Add cross-frame compatible Error checking for fail #1758
Merged
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When passing errors through between frames, AssertionErrors and the like will fail an instanceof check against Error. We need a compatible check. According to Mozilla Error Docs, Error prototype will always have message defined.
All tests pass: https://travis-ci.org/outdooricon/mocha/builds/67555897
It's worth noting that this currently prevents us from upgrading the Konacha project to use latest Mocha.