[Feature] - Multiple tests compared to a single golden #44
Description
It's possible that multiple, independent golden tests, might want to compare against the same source golden. Perhaps there are different ways of painting the same thing, and a developer wants to make sure that they all really do paint the same thing.
Make it possible for this use-case to work, both when reporting errors, and when generating new goldens. I'm not sure what should happen when generating new goldens, because each of these tests would overwrite the same image. Maybe that's OK, maybe it isn't.