We value the ability to model problems in software, so our first assessment will be around that subject. The exercise is to model and code a simple supermarket pricing solution and it is inspired on PragDave Supermaket Kata.

Please read through the description carefully and implement a solution for it. We don't want you to over-engineer the solution but be prepared to extend the functionality in the next step of the interview process. Please dedicate around 3 hours to do the exercise and then send it back for review. Don't get concerned if the feedback is to complete the exercise!

Please create a local repository using git or and then commit locally. When you have finished please zip up the whole folder (including .git folder) and email to us ([email protected]) within 3 days. We will then review it within 2 days. We provide a project skeleton in Maven, but feel free to use whatever build tool you like (gradle, etc).

Good Luck!

• Working software!
• Tests
• A working build
• Small checkins with good comments
• Put your notes in NOTES.md (maybe talk about trade offs and design decisions)
• Simple code (but not necessarily easy!)
• The less libraries the better, we want to see your code but if you want to use X then say why in your readme.
• We value good domain names and modelling
• Immutability

• If you get to the next stage we will pair on your code
• We will add some more features
• Maybe refactor some things
• Be prepared to talk about your code
• Understand alternatives of design decisions

You have the task to write a component that can calculate the total amount to pay for a supermarket basket. Products are sold by unit or weight, for example 1 coke or 0.450kg of oranges. The supermarket also wants to provide discounts on certain item combinations, for example:

• Three cans of beans for the price of two.
• Two cans of Coke, for £1.

Use the following example of a receipt to know what data needs to be available. There's no requirement to format or print a receipt.

Beans                0.50
Beans                0.50
Beans                0.50
Coke                 0.70
Coke                 0.70
Oranges
0.200 kg @  £1.99/kg 0.40
                    -----
Sub-total            3.30

Savings
Beans 3 for 2       -0.50
Coke 2 for £1       -0.40
                    -----
Total savings       -0.90
-------------------------
Total to Pay         2.40