diff --git a/TelegramBotAPI-core/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/SimpleInputFilesTest.kt b/TelegramBotAPI-core/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/SimpleInputFilesTest.kt
index b3fa9127e2..1da2a34a55 100644
--- a/TelegramBotAPI-core/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/SimpleInputFilesTest.kt
+++ b/TelegramBotAPI-core/src/commonTest/kotlin/com/github/insanusmokrassar/TelegramBotAPI/SimpleInputFilesTest.kt
@@ -24,6 +24,7 @@ class SimpleInputFilesTest {
             )
         )
         val inputMedia = photoContent.toMediaGroupMemberInputMedia()
+        assertEquals(photoContent.media.fileId, inputMedia.file)
         val encoded = nonstrictJsonFormat.encodeToString(
             MediaGroupMemberInputMediaSerializer,
             inputMedia