public void AddTwoIntegersUsingParameters()
{
IFunction add = new CombineFunction(new CombineFunction(new AddIntegerFunction(), new ParameterFunction(0, 0)), new ParameterFunction(1, 0));
IFunction result = add.Bind(new IFunction[] { new ConstantFunction(1), new ConstantFunction(2) });
Assert.IsNotNull(result);
Assert.IsInstanceOfType(result, typeof(ConstantFunction));
Assert.AreEqual(3, result.Value);
}