fix(creator): 후원 empty 실패 메시지를 표시한다

app/src/test/java/kr/co/vividnext/sodalive/v2/creator/channel/donation/CreatorChannelDonationViewModelTest.kt

@@ -133,6 +133,25 @@ class CreatorChannelDonationViewModelTest {
         assertEquals(0, SharedPreferenceManager.can)
     }
 
+    @Test
+    fun `Empty 상태에서 채널 후원 실패는 action toast message를 emit하고 consume한다`() {
+        stubGetDonations(response = Single.just(ApiResponse(true, donationResponse(donationCount = 0, ids = emptyList()), null)))
+        whenever(repository.postChannelDonation(100L, 50, false, "응원", "Bearer test-token")).thenReturn(
+            Single.just(ApiResponse(false, Any(), "후원 실패"))
+        )
+        viewModel.loadDonations(100L, isOwner = false)
+
+        viewModel.postChannelDonation(can = 50, isSecret = false, message = "응원")
+
+        val state = viewModel.donationStateLiveData.requireValue() as CreatorChannelDonationUiState.Empty
+        assertEquals("후원 실패", state.actionToastMessage)
+
+        viewModel.consumeActionToastMessage()
+
+        val consumed = viewModel.donationStateLiveData.requireValue() as CreatorChannelDonationUiState.Empty
+        assertEquals(null, consumed.actionToastMessage)
+    }
+
     private fun stubGetDonations(
         page: Int = 0,
         response: Single<ApiResponse<CreatorChannelDonationTabResponse>>