feat(tests): updated tests coverage to 66.5%

test/features/chat/models/chat_meta_model_test.dart

@@ -20,6 +20,14 @@ void main() {
 
       expect(model.lastPage, 5);
     });
+
+    test('toJson serializes ChatMetaModel correctly', () {
+      const model = ChatMetaModel(lastPage: 5);
+
+      final json = model.toJson();
+
+      expect(json['last_page'], 5);
+    });
   });
 }