A c# implementation of a shopping basket that allows different discounts

You can add different Items to your ShoppingBasket, and when you CalculateTotal, it will show you the amount to pay, taking into account all the different Discounts that were definted.

##Install & Run tests

1. clone this repo
2. build in Visual Studio (this should also restore packages)
3. run tests in Visual Studio ctrl + R + A
   (this project doesn't have a GUI / CLI; it's just a demo of the business logic implementation)

##About the solution This solution, like its parallel Ruby implementation, uses the visitor pattern to separate the implementation of the ShoppingBasket and the different Discounts.
The ShoppingBasket will apply all the predefined discounts on itself, allowing different discounts with different logic to be implemented separately.

In this case, we defined two different Discounts that have different logic (one that's of the type "buy X get Y free", and one of the type "buy X of product A, and get a Y% discount on product B").

##What can be improved Obviously this is just a little demo thing; It can be improved in the following ways:

• Adding some sort of interface
• Using Value Objects to make sure parameters are within permitted range (i.e quantity should only be positive)
• Creating an ItemInBasket class instead of using the much less obvious KeyValuePair<Item,int> all over the place.