test(VolunteerRepository): 봉사 시간 기준 봉사자 조회

- 상위 4명 조회
- 봉사자 없으면 빈 리스트 반환
- 봉사자 4명 미만이면 전체 조회

Author: m-a-king

src/test/java/com/somemore/volunteer/repository/VolunteerRepositoryTest.java

@@ -3,12 +3,14 @@
 import com.somemore.IntegrationTestSupport;
 import com.somemore.auth.oauth.OAuthProvider;
 import com.somemore.volunteer.domain.Volunteer;
+import com.somemore.volunteer.repository.mapper.VolunteerOverviewForRankingByHours;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -76,4 +78,57 @@ void findByOauthId() {
         assertThat(foundVolunteer.get().getOauthId()).isEqualTo(oAuthId);
         assertThat(foundVolunteer.get().getNickname()).isEqualTo(volunteer.getNickname());
     }
+
+    @DisplayName("봉사 시간 기준 상위 4명을 조회한다.")
+    @Test
+    void findRankingByVolunteerHours_top4() {
+        // given
+        for (int i = 1; i <= 5; i++) {
+            createVolunteerAndUpdateVolunteerStats(i);
+        }
+
+        // when
+        List<VolunteerOverviewForRankingByHours> rankings = volunteerRepository.findRankingByVolunteerHours();
+
+        // then
+        assertThat(rankings).hasSize(4);
+        assertThat(rankings.get(0).totalVolunteerHours()).isGreaterThan(rankings.get(1).totalVolunteerHours());
+    }
+
+    @DisplayName("등록된 봉사자가 없는 경우 빈 리스트를 반환한다.")
+    @Test
+    void findRankingByVolunteerHours_noVolunteers() {
+        // given
+        volunteerRepository.deleteAllInBatch();
+
+        // when
+        List<VolunteerOverviewForRankingByHours> rankings = volunteerRepository.findRankingByVolunteerHours();
+
+        // then
+        assertThat(rankings).isEmpty();
+    }
+
+    @DisplayName("등록된 봉사자가 4명 이하인 경우 전체 봉사자를 반환한다.")
+    @Test
+    void findRankingByVolunteerHours_lessThan4Volunteers() {
+        // given
+        volunteerRepository.deleteAllInBatch();
+
+        for (int i = 1; i <= 3; i++) {
+            createVolunteerAndUpdateVolunteerStats(i);
+        }
+
+        // when
+        List<VolunteerOverviewForRankingByHours> rankings = volunteerRepository.findRankingByVolunteerHours();
+
+        // then
+        assertThat(rankings).hasSize(3);
+        assertThat(rankings.get(0).totalVolunteerHours()).isGreaterThan(rankings.get(1).totalVolunteerHours());
+    }
+
+    private void createVolunteerAndUpdateVolunteerStats(int i) {
+        Volunteer volunteer = Volunteer.createDefault(OAuthProvider.NAVER, "oauth-id-" + i);
+        volunteer.updateVolunteerStats(i * 10, i);
+        volunteerRepository.save(volunteer);
+    }
 }