fix(dm): WebSocket 연결 완료 시점을 보정한다

app/src/test/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModelTest.kt

@@ -323,9 +323,11 @@ class DmChatRoomViewModelTest {
         viewModel.enter(roomId = 10L, creatorId = 0L)
 
         viewModel.connectRealtime()
+        assertEquals(false, viewModel.isRealtimeConnectedForTest())
         socketFactory.emitJoined()
 
         assertEquals(listOf(RealtimeConnectCall("test-token", 10L)), socketFactory.connectCalls)
+        assertEquals(true, viewModel.isRealtimeConnectedForTest())
         assertEquals(listOf(MessagesCall("Bearer test-token", 10L, null, 20)), api.messagesCalls)
         val state = viewModel.chatRoomStateLiveData.requireValue() as DmChatRoomUiState.Content
         assertEquals(listOf(1L, 2L), state.messages.map { it.messageId })
@@ -340,6 +342,8 @@ class DmChatRoomViewModelTest {
         viewModel.connectRealtime()
 
         assertEquals(listOf(RealtimeConnectCall("test-token", 10L)), socketFactory.connectCalls)
+        assertEquals(1, socketFactory.webSocket.sentTexts.size)
+        assertEquals("JOIN_ROOM", socketFactory.webSocket.sentJsonAt(0).get("type").asString)
     }
 
     @Test
@@ -651,6 +655,12 @@ class DmChatRoomViewModelTest {
             method.isAccessible = true
             method.invoke(this)
         }
+
+        fun DmChatRoomViewModel.isRealtimeConnectedForTest(): Boolean {
+            val field = DmChatRoomViewModel::class.java.getDeclaredField("isRealtimeConnected")
+            field.isAccessible = true
+            return field.getBoolean(this)
+        }
     }
 }