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smileeeeysmileeeey
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step3) 자동차 경주 게임 구현
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‎README.md

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# 자동차 경주 게임
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## 기능 목록
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* 게임 참가자의 이름을 입력받는다. 이름의 구분자는 쉼표(,)이고, 이름이 5자가 넘어가면 NameLengthExceededException을 발생시키고 이름을 다시 입력받도록 한다.
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* 자동차별로 random값을 만들고, 그 숫자가 4 이상이면 전진한다.
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* 전진칸수가 최대값인 자동차가 우승자이다. 공동우승이 가능하다.
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## 진행 방법
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* 자동차 경주 게임 요구사항을 파악한다.
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* 요구사항에 대한 구현을 완료한 후 자신의 github 아이디에 해당하는 브랜치에 Pull Request(이하 PR)를 통해 코드 리뷰 요청을 한다.

‎build.gradle

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dependencies {
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testImplementation 'org.assertj:assertj-core:3.22.0'
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testImplementation 'org.junit.jupiter:junit-jupiter:5.8.2'
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testImplementation 'org.mockito:mockito-core:4.8.1'
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}
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java {

‎src/main/java/exception/NameLengthExceededException.java

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package exception;
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public class NameLengthExceededException extends RuntimeException {
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public NameLengthExceededException(String message) {
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super(message);
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}
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}

‎src/main/java/racingCar/CarRacingGame.java

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package racingCar;
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import exception.NameLengthExceededException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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public class CarRacingGame {
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private final InputView inputView;
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private final ResultView resultView;
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public CarRacingGame(InputView inputView, ResultView resultView) {
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this.inputView = inputView;
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this.resultView = resultView;
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}
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public static void main(String[] args) {
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InputView inputView = new InputView();
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ResultView resultView = new ResultView();
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CarRacingGame game = new CarRacingGame(inputView, resultView);
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game.startGame();
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}
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void startGame() {
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RacingCar[] cars = getParticipant();
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play(cars, inputView.requestPlayCount());
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findWinners(cars);
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}
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RacingCar[] getParticipant() {
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while (true) {
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String names = inputView.requestParticipant();
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try {
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validateNames(names);
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return createRacingCars(names);
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} catch (NameLengthExceededException e) {
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System.out.println(e.getMessage());
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}
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}
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}
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void validateNames(String names) {
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boolean isValid = Arrays.stream(names.split(","))
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.allMatch(name -> name.length() <= 5);
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if (!isValid) {
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throw new NameLengthExceededException("이름이 5글자를 초과할 수 없습니다. 다시 입력해주세요.");
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}
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}
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RacingCar[] createRacingCars(String names) {
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return Arrays.stream(names.split(","))
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.map(name -> new RacingCar(name, 0))
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.toArray(RacingCar[]::new);
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}
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void play(RacingCar[] cars, int count) {
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resultView.printResultTitle();
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for (int i=0 ; i<count ; i++) {
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moveCar(cars);
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resultView.printPlay(cars);
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}
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}
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void moveCar(RacingCar[] cars) {
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for (RacingCar car : cars) {
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car.progress();
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}
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}
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List<String> findWinners(RacingCar[] cars) {
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List<String> winnerList = new ArrayList<>();
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int maxPos = 0;
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for (RacingCar car : cars) {
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int currentPos = car.getPos();
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if (currentPos > maxPos) {
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maxPos = currentPos;
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winnerList.clear();
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winnerList.add(car.getName());
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} else if (currentPos == maxPos) {
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winnerList.add(car.getName());
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}
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}
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resultView.printWinner(winnerList);
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return winnerList;
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}
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}

‎src/main/java/racingCar/InputView.java

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package racingCar;
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import java.util.Scanner;
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public class InputView {
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private static Scanner scanner = new Scanner(System.in);
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String requestParticipant() {
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System.out.println("경주할 자동차 이름을 입력하세요(이름은 쉼표(,)를 기준으로 구분).");
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return scanner.nextLine();
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}
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int requestPlayCount() {
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System.out.println("시도할 회수는 몇회인가요?");
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return Integer.parseInt(scanner.nextLine());
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}
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}

‎src/main/java/racingCar/RacingCar.java

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package racingCar;
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import java.util.Random;
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public class RacingCar {
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private String name;
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private int pos;
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public RacingCar(String name, int pos) {
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this.name = name;
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this.pos = pos;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getPos() {
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return pos;
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}
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public void setPos(int pos) {
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this.pos = pos;
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}
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@Override
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public String toString() {
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return "RacingCar{" + "name='" + name + '\'' + ", pos=" + pos + '}';
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}
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protected int makeRandomNum() {
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return new Random().nextInt(10);
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}
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void progress() {
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if (makeRandomNum() >= 4){
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incPos();
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}
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}
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protected void incPos() {
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++this.pos;
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}
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}

‎src/main/java/racingCar/ResultView.java

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package racingCar;
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import java.util.List;
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public class ResultView {
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void printResultTitle() {
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System.out.println("실행 결과");
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}
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void printPlay(RacingCar[] cars) {
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for (RacingCar car : cars) {
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System.out.println(car.getName() + " : " + "-".repeat(car.getPos()));
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}
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System.out.println();
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}
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void printWinner(List<String> winner) {
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String winnerMessage = String.join(", ", winner) + "가 최종 우승했습니다.";
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System.out.println(winnerMessage);
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}
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}

‎src/test/java/racingCar/CarRacingGameTest.java

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package racingCar;
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import exception.NameLengthExceededException;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import java.util.Arrays;
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import java.util.List;
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import static org.junit.jupiter.api.Assertions.*;
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import static org.mockito.Mockito.mock;
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class CarRacingGameTest {
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private CarRacingGame carRacingGame;
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private RacingCar[] cars;
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@BeforeEach
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void setUp() {
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InputView mockInputView = mock(InputView.class);
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ResultView mockResultView = mock(ResultView.class);
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carRacingGame = new CarRacingGame(mockInputView, mockResultView);
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cars = new RacingCar[]{
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new RacingCar("apple", 0),
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new RacingCar("cloud", 0),
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new RacingCar("bori", 0)
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};
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}
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@Test
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void testValidateNames_validNames() {
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String names = "apple,cloud,bori";
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assertDoesNotThrow(() -> carRacingGame.validateNames(names));
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}
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@Test
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void testValidateNames_invalidNames() {
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String names = "apple,cloud,longname";
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assertThrows(NameLengthExceededException.class, () -> carRacingGame.validateNames(names));
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}
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@Test
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void testCreateRacingCars() {
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String names = "apple,cloud,bori";
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RacingCar[] createdCars = carRacingGame.createRacingCars(names);
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assertEquals(3, createdCars.length);
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assertArrayEquals(new String[]{"apple", "cloud", "bori"},
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Arrays.stream(createdCars).map(RacingCar::getName).toArray());
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}
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@Test
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void testFindWinners_singleWinner() {
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cars = new RacingCar[]{
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new RacingCar("apple", 1),
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new RacingCar("cloud", 3),
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new RacingCar("bori", 2)
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};
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List<String> winners = carRacingGame.findWinners(cars);
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assertEquals(1, winners.size());
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assertTrue(winners.contains(cars[1].getName()));
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}
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@Test
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void testFindWinners_multipleWinners() {
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cars = new RacingCar[]{
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new RacingCar("apple", 1),
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new RacingCar("cloud", 2),
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new RacingCar("bori", 2)
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};
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List<String> winners = carRacingGame.findWinners(cars);
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assertEquals(2, winners.size());
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assertTrue(winners.contains(cars[1].getName()) && winners.contains(cars[2].getName()));
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}
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}

‎src/test/java/racingCar/RacingCarTest.java

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package racingCar;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import static org.mockito.Mockito.when;
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class RacingCarTest {
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private RacingCar car;
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@BeforeEach
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void setUp() {
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car = new RacingCar("apple", 0);
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}
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@Test
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void makeRandomNum() {
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int random = car.makeRandomNum();
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assertTrue(random >= 0 && random <= 9);
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}
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@Test
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void progress() {
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// given
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when(car.makeRandomNum()).thenReturn(4);
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int expected = car.getPos()+1;
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// when
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car.progress();
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// then
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assertEquals(expected, car.getPos());
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}
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}

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