Shopping cart kata

Most businesses sell their products online by means of an e-commerce site which provides a real-life experience taking advantage of the shopping cart capability.

Overview

A company wants to sell online the following products:

Code         | Name                     |  Price
--------------------------------------------------
VOUCHER      | AcME Voucher             |   5.00 €
TSHIRT       | AcME T-Shirt             |  20.00 €
MUG          | AcME Coffee Mug          |   7.50 €

Examples

Items: VOUCHER, TSHIRT, MUG
Subtotal: 32.50€

Goal

• Create a testing suite that can be confidently used to test your code.
  • Contract Tests (Unit test controllers)
  • Acceptance tests (Scenarios covering everything except repositories)
  • Unit Tests (Unit testing Entities, use cases, and domain services)
  • Integration tests (Testing the real repository implementation)
  • E2E tests (already exists)

Requirements

Your tests code should be a first level citizen, treat it as production code.

Extension

• Two different offers will be used to boost sales:
  • buy one get one free (aka two for the price of one)
  • multibuy discount (buying at least a quantity of a product its unit price is discounted)
• The promotional strategy planned by the company is to apply:
  • buy one get one free to VOUCHER items
  • multibuy discount to TSHIRT items for a quantity of 3 or more and reducing the unit price to 19.00 €

Extension examples

Items: VOUCHER, TSHIRT, VOUCHER
Subtotal: 25.00€

Items: TSHIRT, TSHIRT, TSHIRT, VOUCHER, TSHIRT
Subtotal: 81.00€

Items: VOUCHER, TSHIRT, VOUCHER, VOUCHER, MUG, TSHIRT, TSHIRT
Subtotal: 74.50€