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(minusOne, minus.Execute(zero, one));
Assert.AreEqual(one, minus.Execute(zero, minusOne));
Assert.AreEqual(minusOne, minus.Execute(one, two));
}