test: add tests for stream chat flutter (#335)

* feat: Added tests

* feat: Added header test

* feat: Added new tests

* fix

* feat: Added test, fmt

* feat: Added delete test

* added system and unread ind tests

* fix: analysis

* added new tests

* fix: analysis

* added tests

* add attachment actions modal tests

* fix analysis

* fix analysis

* add backbutton tests

* fix analysis

* increase timeout

* add channelheader tests

* add infotile tests

* add reactions modal and channel unread indicator tests

* add golden test for reaction bubble

* add dark tests

* add system message golden

* add deletd message golden

* add message action modal tests

* update goldens

* update workflow runner

* update goldens

* remove channel unread indicator in favor of unread indicator

* move file and media screen to sample app

* add channel image tesst

* add channel_list_header test

* add thread_header test

* bump up test threashold

* fix review

Co-authored-by: Salvatore Giordano <[email protected]>

packages/stream_chat_flutter/lib/src/message_input.dart

@@ -693,7 +693,7 @@ class MessageInputState extends State<MessageInput> {
         if (!mounted) {
           return;
         }
-        StreamChannel.of(context).channel.keyStroke().catchError((e) {});
+        StreamChannel.of(context).channel.keyStroke()?.catchError((e) {});
 
         setState(() {
           _messageIsPresent = s.trim().isNotEmpty;
@@ -2181,10 +2181,12 @@ class MessageInputState extends State<MessageInput> {
   void _parseExistingMessage(Message message) {
     textEditingController.text = message.text;
     _messageIsPresent = true;
-    for (final attachment in message?.attachments) {
-      _attachments[attachment.id] = attachment.copyWith(
-        uploadState: attachment.uploadState ?? UploadState.success(),
-      );
+    if (message.attachments != null) {
+      for (final attachment in message.attachments) {
+        _attachments[attachment.id] = attachment.copyWith(
+          uploadState: attachment.uploadState ?? UploadState.success(),
+        );
+      }
     }
   }