fix tests

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

@@ -223,7 +223,10 @@ void main() {
         final mockDio = MockDio();
         final mockUploader = MockAttachmentUploader();
 
-        const file = AttachmentFile(path: 'filePath/fileName.pdf');
+        const file = AttachmentFile(
+          path: 'filePath/fileName.pdf',
+          size: 100,
+        );
         const channelId = 'testId';
         const channelType = 'messaging';
 
@@ -262,7 +265,10 @@ void main() {
         final mockDio = MockDio();
         final mockUploader = MockAttachmentUploader();
 
-        const image = AttachmentFile(path: 'imagePath/imageName.jpeg');
+        const image = AttachmentFile(
+          path: 'imagePath/imageName.jpeg',
+          size: 100,
+        );
         const channelId = 'testId';
         const channelType = 'messaging';
 

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

@@ -861,10 +861,10 @@ void main() {
           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?.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));

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('livestream:test'));
-      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', () {