANCE.add(Long.MAX_VALUE, 1);
            fail();
        } catch (ArithmeticException ex) {}
    }