public void IntTest()
{
Integer minusOne = new Integer(-1);
Integer zero = new Integer(0);
Integer one = new Integer(1);
Integer two = new Integer(2);
Assert.AreEqual(zero, plus.Execute(zero, zero));
Assert.AreEqual(one, plus.Execute(zero, one));
Assert.AreEqual(one, plus.Execute(one, zero));
Assert.AreEqual(two, plus.Execute(one, one));
Assert.AreEqual(zero, plus.Execute(minusOne, one));
Assert.AreEqual(minusOne, plus.Execute(minusOne, zero));
}