added null safety for llc

packages/stream_chat/test/src/models/attachment_test.dart

@@ -49,7 +49,7 @@ void main() {
         'https://media0.giphy.com/media/3o7TKnCdBx5cMg0qti/giphy.gif',
       );
       expect(attachment.actions, hasLength(3));
-      expect(attachment.actions[0], isA<Action>());
+      expect(attachment.actions![0], isA<Action>());
     });
 
     test('should serialize to json correctly', () {

packages/stream_chat/test/src/models/channel_state_test.dart

@@ -10,7 +10,8 @@ import 'package:stream_chat/stream_chat.dart';
 
 void main() {
   group('src/models/channel_state', () {
-    const jsonExample = '''{
+    const jsonExample = '''
+  {
    "channel": {
      "id": "dev",
      "type": "team",
@@ -844,36 +845,36 @@ void main() {
 
     test('should parse json correctly', () {
       final channelState = ChannelState.fromJson(json.decode(jsonExample));
-      expect(channelState.channel.cid, 'team:dev');
-      expect(channelState.channel.id, 'dev');
-      expect(channelState.channel.team, 'test');
-      expect(channelState.channel.type, 'team');
-      expect(channelState.channel.config, isA<ChannelConfig>());
-      expect(channelState.channel.config, isNotNull);
-      expect(channelState.channel.config.commands, hasLength(1));
-      expect(channelState.channel.config.commands[0], isA<Command>());
-      expect(channelState.channel.lastMessageAt,
+      expect(channelState.channel?.cid, 'team:dev');
+      expect(channelState.channel?.id, 'dev');
+      expect(channelState.channel?.team, 'test');
+      expect(channelState.channel?.type, 'team');
+      expect(channelState.channel?.config, isA<ChannelConfig>());
+      expect(channelState.channel?.config, isNotNull);
+      expect(channelState.channel?.config?.commands, hasLength(1));
+      expect(channelState.channel?.config?.commands![0], isA<Command>());
+      expect(channelState.channel?.lastMessageAt,
           DateTime.parse('2020-01-30T13:43:41.062362Z'));
-      expect(channelState.channel.createdAt,
+      expect(channelState.channel?.createdAt,
           DateTime.parse('2019-04-03T18:43:33.213373Z'));
-      expect(channelState.channel.updatedAt,
+      expect(channelState.channel?.updatedAt,
           DateTime.parse('2019-04-03T18:43:33.213374Z'));
-      expect(channelState.channel.createdBy, isA<User>());
-      expect(channelState.channel.frozen, true);
-      expect(channelState.channel.extraData['example'], 1);
-      expect(channelState.channel.extraData['name'], '#dev');
+      expect(channelState.channel?.createdBy, isA<User>());
+      expect(channelState.channel?.frozen, true);
+      expect(channelState.channel?.extraData!['example'], 1);
+      expect(channelState.channel?.extraData!['name'], '#dev');
       expect(
-        channelState.channel.extraData['image'],
+        channelState.channel?.extraData!['image'],
         'https://cdn.chrisshort.net/testing-certificate-chains-in-go/GOPHER_MIC_DROP.png',
       );
       expect(channelState.messages, hasLength(25));
-      expect(channelState.messages[0], isA<Message>());
-      expect(channelState.messages[0], isNotNull);
+      expect(channelState.messages![0], isA<Message>());
+      expect(channelState.messages![0], isNotNull);
       expect(
-        channelState.messages[0].createdAt,
+        channelState.messages![0].createdAt,
         DateTime.parse('2020-01-29T03:23:02.843948Z'),
       );
-      expect(channelState.messages[0].user, isA<User>());
+      expect(channelState.messages![0].user, isA<User>());
       expect(channelState.watcherCount, 5);
     });
 

packages/stream_chat/test/src/models/channel_test.dart

@@ -20,8 +20,8 @@ void main() {
       expect(channel.id, equals('test'));
       expect(channel.type, equals('livestream'));
       expect(channel.cid, equals('test:livestream'));
-      expect(channel.extraData['cats'], equals(true));
-      expect(channel.extraData['fruit'], equals(['bananas', 'apples']));
+      expect(channel.extraData!['cats'], equals(true));
+      expect(channel.extraData!['fruit'], equals(['bananas', 'apples']));
     });
 
     test('should serialize to json correctly', () {

packages/stream_chat/test/src/models/reaction_test.dart

@@ -33,7 +33,7 @@ void main() {
       expect(reaction.createdAt, DateTime.parse('2020-01-28T22:17:31.108742Z'));
       expect(reaction.type, 'wow');
       expect(
-        reaction.user.toJson(),
+        reaction.user?.toJson(),
         User.init('2de0297c-f3f2-489d-b930-ef77342edccf', extraData: {
           'image': 'https://randomuser.me/api/portraits/women/45.jpg',
           'name': 'Daisy Morgan'

packages/stream_chat/test/src/models/read_test.dart

@@ -19,7 +19,7 @@ void main() {
     test('should parse json correctly', () {
       final read = Read.fromJson(json.decode(jsonExample));
       expect(read.lastRead, DateTime.parse('2020-01-28T22:17:30.966485504Z'));
-      expect(read.user.id, 'bbb19d9a-ee50-45bc-84e5-0584e79d0c9e');
+      expect(read.user?.id, 'bbb19d9a-ee50-45bc-84e5-0584e79d0c9e');
       expect(read.unreadMessages, 10);
     });