tomaytotomato / pair-programming-task

A pair programming task

Game of Tennis Refactoring Kata

Time Limit

1 hour (60 mins)

Situation

The Wimbledon Tennis Company employed a software developer to create a tennis scoring application.

Unfortunately, the developer has taken a new job before the application could be declared finished.

You have been hired by the company to evaluate the codebase of this application and make any necessary changes to it.

The desired outcome of this should be that the application functions and performs to the specified business requirements.

Business Rules

The application uses the standard scoring rules for Tennis.

Points	Description
0	Love
1	Fifteen
2	Thirty
3	Forty
4	Win

For a tennis player to win a game, they must win with at least a two point lead.

If the score is tied at 40 to 40 (what is called as a Deuce), a player must earn two consecutive points (an Advantage point and Point) to win the game.

If the player who has an Advantage point loses the next point, then it reverts back to Deuce once again.

For the sake of simplicity, we are only implementing the scoring of one game.

Example 1 - "Alice wins"

Action	Bob	Alice	Output
Game starts	0	0	Love-All
Alice scores	0	15	Love-Fifteen
Bob scores	15	15	Fifteen-All
Alice scores	15	30	Fifteen-Thirty
Alice scores	15	40	Fifteen-Forty
Alice scores	15	Win	Win for Alice

Example 2 - "Deuce"

Action	Bob	Alice	Output
Game starts	0	0	Love-All
Bob scores	15	0	Fifteen-Love
Bob scores	30	0	Thirty-Love
Alice scores	30	15	Thirty-Fifteen
Alice scores	30	30	Thirty-All
Alice scores	30	40	Thirty-Forty
Bob scores	40	40	Deuce

Example 3 - "Advantage"

Advantage occurs when both players are at Deuce and one player scores, resulting in them having an advantage.

If they score again, they win.

Action	Bob	Alice	Output
	40	40	Deuce
Alice scores	40	Adv	Advantage for Alice
Alice scores	40	Win	Win for Alice

Application Overview

The application is built with Spring Boot and provides a single RESTful endpoint to score and report back the score for a given Game of Tennis.

The application also sends the score of the game to be displayed on a scoreboard seen by the audience.

There is no Database or other persistence being used by the application.