TennisGame.php

<?php
/**
 * Created by PhpStorm.
 * User: JoeyChen
 * Date: 2017/12/2
 * Time: 下午 01:28
 */


namespace JoeyDojo;

class TennisGame
{
    private $_firstPlayerScoreTimes = 0;
    private $_secondPlayerScoreTimes = 0;
    private $lookup = [
        0 => "Love",
        1 => "Fifteen",
        2 => "Thirty",
        3 => "Forty",
    ];
    private $_firstPlayerName;
    private $_secondPlayerName;

    /**
     * TennisGame constructor.
     * @param $firstPlayerName
     * @param $secondPlayerName
     */
    public function __construct($firstPlayerName, $secondPlayerName)
    {
        $this->_firstPlayerName = $firstPlayerName;
        $this->_secondPlayerName = $secondPlayerName;
    }

    public function score()
    {
        return $this->isScoreDifferent()
            ? ($this->isReadyForWin() ? $this->advState() : $this->normalScore())
            : ($this->isDeuce() ? $this->deuce() : $this->sameScore());
    }

    /**
     * @return bool
     */
    private function isScoreDifferent(): bool
    {
        return $this->_firstPlayerScoreTimes != $this->_secondPlayerScoreTimes;
    }

    /**
     * @return bool
     */
    private function isReadyForWin(): bool
    {
        return $this->_firstPlayerScoreTimes > 3 || $this->_secondPlayerScoreTimes > 3;
    }

    /**
     * @return string
     */
    private function advState(): string
    {
        return $this->advPlayer() . ($this->isAdv() ? " Adv" : " Win");
    }

    /**
     * @return mixed
     */
    private function advPlayer()
    {
        $advPlayer = $this->_firstPlayerScoreTimes > $this->_secondPlayerScoreTimes ? $this->_firstPlayerName : $this->_secondPlayerName;
        return $advPlayer;
    }

    /**
     * @return bool
     */
    private function isAdv(): bool
    {
        return abs($this->_firstPlayerScoreTimes - $this->_secondPlayerScoreTimes) == 1;
    }

    /**
     * @return string
     */
    private function normalScore(): string
    {
        return $this->lookup[$this->_firstPlayerScoreTimes] . " " . $this->lookup[$this->_secondPlayerScoreTimes];
    }

    /**
     * @return bool
     */
    private function isDeuce(): bool
    {
        return $this->_firstPlayerScoreTimes >= 3;
    }

    /**
     * @return string
     */
    private function deuce(): string
    {
        return "Deuce";
    }

    /**
     * @return string
     */
    private function sameScore(): string
    {
        return $this->lookup[$this->_firstPlayerScoreTimes] . " All";
    }

    public function firstPlayerScore()
    {
        $this->_firstPlayerScoreTimes++;
    }

    public function secondPlayerScore()
    {
        $this->_secondPlayerScoreTimes++;
    }
}

TennisGameTest.php

<?php
/**
 * Created by PhpStorm.
 * User: JoeyChen
 * Date: 2017/12/2
 * Time: 下午 01:25
 */

namespace Tests;


use JoeyDojo\TennisGame;
use PHPUnit\Framework\TestCase;

class TennisGameTest extends TestCase
{
    /**
     * @var TennisGame
     */
    private $tennisGame;


    public function test_score_Love_Fifteen()
    {
        $this->tennisGame->secondPlayerScore();
        $this->scoreShouldBe("Love Fifteen");
    }

    private function scoreShouldBe($expected): void
    {
        $this->assertEquals($expected, $this->tennisGame->score());
    }

    public function test_score_Love_Thirty()
    {
        $this->givenSecondPlayerScoreTimes(2);
        $this->scoreShouldBe("Love Thirty");
    }

    private function givenSecondPlayerScoreTimes($times)
    {
        for ($i = 0; $i < $times; $i++) {
            $this->tennisGame->secondPlayerScore();
        }
    }

    public function test_score_Love_All()
    {
        $this->scoreShouldBe("Love All");
    }

    public function test_score_Fifteen_Love()
    {
        $this->tennisGame->firstPlayerScore();
        $this->scoreShouldBe("Fifteen Love");
    }

    public function test_score_Thirty_Love()
    {
        $this->givenFirstPlayerScoreTimes(2);
        $this->scoreShouldBe("Thirty Love");
    }

    private function givenFirstPlayerScoreTimes($times)
    {
        for ($i = 0; $i < $times; $i++) {
            $this->tennisGame->firstPlayerScore();
        }
    }

    public function test_score_Forty_Love()
    {
        $this->givenFirstPlayerScoreTimes(3);
        $this->scoreShouldBe("Forty Love");
    }

    public function test_score_Fifteen_All()
    {
        $this->tennisGame->firstPlayerScore();
        $this->tennisGame->secondPlayerScore();
        $this->scoreShouldBe("Fifteen All");
    }

    public function test_score_Deuce()
    {
        $this->givenFirstPlayerScoreTimes(3);
        $this->givenSecondPlayerScoreTimes(3);
        $this->scoreShouldBe("Deuce");
    }

    public function test_score_FirstPlayer_Adv()
    {
        $this->givenFirstPlayerScoreTimes(4);
        $this->givenSecondPlayerScoreTimes(3);
        $this->scoreShouldBe("Joey Adv");
    }

    public function test_score_SecondPlayer_Adv()
    {
        $this->givenFirstPlayerScoreTimes(3);
        $this->givenSecondPlayerScoreTimes(4);
        $this->scoreShouldBe("May Adv");
    }

    public function test_score_FirstPlayer_Win()
    {
        $this->givenFirstPlayerScoreTimes(5);
        $this->givenSecondPlayerScoreTimes(3);
        $this->scoreShouldBe("Joey Win");
    }

    public function test_score_SecondPlayer_Win()
    {
        $this->givenFirstPlayerScoreTimes(3);
        $this->givenSecondPlayerScoreTimes(5);
        $this->scoreShouldBe("May Win");
    }

    protected function setUp()
    {
        $this->tennisGame = new TennisGame("Joey", "May");
    }
}