CarRaceTest.java

package racingcar.controller;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import racingcar.model.Car;

import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

class CarRaceTest {

    private CarRace carRace;

    @BeforeEach
    void setUp() {
        carRace = new CarRace();
    }

    @Test
    @DisplayName("자동차 이름을 올바르게 입력받을 경우 carNames 리스트가 초기화된다.")
    void receiveCarNamesInput_shouldParseNamesCorrectly() {
        // given
        List<String> names = List.of("pobi", "woni", "jun");

        // when
        carRace.setCarNames(names);
        carRace.makeCarObjects();

        // then
        try {
            var field = CarRace.class.getDeclaredField("cars");
            field.setAccessible(true);
            List<Car> cars = (List<Car>) field.get(carRace);
            assertEquals(3, cars.size());
            assertEquals("pobi", cars.get(0).getCarName());
        } catch (Exception e) {
            fail("리플렉션 접근 실패: " + e.getMessage());
        }
    }

    @Test
    @DisplayName("자동차 객체를 올바르게 생성해야 한다.")
    void makeCarObjects_shouldCreateCars() {
        carRace = new CarRace();

        var names = List.of("pobi", "woni", "jun");

        try {
            var field = CarRace.class.getDeclaredField("carNames");
            field.setAccessible(true);
            field.set(carRace, names);
        } catch (Exception e) {
            fail("리플렉션 설정 실패: " + e.getMessage());
        }

        // when
        carRace.makeCarObjects();

        // then
        try {
            var field = CarRace.class.getDeclaredField("cars");
            field.setAccessible(true);
            List<Car> cars = (List<Car>) field.get(carRace);
            assertEquals(3, cars.size());
            assertEquals("pobi", cars.get(0).getCarName());
        } catch (Exception e) {
            fail("리플렉션 접근 실패: " + e.getMessage());
        }
    }

    @Test
    @DisplayName("우승자 이름을 올바르게 설정해야 한다.")
    void setWinnerCarNames_shouldFindCorrectWinners() {
        try {
            var names = List.of("a", "b", "c");
            var field = CarRace.class.getDeclaredField("carNames");
            field.setAccessible(true);
            field.set(carRace, names);
            carRace.makeCarObjects();

            // 강제로 position 설정
            var carsField = CarRace.class.getDeclaredField("cars");
            carsField.setAccessible(true);
            List<Car> cars = (List<Car>) carsField.get(carRace);

            // a는 2칸, b는 1칸, c는 0칸
            var posField = Car.class.getDeclaredField("position");
            posField.setAccessible(true);
            posField.setInt(cars.get(0), 2); // a
            posField.setInt(cars.get(1), 1); // b
            posField.setInt(cars.get(2), 0); // c

            // when
            carRace.setWinnerCarNames();

            // then
            var winnerField = CarRace.class.getDeclaredField("winnerCarNames");
            winnerField.setAccessible(true);
            List<String> winners = (List<String>) winnerField.get(carRace);

            assertEquals(List.of("a"), winners);

        } catch (Exception e) {
            fail("테스트 실행 중 오류: " + e.getMessage());
        }
    }
}