Planning Our Shopping Cart

A shopping cart’s functions

Our store currently lacks any form of checkout process, so we’ll start from scratch as we build our shopping cart. Shopping carts are conceptually very simple—put items in, take items out, and purchase the cart. However, Sneaker23’s sneaker launch process means that we’ll need our shopping cart to go beyond the basics. We need a shopping cart that tells a shopper when an item becomes out-of-stock, so they have a chance to select a different size very quickly.

First, we’ll walk through the requirements of our shopping cart. This will help us stay focused on building the minimal working feature set, and these requirements will drive our acceptance tests. After that, we’ll see our approach to implementing our shopping ...