public void TestDivision()
        {
            IFancyCalculator x = new FancyCalculator();

            x.Push(2);
            x.Push(4);
            x.Push(2);
            x.Divide();
            Assert.IsTrue(x.Top() == 0.5);
            x.Divide();
            Assert.IsTrue(x.Top() == 0.125);
        }