feat(tests): updated tests coverage to 66.5%

test/features/chat/models/chat_messages_model_test.dart

@@ -37,5 +37,30 @@ void main() {
       expect(model.messagesList.first.data, 'First message');
       expect(model.meta.lastPage, 1);
     });
+
+    test('toJson serializes ChatMessagesModel correctly', () {
+      final message = ChatMessageModel(
+        id: 1,
+        data: 'Test message',
+        mediaData: null,
+        authorId: 123,
+        updatedAt: DateTime(2024, 1, 1, 12, 0, 0),
+        isRead: false,
+        isCurrentUserAuthor: true,
+        roomId: 'room-1',
+        type: 'text',
+      );
+
+      const meta = ChatMetaModel(lastPage: 1);
+
+      final model = ChatMessagesModel(messagesList: [message], meta: meta);
+
+      final json = model.toJson();
+
+      expect(json, isNotNull);
+      expect(json, isA<Map<String, dynamic>>());
+      expect(json.containsKey('data'), isTrue);
+      expect((json['data'] as List).length, 1);
+    });
   });
 }