public void LiteralInteger_GivenInteger_ReturnsIntegerLiteral(int input, int expected)
{
IntegerLiteralExpression intLit = new IntegerLiteralExpression(input.ToString(), 1, 1);
IInterpreterInteger parent = Substitute.For <IInterpreterInteger>();
parent.DispatchInt(intLit, Arg.Any <List <object> >()).Returns(input);
IntegerHelper integerHelper = SetUpHelper(parent);
int res = integerHelper.LiteralInteger(intLit, new List <object>());
Assert.AreEqual(expected, res);
}