He wants you to implement a simple basket feature for him.
In this challenge, you will transform User Stories into a Domain Model and test-drive developing a program that satisfies the stories.
A User Story describes one thing a program is expected to do, from the perspective of somebody using that program. When planning a program, the client's requirements will be decomposed into many User Stories. Much of a developer's life is spent translating User Stories into a functional system. In Object-Oriented Programming, these systems are made up of Objects and Messages. Objects describe the objects within the system, and Messages describe how those objects interact. We call these systems Domain Models.
# Part 1
As a member of the public
So I can order a bagel when I want to
I'd like to add an item to my basket
As a member of the public,
So that I can change my order
I'd like to remove an item from my basket
# Part 2
As a member of the public,
So that I can not overfill my small bagel basket
I'd like to know when my basket is full when I try adding an item beyond my basket capacity.
As a Bob's Bagels manager,
So that I can record more sales
I’d like to create baskets with larger capacity when I need to.
As a member of the public
So that I can maintain my sanity
I'd like to know if I try to remove an item that doesn't exist in my basket.
# Part 3
As a member of the public,
So that I can know how much my bagels are,
I’d like to see the price of each item before I add it to my basket.
As a member of the public
So that I can buy many of my favorite bagel
I'd like to be able to add the same type of bagel to my basket more than once
As a member of the public,
So that I can prepare to pay
When I go to checkout I'd like to know the total sum of the bagels in my basket