# expected bits.
exc = self._run_failing_graph(SourceWithFailingIter, SinkWithExceptionChaining)
s = str(exc)
- self.assertIn('[src (out): src.SourceWithFailingIter]', s)
+ self.assertIn("[src (out): 'source.SourceWithFailingIter']", s)
self.assertIn('ValueError: oops', s)