Score Keeper Kata​

The Score Keeper Kata is a beginner-friendly coding exercise designed to help you practice Test-Driven Development (TDD). 

Scenario

You're tasked with developing software for a basketball scoreboard. The end-users require a simple interface with six buttons:​

• Three buttons for Team A to add 1, 2, or 3 points.
• Three buttons for Team B to add 1, 2, or 3 points.​

The scoreboard should display the current score in a fixed format: 000:000, where each team's score is always represented by three digits.

Your Task

You can begin by implementing a class named ScoreKeeper with the following methods:​

scoreTeamA1()
scoreTeamA2()
scoreTeamA3()
scoreTeamB1()
scoreTeamB2()
scoreTeamB3()
getScore()

Each scoreTeamXn() method should increment the respective team's score by n points. The getScore() method should return the current score in the 000:000 format.

Constraints

• The score display must always be seven characters long, maintaining leading zeros as needed.
• Focus on writing clean, maintainable code with comprehensive test coverage.
• Adopt an outside-in TDD approach: start by writing tests for the ScoreKeeper interface before implementing the internal logic.​

Suggested TDD Workflow

1. Red: Write a failing test for the initial functionality (e.g., scoreTeamA1() should increase Team A's score by 1).
2. Green: Implement the minimal code required to pass the test.
3. Refactor: Clean up the code while ensuring all tests still pass.
4. Repeat the cycle for each method and edge case.

Learning Objectives

• Practice the outside-in approach to TDD.
• Understand how to design a simple API that meets user requirements.
• Enhance skills in writing clear and effective unit tests.
• Experience collaborative coding through pair programming.​

Links

• Find the basic setup here.
• Find our solution here.

Time to play!

Feel free to play with this small interface based on our Kata solution.