ref(llc): add fileSize, mimeType in attachment.dart

Signed-off-by: xsahil03x <[email protected]>

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

@@ -1,5 +1,6 @@
 import 'package:stream_chat/src/core/models/action.dart';
 import 'package:stream_chat/src/core/models/attachment.dart';
+import 'package:stream_chat/src/core/models/attachment_file.dart';
 import 'package:test/test.dart';
 
 import '../../utils.dart';
@@ -41,5 +42,59 @@ void main() {
         },
       );
     });
+
+    test('name property and extraData manipulation', () {
+      final file = AttachmentFile(size: 3, path: 'myfolder/myfile.txt');
+      final attachment = Attachment(file: file);
+
+      expect(attachment.fileSize, 3);
+      expect(attachment.mimeType, 'text/plain');
+      expect(attachment.toJson(), {
+        'title': 'myfile.txt',
+        'actions': [],
+        'file_size': 3,
+        'mime_type': 'text/plain'
+      });
+      expect(Attachment.fromJson(attachment.toJson()).toJson(), {
+        'title': 'myfile.txt',
+        'actions': [],
+        'file_size': 3,
+        'mime_type': 'text/plain'
+      });
+
+      // Setting the size and mimeType using extraData should work fine
+      var newAttachment = Attachment(
+        extraData: const {
+          'file_size': 6,
+          'mime_type': 'application/pdf',
+        },
+      );
+
+      expect(newAttachment.extraData['file_size'], 6);
+      expect(newAttachment.extraData['mime_type'], 'application/pdf');
+      expect(newAttachment.fileSize, 6);
+      expect(newAttachment.mimeType, 'application/pdf');
+
+      // switching a new file should update size and mimeType
+      final fileTwo = AttachmentFile(size: 12, path: 'myfolder/fileTwo.pdf');
+      newAttachment = attachment.copyWith(file: fileTwo);
+
+      expect(newAttachment.extraData['file_size'], 12);
+      expect(newAttachment.extraData['mime_type'], 'application/pdf');
+      expect(newAttachment.fileSize, 12);
+      expect(newAttachment.mimeType, 'application/pdf');
+
+      // if file is available, should override size and mimeType.
+      final fileThree = AttachmentFile(size: 9, path: 'myfolder/fileThree.png');
+      newAttachment = attachment.copyWith(file: fileThree, extraData: {
+        'file_size': 88,
+        'mime_type': 'application/pdf',
+      });
+
+      expect(newAttachment.extraData['file_size'], 9);
+      expect(newAttachment.extraData['mime_type'], 'image/png');
+      expect(newAttachment.fileSize, 9);
+      expect(newAttachment.mimeType, 'image/png');
+    });
   });
 }