feat(user-creator-chat): 미접속 상대 푸시를 발행한다

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

@@ -251,6 +251,34 @@ class UserCreatorChatServiceTest {
         Mockito.verifyNoInteractions(eventPublisher)
     }
 
+    @Test
+    @DisplayName("WebSocket 텍스트 전송은 상대방 presence가 없으면 채팅방 이동용 푸시 이벤트를 발행한다")
+    fun shouldPublishPushEventWithChatPayloadWhenOpponentPresenceDoesNotExist() {
+        val user = member(1L, "user")
+        val creator = member(2L, "creator")
+        val room = room(10L)
+        val senderParticipant = participant(100L, room, user)
+        val recipientParticipant = participant(101L, room, creator)
+        Mockito.`when`(roomRepository.findByIdAndIsActiveTrue(10L)).thenReturn(room)
+        Mockito.`when`(participantRepository.findActiveByRoomIdAndMemberId(10L, 1L)).thenReturn(senderParticipant)
+        Mockito.`when`(participantRepository.findActiveOpponent(10L, 1L)).thenReturn(recipientParticipant)
+        Mockito.`when`(presenceService.hasPresence(10L, 2L)).thenReturn(false)
+        Mockito.`when`(messageRepository.save(Mockito.any(UserCreatorChatMessage::class.java))).thenAnswer { invocation ->
+            (invocation.arguments[0] as UserCreatorChatMessage).apply { id = 204L }
+        }
+
+        service.sendTextMessageByWebSocket(memberId = 1L, roomId = 10L, textMessage = "hello")
+
+        val eventCaptor = ArgumentCaptor.forClass(FcmEvent::class.java)
+        Mockito.verify(eventPublisher).publishEvent(eventCaptor.capture())
+        assertEquals(FcmEventType.INDIVIDUAL, eventCaptor.value.type)
+        assertEquals(listOf(2L), eventCaptor.value.recipients)
+        assertEquals(10L, eventCaptor.value.roomId)
+        assertEquals(204L, eventCaptor.value.messageId)
+        assertEquals("USER_CREATOR", eventCaptor.value.chatType)
+        Mockito.verifyNoInteractions(roomMessageBroker)
+    }
+
     @Test
     @DisplayName("커서가 있으면 기본 20개 기준으로 이전 메시지를 조회한다")
     fun shouldGetPreviousMessagesWithDefaultLimitWhenCursorExists() {