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