As posted in #1095

@janko-m would it make sense if Uppy had a Shrine integration test? We're occasionally seeing users in our issue tracker, so maybe if we can verify things keep working, and have this working integration to point at, that would save every some time. Not exactly sure yet what that would embody and I don't want to derail this discussion, so created #1105 for further brainstorming :)

+1 / -1? How should we go about it?