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/test/src/mocks.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:mockito/mockito.dart';
 import 'package:stream_chat_flutter_core/stream_chat_flutter_core.dart';
 
@@ -8,3 +9,9 @@ class MockClientState extends Mock implements ClientState {}
 class MockChannel extends Mock implements Channel {}
 
 class MockChannelState extends Mock implements ChannelClientState {}
+
+class MockNavigatorObserver extends Mock implements NavigatorObserver {}
+
+class MockVoidCallback extends Mock {
+  void call();
+}