Tennis

Summary

This kata is well suited to developers who have some familiarity with TDD basics and want to improve their algorithm design skills. It is a stateless, algorithmic version of the classic Tennis kata (where the program also holds the current score and updates its state when a player scores a new point).

Both Tennis and Bowling can also be done holding state (e.g. with a scorePoint() method of some sort). However, when learning pure algorithmic TDD, we prefer to stay stateless as the added difficulty of maintaining state can distract from the main learning points.

Instructions

Write a program that accepts two integers, and converts them to a tennis-style score.

The scoring rules of tennis (per Wikipedia) are as follows:

• A game is won by the first player to have won at least four points in total and at least two points more than the opponent.
• Scores from zero to three points are described as “love”, “fifteen”, “thirty”, and “forty” respectively.
• If at least three points have been scored by each player and the scores are equal, the score is “deuce”.
• If at least three points have been scored by each player and a player has one more point than his opponent, the score is “advantage” for the player in the lead.

Start with with the following interface:

public class TennisScoreCalculator {
    public string Score(int player1Points, int player2Points);
}