public void testMinus_int() {
        Hours test2 = Hours.hours(2);
        Hours result = test2.minus(3);
        assertEquals(2, test2.getHours());
        assertEquals(-1, result.getHours());
        
        assertEquals(1, Hours.ONE.minus(0).getHours());
        
        try {
            Hours.MIN_VALUE.minus(1);
            fail();
        } catch (ArithmeticException ex) {
            // expected
        }
    }