LateRooms Checkout Kata by Martin Steel

This is an implementation of the LateRooms Checkout Kata by Martin Steel

There is one public interface fo the Checkout, ICheckout defined below.

public interface ICheckout
{
    bool Scan(string sku);
    int GetTotalPrice();
}

Public methods

Scan(string sku) Add an item to be purchased identified by its Stock Keeping Unit (SKU)

GetTotalPrice() Once all items are added get the total cost of the items being purchased.

SKUs and prices used in tests (from the Kata description)

SKU	Unit Price	Special Price
A	50	3 for 130
B	30	2 for 45
C	20
D	15

Implementation

A concrete implementation of the ICheckout interface can be found in the Checkout class. The public constructor requires an IProductRepository as an argument. The IProductRepository interface defines a public interface for retrieving products by SKU. In production I would expect this to be a products database or equivalent.

Testing

The CheckoutTests project uses NUnit to test the Checkout implementation.

For testing purposes the IProductRepository interface is mocked with Moq in the test SetUp function. The mocked implementation supports the four SKUs defined in the Kata.

Requirements

• Tested in Visual Studio 2017 RC2 (should also work in earlier versions)
• Requires .NET 4.6.2
• NuGet 3 (Package restore will install NUnit)