feat(usercreatorchat): openRoom 상대방 프로필을 반환한다

src/test/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/UserCreatorChatServiceTest.kt

@@ -81,6 +81,61 @@ class UserCreatorChatServiceTest {
         Mockito.verify(participantRepository, Mockito.times(2)).save(Mockito.any(UserCreatorChatParticipant::class.java))
     }
 
+    @Test
+    @DisplayName("방 입장 응답은 상대방 닉네임과 프로필 이미지 URL을 포함한다")
+    fun shouldOpenRoomWithOpponentProfileWhenOpponentHasProfileImage() {
+        val user = member(1L, "user")
+        val creator = member(2L, "creator").apply {
+            profileImage = "profile/creator.png"
+        }
+        val room = room(10L)
+        val userParticipant = participant(100L, room, user)
+        val creatorParticipant = participant(101L, room, creator)
+        Mockito.`when`(roomRepository.findByIdAndIsActiveTrue(10L)).thenReturn(room)
+        Mockito.`when`(participantRepository.findActiveByRoomIdAndMemberId(10L, 1L)).thenReturn(userParticipant)
+        Mockito.`when`(participantRepository.findActiveOpponent(10L, 1L)).thenReturn(creatorParticipant)
+        Mockito.`when`(
+            messageRepository.findByChatRoomAndIsActiveTrueOrderByIdDesc(
+                room,
+                PageRequest.of(0, 20)
+            )
+        ).thenReturn(emptyList())
+
+        val response = service.openRoom(user, roomId = 10L)
+
+        assertEquals(10L, response.roomId)
+        assertEquals("creator", response.opponentNickname)
+        assertEquals("https://cdn.test/profile/creator.png", response.opponentProfileImageUrl)
+        assertEquals(emptyList<UserCreatorChatMessageItemDto>(), response.messages)
+        assertFalse(response.hasMore)
+        assertEquals(null, response.nextCursor)
+        Mockito.verify(participantRepository).findActiveOpponent(10L, 1L)
+    }
+
+    @Test
+    @DisplayName("상대방 프로필 이미지가 없으면 방 입장 응답은 기본 프로필 이미지 URL을 반환한다")
+    fun shouldOpenRoomWithDefaultOpponentProfileWhenOpponentProfileImageIsNull() {
+        val user = member(1L, "user")
+        val creator = member(2L, "creator")
+        val room = room(10L)
+        val userParticipant = participant(100L, room, user)
+        val creatorParticipant = participant(101L, room, creator)
+        Mockito.`when`(roomRepository.findByIdAndIsActiveTrue(10L)).thenReturn(room)
+        Mockito.`when`(participantRepository.findActiveByRoomIdAndMemberId(10L, 1L)).thenReturn(userParticipant)
+        Mockito.`when`(participantRepository.findActiveOpponent(10L, 1L)).thenReturn(creatorParticipant)
+        Mockito.`when`(
+            messageRepository.findByChatRoomAndIsActiveTrueOrderByIdDesc(
+                room,
+                PageRequest.of(0, 20)
+            )
+        ).thenReturn(emptyList())
+
+        val response = service.openRoom(user, roomId = 10L)
+
+        assertEquals("creator", response.opponentNickname)
+        assertEquals("https://cdn.test/profile/default-profile.png", response.opponentProfileImageUrl)
+    }
+
     @Test
     @DisplayName("상대방이 같은 방에 입장 중이면 텍스트 메시지를 실시간 전송하고 푸시를 보내지 않는다")
     fun shouldSendRealtimeMessageWithoutPushWhenOpponentIsPresent() {