Follow up about Jest issues

[gaearon]

Before cutting 2.0 final I'd like to have a good understanding of these:

• Unhandled Promise Rejection Logging jestjs/jest#3251 (comment) (potential regression in Jest 21+)
• "DeprecationWarning: Unhandled promise rejections are deprecated" jestjs/jest#5311 (just a weird warning)

[gaearon]

cc @SimenB

[SimenB]

The first is indeed a regression of sorts, although I'm unsure how to handle it in a way that satisfies all parties. I do think it's more important to not silently pass tests creating rejected promises than allowing you to asynchronously attach catch. But I do understand it's something that could be useful.

I've responded to the second issue, that feels more like a bug.