JUnit 4.13 isn't released yet, but these functions are essential to being
able to write good test assertions about thrown exceptions. Rather than
not using them until JUnit 4.13 comes out (which might be awhile, as JUnit
4.12 came out almost three years ago), we're making the same decision that
Google made internally, which is to backport them. Indeed, the only reason
this commit is necessary is to fix breakage in the Nomulus build, as the
existing code worked fine internally where the backports are already in
place.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173435579
