fix(dm): creatorId 방 열기 thread를 보정한다

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

@@ -280,6 +280,7 @@ class DmChatRoomViewModel(
                     val data = response.requireData()
                     repository.openRoom(token = authToken(), roomId = data.roomId)
                 }
+                .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(
                     { handleOpenRoomResult(it) },
                     { handleError(it) }

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

@@ -113,6 +113,25 @@ class DmChatRoomViewModelTest {
         assertEquals(12L, state.roomId)
     }
 
+    @Test
+    fun `creatorId 진입은 openRoom 결과 처리 전에 main thread로 다시 전환한다`() {
+        val source = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/v2/main/chat/dm/DmChatRoomViewModel.kt"
+        ).readText()
+        val createRoomAndOpenSource = source
+            .substringAfter("private fun createRoomAndOpen")
+            .substringBefore("private fun openRoom")
+            .filterNot { it.isWhitespace() }
+
+        assertTrue(
+            "CreateOrGetRoom 이후 OpenRoom 결과는 LiveData 갱신 전 main thread로 재전환되어야 한다.",
+            createRoomAndOpenSource.contains(
+                ".flatMap{response->valdata=response.requireData()repository.openRoom(token=authToken(),roomId=data.roomId)}" +
+                    ".observeOn(AndroidSchedulers.mainThread()).subscribe("
+            )
+        )
+    }
+
     @Test
     fun `유효하지 않은 진입 값은 종료 이벤트를 발행한다`() {
         viewModel.enter(roomId = 0L, creatorId = 0L)