feat: 유저의 멘토 지원서 신청 이력 조회 기능 추가

src/main/java/com/example/solidconnection/admin/controller/AdminMentorApplicationController.java

@@ -2,12 +2,14 @@
 
 import com.example.solidconnection.admin.dto.MentorApplicationAssignUniversityRequest;
 import com.example.solidconnection.admin.dto.MentorApplicationCountResponse;
+import com.example.solidconnection.admin.dto.MentorApplicationHistoryResponse;
 import com.example.solidconnection.admin.dto.MentorApplicationRejectRequest;
 import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
 import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
 import com.example.solidconnection.admin.service.AdminMentorApplicationService;
 import com.example.solidconnection.common.response.PageResponse;
 import jakarta.validation.Valid;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.data.domain.Page;
@@ -73,4 +75,12 @@ public ResponseEntity<Void> assignUniversity(
         adminMentorApplicationService.assignUniversity(mentorApplicationId, universityId);
         return ResponseEntity.ok().build();
     }
+
+    @GetMapping("/{site-user-id}/mentor-application-history")
+    public ResponseEntity<List<MentorApplicationHistoryResponse>> getMentorApplicationHistory(
+            @PathVariable("site-user-id") Long siteUserId
+    ){
+        List<MentorApplicationHistoryResponse> response = adminMentorApplicationService.findMentorApplicationHistory(siteUserId);
+        return ResponseEntity.ok(response);
+    }
 }

src/main/java/com/example/solidconnection/admin/dto/MentorApplicationHistoryResponse.java

@@ -0,0 +1,14 @@
+package com.example.solidconnection.admin.dto;
+
+import com.example.solidconnection.mentor.domain.MentorApplicationStatus;
+import java.time.ZonedDateTime;
+
+public record MentorApplicationHistoryResponse(
+        long id,
+        MentorApplicationStatus mentorApplicationStatus,
+        String rejectedReason,
+        ZonedDateTime createdAt,
+        int applicationOrder
+) {
+
+}

src/main/java/com/example/solidconnection/admin/service/AdminMentorApplicationService.java

@@ -1,17 +1,23 @@
 package com.example.solidconnection.admin.service;
 
 import static com.example.solidconnection.common.exception.ErrorCode.MENTOR_APPLICATION_NOT_FOUND;
+import static com.example.solidconnection.common.exception.ErrorCode.USER_NOT_FOUND;
 
 import com.example.solidconnection.admin.dto.MentorApplicationCountResponse;
+import com.example.solidconnection.admin.dto.MentorApplicationHistoryResponse;
 import com.example.solidconnection.admin.dto.MentorApplicationRejectRequest;
 import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
 import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
 import com.example.solidconnection.common.exception.CustomException;
 import com.example.solidconnection.mentor.domain.MentorApplication;
 import com.example.solidconnection.mentor.domain.MentorApplicationStatus;
 import com.example.solidconnection.mentor.repository.MentorApplicationRepository;
+import com.example.solidconnection.siteuser.domain.SiteUser;
+import com.example.solidconnection.siteuser.repository.SiteUserRepository;
 import com.example.solidconnection.university.domain.University;
 import com.example.solidconnection.university.repository.UniversityRepository;
+import java.util.List;
+import java.util.stream.IntStream;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -24,6 +30,7 @@ public class AdminMentorApplicationService {
 
     private final MentorApplicationRepository mentorApplicationRepository;
     private final UniversityRepository universityRepository;
+    private final SiteUserRepository siteUserRepository;
 
     @Transactional(readOnly = true)
     public Page<MentorApplicationSearchResponse> searchMentorApplications(
@@ -43,7 +50,7 @@ public void approveMentorApplication(Long mentorApplicationId) {
 
     @Transactional
     public void rejectMentorApplication(
-            long mentorApplicationId,
+            Long mentorApplicationId,
             MentorApplicationRejectRequest request
     ) {
         MentorApplication mentorApplication = mentorApplicationRepository.findById(mentorApplicationId)
@@ -79,4 +86,26 @@ public void assignUniversity(
 
         mentorApplication.assignUniversity(university.getId());
     }
+
+    @Transactional(readOnly = true)
+    public List<MentorApplicationHistoryResponse> findMentorApplicationHistory(Long siteUserId) {
+        SiteUser siteUser = siteUserRepository.findById(siteUserId)
+                .orElseThrow(() -> new CustomException(USER_NOT_FOUND));
+
+        long totalCount = mentorApplicationRepository.countBySiteUserId(siteUserId);
+
+        List<MentorApplication> mentorApplications = mentorApplicationRepository.findTop5BySiteUserIdOrderByCreatedAtDesc(siteUser.getId());
+
+        return IntStream.range(0, mentorApplications.size())
+                .mapToObj(index -> {
+                    MentorApplication app = mentorApplications.get(index);
+                    return new MentorApplicationHistoryResponse(
+                            app.getId(),
+                            app.getMentorApplicationStatus(),
+                            app.getRejectedReason(),
+                            app.getCreatedAt(),
+                            (int) totalCount - index
+                    );
+                }).toList();
+    }
 }

src/main/java/com/example/solidconnection/mentor/repository/MentorApplicationRepository.java

@@ -14,4 +14,8 @@ public interface MentorApplicationRepository extends JpaRepository<MentorApplica
     Optional<MentorApplication> findBySiteUserIdAndMentorApplicationStatus(long siteUserId, MentorApplicationStatus mentorApplicationStatus);
 
     long countByMentorApplicationStatus(MentorApplicationStatus mentorApplicationStatus);
+
+    List<MentorApplication> findTop5BySiteUserIdOrderByCreatedAtDesc(long siteUserId);
+
+    long countBySiteUserId(long siteUserId);
 }

src/test/java/com/example/solidconnection/admin/service/AdminMentorApplicationServiceTest.java

@@ -5,11 +5,13 @@
 import static com.example.solidconnection.common.exception.ErrorCode.MENTOR_APPLICATION_NOT_OTHER_STATUS;
 import static com.example.solidconnection.common.exception.ErrorCode.MENTOR_APPLICATION_UNIVERSITY_NOT_SELECTED;
 import static com.example.solidconnection.common.exception.ErrorCode.UNIVERSITY_NOT_FOUND;
+import static com.example.solidconnection.common.exception.ErrorCode.USER_NOT_FOUND;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.AssertionsForClassTypes.assertThatCode;
 import static org.junit.jupiter.api.Assertions.assertAll;
 
 import com.example.solidconnection.admin.dto.MentorApplicationCountResponse;
+import com.example.solidconnection.admin.dto.MentorApplicationHistoryResponse;
 import com.example.solidconnection.admin.dto.MentorApplicationRejectRequest;
 import com.example.solidconnection.admin.dto.MentorApplicationSearchCondition;
 import com.example.solidconnection.admin.dto.MentorApplicationSearchResponse;
@@ -509,4 +511,106 @@ class 멘토_지원서에_대학_매핑 {
                     .hasMessage(UNIVERSITY_NOT_FOUND.getMessage());
         }
     }
+
+    @Nested
+    class 멘토_지원서_이력_조회 {
+
+        @Test
+        void 사용자의_멘토_지원서_이력을_최신_생성_내림차순으로_조회한다() {
+            // given
+            SiteUser user = siteUserFixture.사용자();
+            University university = universityFixture.메이지_대학();
+            MentorApplication app1 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app2 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app3 = mentorApplicationFixture.승인된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+
+            // when
+            List<MentorApplicationHistoryResponse> response = adminMentorApplicationService.findMentorApplicationHistory(user.getId());
+
+            // then
+            assertAll(
+                    () -> assertThat(response).hasSize(3),
+                    () -> assertThat(response)
+                            .extracting(MentorApplicationHistoryResponse::id)
+                            .containsExactly(app3.getId(), app2.getId(), app1.getId()),
+                    () -> assertThat(response)
+                            .extracting(MentorApplicationHistoryResponse::applicationOrder)
+                            .containsExactly(3,2,1)
+            );
+        }
+
+        @Test
+        void 지원서가_5개를_초과하면_최신_5개만_최신_생성_내림차순으로_조회한다() {
+            // given
+            SiteUser user = siteUserFixture.사용자();
+            University university = universityFixture.메이지_대학();
+            MentorApplication app1 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app2 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app3 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app4 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app5 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app6 = mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            MentorApplication app7 = mentorApplicationFixture.승인된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+
+            // when
+            List<MentorApplicationHistoryResponse> response = adminMentorApplicationService.findMentorApplicationHistory(user.getId());
+
+            // then
+            assertAll(
+                    () -> assertThat(response).hasSize(5),
+                    () -> assertThat(response)
+                            .extracting(MentorApplicationHistoryResponse::id)
+                            .containsExactly(app7.getId(), app6.getId(), app5.getId(), app4.getId(), app3.getId()),
+                    () -> assertThat(response)
+                            .extracting(MentorApplicationHistoryResponse::applicationOrder)
+                            .containsExactly(7,6,5,4,3)
+            );
+        }
+
+        @Test
+        void 지원서_이력이_없으면_빈_목록을_반환한다() {
+            // given
+            SiteUser user = siteUserFixture.사용자();
+
+            // when
+            List<MentorApplicationHistoryResponse> response = adminMentorApplicationService.findMentorApplicationHistory(user.getId());
+
+            // then
+            assertThat(response).isEmpty();
+        }
+
+        @Test
+        void 응답에_지원서_상태와_거절_사유가_포함된다() {
+            // given
+            SiteUser user = siteUserFixture.사용자();
+            University university = universityFixture.메이지_대학();
+            mentorApplicationFixture.거절된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+            mentorApplicationFixture.승인된_멘토신청(user.getId(), UniversitySelectType.CATALOG, university.getId());
+
+            // when
+            List<MentorApplicationHistoryResponse> response = adminMentorApplicationService.findMentorApplicationHistory(user.getId());
+
+            // then
+            assertAll(
+                    () -> assertThat(response).hasSize(2),
+                    () -> assertThat(response.get(0).mentorApplicationStatus()).isEqualTo(MentorApplicationStatus.APPROVED),
+                    () -> assertThat(response.get(0).rejectedReason()).isNull(),
+                    () -> assertThat(response.get(0).applicationOrder()).isEqualTo(2),
+                    () -> assertThat(response.get(1).mentorApplicationStatus()).isEqualTo(MentorApplicationStatus.REJECTED),
+                    () -> assertThat(response.get(1).rejectedReason()).isNotNull(),
+                    () -> assertThat(response.get(1).applicationOrder()).isEqualTo(1)
+            );
+        }
+
+        @Test
+        void 존재하지_않는_사용자_이력을_조회하면_예외_응답을_반환한다() {
+            // given
+            long nonExistentUserId = 99999L;
+
+            // when & then
+            assertThatCode(() -> adminMentorApplicationService.findMentorApplicationHistory(nonExistentUserId))
+                    .isInstanceOf(CustomException.class)
+                    .hasMessage(USER_NOT_FOUND.getMessage());
+        }
+    }
 }

src/test/java/com/example/solidconnection/mentor/fixture/MentorApplicationFixture.java

@@ -18,6 +18,7 @@ public class MentorApplicationFixture {
     private static final String DEFAULT_COUNTRY_CODE = "US";
     private static final String DEFAULT_PROOF_URL   = "/mentor-proof.pdf";
     private static final ExchangeStatus DEFAULT_EXCHANGE_STATUS = ExchangeStatus.AFTER_EXCHANGE;
+    private static final String REJECTED_REASON = "pdf 파일 안열림";
 
     public MentorApplication 대기중_멘토신청(
             long siteUserId,
@@ -64,6 +65,7 @@ public class MentorApplicationFixture {
                 .universitySelectType(selectType)
                 .mentorProofUrl(DEFAULT_PROOF_URL)
                 .termId(termFixture.현재_학기("2025-1").getId())
+                .rejectedReason(REJECTED_REASON)
                 .exchangeStatus(DEFAULT_EXCHANGE_STATUS)
                 .mentorApplicationStatus(MentorApplicationStatus.REJECTED)
                 .create();

src/test/java/com/example/solidconnection/mentor/fixture/MentorApplicationFixtureBuilder.java

@@ -21,6 +21,7 @@ public class MentorApplicationFixtureBuilder {
     private UniversitySelectType universitySelectType = UniversitySelectType.OTHER;
     private String mentorProofUrl = "/mentor-proof.pdf";
     private long termId;
+    private String rejectedReason = null;
     private ExchangeStatus exchangeStatus = ExchangeStatus.AFTER_EXCHANGE;
     private MentorApplicationStatus mentorApplicationStatus = MentorApplicationStatus.PENDING;
 
@@ -58,6 +59,11 @@ public MentorApplicationFixtureBuilder termId(long termId) {
         return this;
     }
 
+    public MentorApplicationFixtureBuilder rejectedReason(String rejectedReason) {
+        this.rejectedReason = rejectedReason;
+        return this;
+    }
+
     public MentorApplicationFixtureBuilder exchangeStatus(ExchangeStatus exchangeStatus) {
         this.exchangeStatus = exchangeStatus;
         return this;
@@ -79,6 +85,9 @@ public MentorApplication create() {
                 exchangeStatus
         );
         ReflectionTestUtils.setField(mentorApplication, "mentorApplicationStatus", mentorApplicationStatus);
+        if(rejectedReason != null) {
+            ReflectionTestUtils.setField(mentorApplication, "rejectedReason", rejectedReason);
+        }
         return mentorApplicationRepository.save(mentorApplication);
     }
 }