feat(home): 인기 커뮤니티 점수 정책을 변경한다

src/test/kotlin/kr/co/vividnext/sodalive/v2/recommendation/domain/RecommendationScorePolicyTest.kt

@@ -115,17 +115,36 @@ class RecommendationScorePolicyTest {
     @DisplayName("인기 커뮤니티 점수는 좋아요 수, 댓글 수, 팔로우 수에 가중치를 적용한다")
     fun shouldCalculateCommunityScore() {
         assertEquals(0.5, RecommendationScoreSpec.COMMUNITY_LIKE_WEIGHT, 0.0001)
-        assertEquals(0.5, RecommendationScoreSpec.COMMUNITY_COMMENT_WEIGHT, 0.0001)
+        assertEquals(0.4, RecommendationScoreSpec.COMMUNITY_COMMENT_WEIGHT, 0.0001)
         assertEquals(0.1, RecommendationScoreSpec.COMMUNITY_FOLLOWER_WEIGHT, 0.0001)
 
-        val score = policy.calculateCommunityScore(
-            likeCount = 40,
-            commentCount = 20,
-            followerCount = 100,
-            newBoost = 1.2
-        )
+        assertEquals(0.0, policy.calculateCommunityScore(0, 0, 0, 1.0), 0.0001)
+        assertEquals(5.0, policy.calculateCommunityScore(10, 0, 0, 1.0), 0.0001)
+        assertEquals(4.0, policy.calculateCommunityScore(0, 10, 0, 1.0), 0.0001)
+        assertEquals(1.0, policy.calculateCommunityScore(0, 0, 10, 1.0), 0.0001)
+        assertEquals(38.0, policy.calculateCommunityScore(40, 20, 100, 1.0), 0.0001)
+        assertEquals(43.7, policy.calculateCommunityScore(40, 20, 100, 1.15), 0.0001)
+    }
 
-        assertEquals(48.0, score, 0.0001)
+    @Test
+    @DisplayName("인기 커뮤니티 신규 부스트는 데뷔일 기준 10일/20일/30일 구간을 적용한다")
+    fun shouldApplyCommunityCreatorNewBoostByDebutDays() {
+        val now = LocalDateTime.of(2026, 5, 30, 12, 0)
+
+        assertEquals(1.15, RecommendationScoreSpec.COMMUNITY_NEW_BOOST_10_DAYS, 0.0001)
+        assertEquals(1.10, RecommendationScoreSpec.COMMUNITY_NEW_BOOST_20_DAYS, 0.0001)
+        assertEquals(1.05, RecommendationScoreSpec.COMMUNITY_NEW_BOOST_30_DAYS, 0.0001)
+        assertEquals(1.15, policy.calculateCommunityCreatorNewBoost(now, now), 0.0001)
+        assertEquals(1.15, policy.calculateCommunityCreatorNewBoost(now.minusDays(10), now), 0.0001)
+        assertEquals(1.10, policy.calculateCommunityCreatorNewBoost(now.minusDays(11), now), 0.0001)
+        assertEquals(1.10, policy.calculateCommunityCreatorNewBoost(now.minusDays(20), now), 0.0001)
+        assertEquals(1.05, policy.calculateCommunityCreatorNewBoost(now.minusDays(21), now), 0.0001)
+        assertEquals(1.05, policy.calculateCommunityCreatorNewBoost(now.minusDays(30), now), 0.0001)
+        assertEquals(1.0, policy.calculateCommunityCreatorNewBoost(now.minusDays(31), now), 0.0001)
+
+        assertEquals(1.5, policy.calculateCreatorNewBoost(now.minusDays(10), now), 0.0001)
+        assertEquals(1.3, policy.calculateCreatorNewBoost(now.minusDays(20), now), 0.0001)
+        assertEquals(1.2, policy.calculateCreatorNewBoost(now.minusDays(30), now), 0.0001)
     }
 
     @Test

src/test/kotlin/kr/co/vividnext/sodalive/v2/recommendation/domain/RecommendationSnapshotWindowPolicyTest.kt

@@ -17,4 +17,14 @@ class RecommendationSnapshotWindowPolicyTest {
         assertEquals(LocalDateTime.of(2026, 7, 9, 15, 0, 0), window.endExclusiveUtc)
         assertEquals(LocalDateTime.of(2026, 7, 9, 14, 59, 59), window.snapshotAt)
     }
+
+    @Test
+    @DisplayName("KST 전날을 포함한 최근 7일을 UTC 조회 범위로 변환한다")
+    fun shouldConvertPreviousKstSevenDaysToUtcWindow() {
+        val window = policy.previousKstSevenDayUtcWindow(LocalDateTime.of(2026, 7, 10, 3, 0, 0))
+
+        assertEquals(LocalDateTime.of(2026, 7, 2, 15, 0, 0), window.startUtc)
+        assertEquals(LocalDateTime.of(2026, 7, 9, 15, 0, 0), window.endExclusiveUtc)
+        assertEquals(LocalDateTime.of(2026, 7, 9, 14, 59, 59), window.snapshotAt)
+    }
 }