feat(ranking): 랭킹 내부 모델을 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/ranking/domain/CreatorRankingItem.kt

@@ -0,0 +1,10 @@
+package kr.co.vividnext.sodalive.v2.ranking.domain
+
+data class CreatorRankingItem(
+    val rank: Int,
+    val rankChange: Int?,
+    val isNew: Boolean,
+    val creatorId: Long,
+    val nickname: String,
+    val profileImageUrl: String?
+)

src/main/kotlin/kr/co/vividnext/sodalive/v2/ranking/domain/CreatorRankingSnapshotCandidate.kt

@@ -0,0 +1,21 @@
+package kr.co.vividnext.sodalive.v2.ranking.domain
+
+data class CreatorRankingSnapshotCandidate(
+    val creatorId: Long,
+    val nickname: String,
+    val profileImageUrl: String?,
+    val finalScore: Double,
+    val contentLiveScore: Double,
+    val engagementScore: Double,
+    val supportScore: Double,
+    val fanLoyaltyScore: Double,
+    val liveCanAmount: Long,
+    val contentPurchaseCanAmount: Long,
+    val contentLikeCount: Long,
+    val contentCommentCount: Long,
+    val channelDonationCanAmount: Long,
+    val channelDonationCount: Long,
+    val fanTalkCount: Long,
+    val finalFollowerCount: Long,
+    val followIncrease: Long
+)

src/test/kotlin/kr/co/vividnext/sodalive/v2/ranking/application/CreatorRankingQueryServiceTest.kt

@@ -0,0 +1,52 @@
+package kr.co.vividnext.sodalive.v2.ranking.application
+
+import kr.co.vividnext.sodalive.v2.ranking.domain.CreatorRankingItem
+import kr.co.vividnext.sodalive.v2.ranking.domain.CreatorRankingSnapshotCandidate
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+
+class CreatorRankingQueryServiceTest {
+    @Test
+    @DisplayName("스냅샷 후보와 조회 item 내부 모델은 순위 변화와 신규 진입 값을 담을 수 있다")
+    fun shouldCreateRankingDomainModelsForLaterQueryService() {
+        val candidate = CreatorRankingSnapshotCandidate(
+            creatorId = 1L,
+            nickname = "creator",
+            profileImageUrl = "profile.png",
+            finalScore = 100.0,
+            contentLiveScore = 10.0,
+            engagementScore = 20.0,
+            supportScore = 30.0,
+            fanLoyaltyScore = 40.0,
+            liveCanAmount = 100,
+            contentPurchaseCanAmount = 200,
+            contentLikeCount = 3,
+            contentCommentCount = 4,
+            channelDonationCanAmount = 500,
+            channelDonationCount = 6,
+            fanTalkCount = 7,
+            finalFollowerCount = 8,
+            followIncrease = -1
+        )
+        val item = CreatorRankingItem(
+            rank = 1,
+            rankChange = null,
+            isNew = true,
+            creatorId = candidate.creatorId,
+            nickname = candidate.nickname,
+            profileImageUrl = candidate.profileImageUrl
+        )
+        val fallenItem = item.copy(rank = 2, rankChange = -1, isNew = false)
+
+        assertEquals(1L, candidate.creatorId)
+        assertEquals(100.0, candidate.finalScore, 0.0001)
+        assertNull(item.rankChange)
+        assertTrue(item.isNew)
+        assertEquals(-1, fallenItem.rankChange)
+        assertFalse(fallenItem.isNew)
+    }
+}