MPogson / SupermarketPricing

kata setup

Supermarket Pricing Kata

A unit testing code kata centered around pricing of items in a grocery store

The Problem

Problem statement taken from https://github.com/crmckenzie

Our customer--the owner of a small grocery store--would like us to develop a library to be used during the checkout process to calculate the net total for the shoppers. In general, the net total for a single product is given by quantity * unit price. However, the store owner may decide to offer some products for sale. Some examples of products on sale are "Buy 2 cans of beans get 1 free" or "Buy 3 cans of beans for $4.50."

For Example

Sale	Quantity	Unit Price	Net Total
N/A	1	200	200
	2		400
	3		600
	...		...
Buy 2 Get 1 Free	1	200	200
	2		400
	3		400	Sale Applies
	4		600
	5		800
	6		800	Sale Applies
	...		...
Buy 3 for $4.50	1	200	200
	2		400
	3		450	Sale Applies
	4		650
	5		850
	6		900	Sale Applies
	...		...

Requirements

• Implement the CalculateNetTotal method in the CheckOut class to handle the above sales logic.

Constraints

• You cannot change the signature of CalculateNetTotal.

Other Notes

• The CheckOut class contains a list of Products.
• A Product contains the quantity and unit price.
• You may add new classes or methods as you see fit.
• There is no current representation of the concept of a "sale" in the code. You will need to decide how to model that.
• You will not likely finish the problem in an hour. Don't be discouraged if you see the clock winding down.
• If you are not familiar with C#, you may psuedo-code in the language of your choice and the interviewer will help you translate the syntax to C#.