test: LikeSyncScheduler 테스트 추가

backend/src/test/java/hanglog/like/service/LikeSyncSchedulerTest.java

@@ -0,0 +1,64 @@
+package hanglog.like.service;
+
+import static hanglog.integration.IntegrationFixture.TRIP_CREATE_REQUEST;
+import static org.assertj.core.api.SoftAssertions.assertSoftly;
+
+import hanglog.integration.service.RedisServiceIntegrationTest;
+import hanglog.like.domain.Likes;
+import hanglog.like.domain.repository.LikeRepository;
+import hanglog.like.dto.request.LikeRequest;
+import hanglog.trip.service.TripService;
+import java.util.List;
+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;
+
+class LikeSyncSchedulerTest extends RedisServiceIntegrationTest {
+
+    @Autowired
+    private LikeSyncScheduler likeSyncScheduler;
+
+    @Autowired
+    private LikeRepository likeRepository;
+
+    @Autowired
+    private TripService tripService;
+
+    @Autowired
+    private LikeService likeService;
+
+    private Long memberId;
+    private Long tripId1;
+    private Long tripId2;
+
+    @BeforeEach
+    void setUp() {
+        memberId = member.getId();
+        tripId1 = tripService.save(memberId, TRIP_CREATE_REQUEST);
+        tripId2 = tripService.save(memberId, TRIP_CREATE_REQUEST);
+    }
+
+    @DisplayName("Redis에서 업데이트 된 좋아요 값을 DB에 저장한다. (기존에 저장되어 있는 TripId 1 삭제하고 TripId 2 데이터만 남는다.)")
+    @Test
+    void writeBackLikeCache() {
+        // given
+        final Likes likeTripId1 = new Likes(tripId1, memberId);
+        likeRepository.save(likeTripId1);
+
+        likeService.update(memberId, tripId1, new LikeRequest(false));
+        likeService.update(memberId, tripId2, new LikeRequest(true));
+
+        // when
+        likeSyncScheduler.writeBackLikeCache();
+        final List<Likes> likes = likeRepository.findAll();
+
+        // then
+        assertSoftly(softly -> {
+            softly.assertThat(likes.size()).isEqualTo(1);
+            softly.assertThat(likes.get(0)).usingRecursiveComparison()
+                    .ignoringFields("id")
+                    .isEqualTo(new Likes(tripId2, memberId));
+        });
+    }
+}