Summary:
This makes it so that React Native unit tests will fail if code unexpectedly outputs a warning or error (which would show as a redbox error).
This logic split out from the normal `jest/setup.js` which is included by the jest-preset, to only effect our tests instead of existing RN Jest users.
Changelog:
[Internal][Changed] - Fail tests on `console.error()` or `console.warn()`
Reviewed By: huntie
Differential Revision: D41564032
fbshipit-source-id: 3cc7d3a8433fcb75f654669b9c350dea2da937a8
Nick Gerleman