fix transformer_test

test/transformer_test.dart

diff --git a/test/transformer_test.dart b/test/transformer_test.dart
index 9216ec2..bddf3f7 100644
--- a/test/transformer_test.dart
+++ b/test/transformer_test.dart
@@ -74,6 +74,7 @@
         }
       '''
     }), {}, [
+      "warning: A value of type \'String\' cannot be assigned to a variable of type \'int\'",
       "error: Type check failed: '2' (String) is not of type int"
     ]);
   });