Description

Checkout Component 3.0 requirements:

1. Design and implement market checkout component with readable API that calculates the total price of a number of items.

2. Checkout mechanism can scan items and return actual price (is stateful)

3. Our goods are priced individually.

4. Some items are multipriced: buy N of them, and they'll cost you Y cents

   Item	Price	Unit	Special Price
   A	40	3	70
   B	10	2	15
   C	30	4	60
   D	25	2	40

5. Client receives receipt containing list of all products with corresponding prices after payment

6. Some items are cheaper when bought together - buy item X with item Y and save Z cents

   Item	Price
   A,B	10
   A,B,C,D	30

7. Additional Discount of 10% should be added if total order price (including other discounts/special prices) exceeds 600

8. Market can add any type of item or discount at any point in time.

9. Market stores data about quantity of all items sold in all its checkouts and all applied discounts

10. Perform a simple simulation of a market with 3 Checkouts and a single queue of 10 random baskets of items.

Environment

I implemented Checkout component using Spring boot and H2 database. Database schema is created on startup and initialized with data declared in file:

data.sql

You can log into database console using link:

localhost:9000/h2Console

Jdbc url, password and login is configured in the file:

application.properties

Usage

Running project:

mvn spring-boot:run

After start, application will run simulation and print results on console. You can also invoke simulation using REST API:

localhost:9000/simulation/{numberOfBaskets}/{maxNumberOfItemsInBasket}

Pitest mutations and code coverage

I used pitest for mutation testing. You can execute

mvn org.pitest:pitest-maven:mutationCoverage

and check pitest report in directory:

target/pit-reports/