fix: setId 테스트 로직 추가

Author: uwoobeat

src/test/java/com/gdschongik/gdsc/domain/study/domain/StudyHistoryTest.java

@@ -69,6 +69,7 @@ class 스터디_수료_철회시 {
                     mentor, Period.of(now.plusDays(5), now.plusDays(10)), Period.of(now.minusDays(5), now));
 
             StudyHistory studyHistory = StudyHistory.create(student, study);
+            fixtureHelper.setId(studyHistory, 1L); // TODO: 이벤트 ID 필드를 원시 타입으로 설정하는 것 vs setId를 테스트 사용 강제 간 trade-off 고민
             studyHistory.complete();
 
             // when

src/test/java/com/gdschongik/gdsc/helper/FixtureHelper.java

@@ -8,6 +8,7 @@
 import static com.gdschongik.gdsc.global.common.constant.StudyConstant.*;
 import static com.gdschongik.gdsc.global.common.constant.TemporalConstant.*;
 
+import com.gdschongik.gdsc.domain.common.model.BaseEntity;
 import com.gdschongik.gdsc.domain.common.model.SemesterType;
 import com.gdschongik.gdsc.domain.common.vo.Money;
 import com.gdschongik.gdsc.domain.common.vo.Period;
@@ -25,6 +26,11 @@
 
 public class FixtureHelper {
 
+    public <T extends BaseEntity> T setId(T entity, Long id) {
+        ReflectionTestUtils.setField(entity, "id", id);
+        return entity;
+    }
+
     public Member createGuestMember(Long id) {
         Member member = Member.createGuest(OAUTH_ID);
         ReflectionTestUtils.setField(member, "id", id);