[BE] feat: 섹션 이름 조회 API 구현

backend/src/main/java/reviewme/template/service/SectionService.java

@@ -1,16 +1,33 @@
 package reviewme.template.service;
 
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
+import reviewme.review.service.exception.ReviewGroupNotFoundByReviewRequestCodeException;
+import reviewme.reviewgroup.domain.ReviewGroup;
+import reviewme.reviewgroup.repository.ReviewGroupRepository;
+import reviewme.template.repository.SectionRepository;
+import reviewme.template.service.dto.response.SectionNameResponse;
 import reviewme.template.service.dto.response.SectionNamesResponse;
 
 @Service
 @RequiredArgsConstructor
 public class SectionService {
 
+    private final ReviewGroupRepository reviewGroupRepository;
+    private final SectionRepository sectionRepository;
+
     @Transactional(readOnly = true)
     public SectionNamesResponse getSectionNames(String reviewRequestCode) {
-        return null;
+        ReviewGroup reviewGroup = reviewGroupRepository.findByReviewRequestCode(reviewRequestCode)
+                .orElseThrow(() -> new ReviewGroupNotFoundByReviewRequestCodeException(reviewRequestCode));
+
+        List<SectionNameResponse> sectionNameResponses = sectionRepository.findAllByTemplateId(reviewGroup.getTemplateId())
+                .stream()
+                .map(section -> new SectionNameResponse(section.getId(), section.getSectionName()))
+                .toList();
+
+        return new SectionNamesResponse(sectionNameResponses);
     }
 }

backend/src/test/java/reviewme/template/service/SectionServiceTest.java

@@ -0,0 +1,73 @@
+package reviewme.template.service;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static reviewme.fixture.ReviewGroupFixture.리뷰_그룹;
+import static reviewme.fixture.TemplateFixture.템플릿;
+
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import reviewme.review.service.exception.ReviewGroupNotFoundByReviewRequestCodeException;
+import reviewme.reviewgroup.domain.ReviewGroup;
+import reviewme.reviewgroup.repository.ReviewGroupRepository;
+import reviewme.support.ServiceTest;
+import reviewme.template.domain.Section;
+import reviewme.template.domain.VisibleType;
+import reviewme.template.repository.SectionRepository;
+import reviewme.template.repository.TemplateRepository;
+import reviewme.template.service.dto.response.SectionNameResponse;
+import reviewme.template.service.dto.response.SectionNamesResponse;
+
+@ServiceTest
+class SectionServiceTest {
+
+    @Autowired
+    private SectionService sectionService;
+
+    @Autowired
+    private ReviewGroupRepository reviewGroupRepository;
+
+    @Autowired
+    private TemplateRepository templateRepository;
+
+    @Autowired
+    private SectionRepository sectionRepository;
+
+    @Test
+    void 템플릿에_있는_섹션_이름_목록을_응답한다() {
+        // given
+        String sectionName1 = "섹션1";
+        String sectionName2 = "섹션2";
+        String sectionName3 = "섹션3";
+
+        Section visibleSection1 = sectionRepository.save(
+                new Section(VisibleType.ALWAYS, List.of(1L), null, sectionName1, "헤더", 1));
+        Section visibleSection2 = sectionRepository.save(
+                new Section(VisibleType.ALWAYS, List.of(2L), null, sectionName2, "헤더", 2));
+        Section nonVisibleSection = sectionRepository.save(
+                new Section(VisibleType.CONDITIONAL, List.of(1L), 1L, sectionName3, "헤더", 3));
+        templateRepository.save(
+                템플릿(List.of(nonVisibleSection.getId(), visibleSection2.getId(), visibleSection1.getId())));
+
+        ReviewGroup reviewGroup = reviewGroupRepository.save(리뷰_그룹());
+
+        // when
+        SectionNamesResponse actual = sectionService.getSectionNames(reviewGroup.getReviewRequestCode());
+
+        // then
+        assertThat(actual.sections()).extracting(SectionNameResponse::name)
+                .containsExactly(sectionName1, sectionName2, sectionName3);
+    }
+
+    @Test
+    void 템플릿에_있는_섹션_이름_목록_조회시_리뷰_요청_코드가_존재하지_않는_경우_예외가_발생한다() {
+        // given
+        ReviewGroup reviewGroup = reviewGroupRepository.save(리뷰_그룹());
+
+        // when, then
+        assertThatThrownBy(() -> sectionService.getSectionNames(
+                reviewGroup.getReviewRequestCode() + "wrong"))
+                .isInstanceOf(ReviewGroupNotFoundByReviewRequestCodeException.class);
+    }
+}