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/simple_frame.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+
+class SimpleFrame extends StatelessWidget {
+  final Widget child;
+
+  const SimpleFrame({Key key, @required this.child}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.all(4),
+      decoration: BoxDecoration(
+        color: const Color(0xFFFFFFFF),
+        border: Border.all(color: const Color(0xFF9E9E9E)),
+      ),
+      child: child,
+    );
+  }
+}