[BE] refactor: MockData 설정 로직 리팩터링 및 테스트 속도 개선 (#839) (#860)

* fix: 중복으로 실행되는 Mock Data 설정 수정

- MockScheduler initialDelay 추가
- CommandLineAppStartupRunner MockScheduler 의존 제거

* refactor: Mock 아티스트, 학교 생성 로직 분리

* test: 테스트 코드 개선

- 일부 테스트 로직 간결하게 변경
- 트랜잭션 제거

* feat: 도메인 엔티티를 반환하는 MockGenerator 구현

* refactor: Mock 생성 로직 MockGenerator를 사용하도록 리팩터링

* refactor: 패키지 위치 정리, MockDataServiceIntegrationTest 검증 로직 정리

* refactor: 사용하지 않는 클래스 제거

* refactor: 어플리케이션 실행마다 축제 생성 방지

* refactor: 클래스, 메서드 명 명확하게 변경

* fix: 스케줄러 TimeUnit 수정

* feat: MockDataStartupInitializer 트랜잭션 적용하여 원자성 보장

* chore: 메서드명 수정

* chore: 학교 이름 뒤 추가하는 인덱스 제거

* refactor: 축제 생성 시 이름 "테코대학교 20770630 축제" 와 같은 포맷으로 변경

* test: given-when-then 잘못된 위치 수정

* chore: MockStageArtistsGenerator Javadoc 추가

* feat: MockFestivalDurationGenerator 추가

* refactor: 비즈니스 로직에 사용되는 변수 도메인으로 이동 및 MockFestivalDurationGenerator 사용하도록 변경

* feat: StageArtist notNull 검증 추가

- stageId, artistId

backend/src/main/java/com/festago/festival/domain/FestivalDuration.java

@@ -0,0 +1,47 @@
+package com.festago.festival.domain;
+
+import com.festago.common.exception.BadRequestException;
+import com.festago.common.exception.ErrorCode;
+import com.festago.common.util.Validator;
+import jakarta.persistence.Embeddable;
+import java.time.LocalDate;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@Embeddable
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class FestivalDuration {
+
+    private LocalDate startDate;
+    private LocalDate endDate;
+
+    public FestivalDuration(LocalDate startDate, LocalDate endDate) {
+        validate(startDate, endDate);
+        this.startDate = startDate;
+        this.endDate = endDate;
+    }
+
+    private void validate(LocalDate startDate, LocalDate endDate) {
+        Validator.notNull(startDate, "startDate");
+        Validator.notNull(endDate, "endDate");
+        if (startDate.isAfter(endDate)) {
+            throw new BadRequestException(ErrorCode.INVALID_FESTIVAL_DURATION);
+        }
+    }
+
+    public boolean isBeforeStartDate(LocalDate date) {
+        return startDate.isBefore(date);
+    }
+
+    public boolean isNotInDuration(LocalDate date) {
+        return date.isBefore(startDate) || date.isAfter(endDate);
+    }
+
+    public LocalDate getStartDate() {
+        return startDate;
+    }
+
+    public LocalDate getEndDate() {
+        return endDate;
+    }
+}

backend/src/main/java/com/festago/mock/MockScheduler.java → backend/src/main/java/com/festago/mock/MockDataInitialScheduler.java

@@ -1,21 +1,22 @@
 package com.festago.mock;
 
+import com.festago.mock.application.MockDataService;
 import java.util.concurrent.TimeUnit;
 import lombok.RequiredArgsConstructor;
 import org.springframework.context.annotation.Profile;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
-@Profile("dev")
+@Profile({"dev"})
 @Component
 @RequiredArgsConstructor
-public class MockScheduler {
+public class MockDataInitialScheduler {
 
-    private static final long SCHEDULER_CYCLE = 7;
+    private static final long DAYS_OF_WEEK = 7L;
     private final MockDataService mockDataService;
 
-    @Scheduled(fixedDelay = SCHEDULER_CYCLE, timeUnit = TimeUnit.DAYS)
-    public void run() {
-        mockDataService.makeMockFestivals((int) SCHEDULER_CYCLE);
+    @Scheduled(initialDelay = DAYS_OF_WEEK, fixedDelay = DAYS_OF_WEEK, timeUnit = TimeUnit.DAYS)
+    public void createMockFestivals() {
+        mockDataService.makeMockFestivals();
     }
 }

backend/src/main/java/com/festago/mock/MockDataStartupInitializer.java

@@ -0,0 +1,29 @@
+package com.festago.mock;
+
+import com.festago.mock.application.MockDataService;
+import com.festago.mock.repository.ForMockSchoolRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.annotation.Profile;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+@Profile({"dev"})
+@Component
+@RequiredArgsConstructor
+public class MockDataStartupInitializer {
+
+    private final ForMockSchoolRepository forMockSchoolRepository;
+    private final MockDataService mockDataService;
+
+    @Transactional
+    @EventListener(ApplicationReadyEvent.class)
+    public void initialize() {
+        if (forMockSchoolRepository.count() == 0) {
+            mockDataService.makeMockArtists();
+            mockDataService.makeMockSchools();
+            mockDataService.makeMockFestivals();
+        }
+    }
+}