test(user-creator-chat): 크리에이터 시작 DM 생성을 검증한다

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

@@ -31,6 +31,42 @@ class UserCreatorChatServiceIntegrationTest @Autowired constructor(
     private val messageRepository: UserCreatorChatMessageRepository,
     private val entityManager: EntityManager
 ) {
+    @Test
+    @DisplayName("기존 리스너 시작 DM 방 생성 흐름은 계속 동작한다")
+    fun shouldCreateRoomWhenListenerStartsDmToCreator() {
+        val user = memberRepository.save(Member(email = "listener-start@test.com", password = "pw", nickname = "listener"))
+        val creator = memberRepository.save(
+            Member(email = "creator-target@test.com", password = "pw", nickname = "creator", role = MemberRole.CREATOR)
+        )
+        entityManager.flush()
+        entityManager.clear()
+
+        val response = service.createOrGetRoom(user, creator.id!!)
+
+        assertEquals(1, roomRepository.findAll().size)
+        assertEquals(roomRepository.findAll().single().id, response.roomId)
+        assertEquals(2, participantRepository.findAll().size)
+        assertEquals(0, messageRepository.findAll().size)
+    }
+
+    @Test
+    @DisplayName("크리에이터도 일반 회원에게 DM 방을 먼저 생성할 수 있다")
+    fun shouldCreateRoomWhenCreatorStartsDmToListener() {
+        val creator = memberRepository.save(
+            Member(email = "creator-start@test.com", password = "pw", nickname = "creator", role = MemberRole.CREATOR)
+        )
+        val listener = memberRepository.save(Member(email = "listener-target@test.com", password = "pw", nickname = "listener"))
+        entityManager.flush()
+        entityManager.clear()
+
+        val response = service.createOrGetRoom(creator, listener.id!!)
+
+        assertEquals(1, roomRepository.findAll().size)
+        assertEquals(roomRepository.findAll().single().id, response.roomId)
+        assertEquals(2, participantRepository.findAll().size)
+        assertEquals(0, messageRepository.findAll().size)
+    }
+
     @Test
     @DisplayName("AI 캐릭터용 Member와는 유저-크리에이터 DM 방을 생성할 수 없다")
     fun shouldRejectCreateRoomWhenCreatorIsAiCharacterMember() {

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

@@ -8,6 +8,7 @@ import kr.co.vividnext.sodalive.fcm.FcmEvent
 import kr.co.vividnext.sodalive.fcm.FcmEventType
 import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.MemberRepository
+import kr.co.vividnext.sodalive.member.MemberRole
 import kr.co.vividnext.sodalive.member.block.BlockMemberRepository
 import kr.co.vividnext.sodalive.v2.usercreatorchat.dto.UserCreatorChatMessageItemDto
 import kr.co.vividnext.sodalive.v2.usercreatorchat.repository.UserCreatorChatMessageRepository
@@ -93,6 +94,43 @@ class UserCreatorChatServiceTest {
         Mockito.verify(participantRepository, Mockito.times(2)).save(Mockito.any(UserCreatorChatParticipant::class.java))
     }
 
+    @Test
+    @DisplayName("크리에이터도 일반 회원에게 DM 방을 먼저 생성할 수 있고 메시지는 생성하지 않는다")
+    fun shouldCreateRoomWhenCreatorStartsDmToUser() {
+        val creator = member(1L, "creator").apply { role = MemberRole.CREATOR }
+        val user = member(2L, "user")
+        Mockito.`when`(memberRepository.findById(2L)).thenReturn(Optional.of(user))
+        Mockito.`when`(roomRepository.findActiveRoomByParticipantMemberIds(1L, 2L)).thenReturn(null)
+        Mockito.`when`(roomRepository.save(Mockito.any(UserCreatorChatRoom::class.java))).thenAnswer { invocation ->
+            (invocation.arguments[0] as UserCreatorChatRoom).apply { id = 10L }
+        }
+
+        val response = service.createOrGetRoom(creator, 2L)
+
+        assertEquals(10L, response.roomId)
+        val participantCaptor = ArgumentCaptor.forClass(UserCreatorChatParticipant::class.java)
+        Mockito.verify(participantRepository, Mockito.times(2)).save(participantCaptor.capture())
+        assertEquals(listOf(creator, user), participantCaptor.allValues.map { it.member })
+        Mockito.verifyNoInteractions(messageRepository)
+    }
+
+    @Test
+    @DisplayName("기존 활성 방이 있으면 새 방과 메시지를 생성하지 않고 기존 roomId를 반환한다")
+    fun shouldReturnExistingRoomWithoutCreatingMessage() {
+        val creator = member(1L, "creator").apply { role = MemberRole.CREATOR }
+        val user = member(2L, "user")
+        val existingRoom = room(10L)
+        Mockito.`when`(memberRepository.findById(2L)).thenReturn(Optional.of(user))
+        Mockito.`when`(roomRepository.findActiveRoomByParticipantMemberIds(1L, 2L)).thenReturn(existingRoom)
+
+        val response = service.createOrGetRoom(creator, 2L)
+
+        assertEquals(10L, response.roomId)
+        Mockito.verify(roomRepository, Mockito.never()).save(Mockito.any(UserCreatorChatRoom::class.java))
+        Mockito.verifyNoInteractions(participantRepository)
+        Mockito.verifyNoInteractions(messageRepository)
+    }
+
     @Test
     @DisplayName("방 입장 응답은 상대방 닉네임과 프로필 이미지 URL을 포함한다")
     fun shouldOpenRoomWithOpponentProfileWhenOpponentHasProfileImage() {