In this example, we'll ask you to build a ShoppingCart class which contains multiple items, and provides a method of adding, removing and updating items belonging to a cart. The ShoppingCart class is a plain Ruby class, which should only use objects which belong to the standard Ruby library.
First, fork this example. Click 'Fork' above. Then, you'll clone, edit, add, commit and push your changes as necessary. Notify us with a link to your forked example when you're finished.
Please first develop tests (either using TDD or BDD libraries of your choice -- we like Test::Unit and RSpec, but you're free to use whatever method you're comfortable with) before you write actual code. We're a test-driven shop.
The ShoppingCart class should contain an array of items, and each item should have an ID, a price and a quantity.
Here are some stories you should complete:
- Should be able to add an item to the shopping cart
- Should be able to remove an item from the shopping cart
- Should be able to update the quantity and price of an item in the shopping cart
- Should be able to calculate the total for the shopping cart
- Should be able to empty the shopping cart
- Should remove an item from the cart if the quantity falls below zero
- Should ensure an item's price is always greater than or equal to zero
If you have any questions, please email joshua.delsman@rovicorp.com.