public void testPlus_int() {
        Minutes test2 = Minutes.minutes(2);
        Minutes result = test2.plus(3);
        assertEquals(2, test2.getMinutes());
        assertEquals(5, result.getMinutes());
        
        assertEquals(1, Minutes.ONE.plus(0).getMinutes());
        
        try {
            Minutes.MAX_VALUE.plus(1);
            fail();
        } catch (ArithmeticException ex) {
            // expected
        }
    }