Nelkinda Uropia Tax Kata

The Uropia Tax Kata is a kata by Nelkinda Software Craft for calculating bills and receipts in the fictional country Uropia.

Requirements

On each purchase, the government of Uropia imposes a variety of taxes and deposits that depend on several criteria. The taxes are cumulative.

Price shown to customer

The price shown to the customer must always be the gross price, including all taxes and deposits. Taxes are rounded mathematically. Taxes apply per item.

Sales Tax

The sales tax depends on the category of the article. The following sales taxes apply:

• educational material (books etc), food (all organic food; processed foods with a sugar content <10g/kg), medical, electronics: 0%
• luxury items (cars; processed foods with sugar content >=10g/kg) : 50%
• everything else 10%

Environment Deposit

The environment deposit is a deposit buyers make at the time of the purchase that will be refunded when they return the product to the shop for recycling. The environment deposit is not taxed.

• electronics: 40% of the net price
• recycling containers (bottles, cans, tins, etc): €0.50

Examples

Purchase 1

Basket

1 e-book "XP 2.0" @ €12.49
1 bar of chocolate @ €2.25 (package weight 2g)

Receipt

1 e-book "XP 2.0" 12.50
1 bar of choc  2.25

Total:            14.75

Sales Tax 50%:     0.75

Purchase 2

Basket

5 cans of coke @ €0.99
1 bar of chocolate @ €2.25 (package weight 2g)

Receipt

5 coke (can)      1.49
                   7.45
1 bar of choc     2.25
                   
Total:            9.70

Deposit:           2.50
Sales Tax 50%:     2.40

Expected Outcome

• The above examples (specifications) should be converted into executable tests using Cucumber and Gherkin.
• The solution should be developed using TDD, BDD, 4 rules of simple design. Jacoco is provided in the above template to measure the code coverage.
• Static code analysis tools are enabled by default to ensure good code quality.
• Makefile is provided as a wrapper for Gradle with all essential commands to build, test and run the code. Feel free to modify it as per your requirement.

Tools / Tech Stack

Backend

• Programming Language: Java (Java 15)
• Build Tool: Gradle
• Verification Tools: Checkstyle, PMD, SonarLint, JUnit, Cucumber, Jacoco, PiTest, SonarQube

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