Sample

I'm suspecting this has something to do with the Pipeline as it detects the failure, but the failure isn't propagated further: https://github.com/flutter/engine/blob/fa737ace596c6a8309b6f9aa26803278ed942892/lib/web_ui/dev/watcher.dart#L53

I'm not sure why only integration tests are affected. I checked the unit-tests and they do result in a non-zero exit code.

/cc @mdebbar