L. David Baron writes:

>> On 20/11/14 17:56, Boris Zbarsky wrote:
>> > Ah, we can't.  We can whitelist the number of assertions in a mochitest
>> > (or a number range if the number is not quite stable), but not the text
>> > of the assertion.
>
> On Thursday 2014-11-20 18:05 +0100, David Rajchenbach-Teller wrote:
>> I believe that we can provide something less fragile than that.
>
> It's not all that fragile, since most tests don't have known
> assertions, so in that vast majority of tests, we have test coverage
> of regressions of assertion counts.
>
> This covers reftests, crashtests, and all mochitests except for
> mochitest-browser-chrome (bug 847275 covers doing it there).

runcppunittests.py, runxpcshelltests.py, and rungtests.py use
XPCOM_DEBUG_BREAK=stack-and-abort so we should have coverage there
too.

When web-platform-tests run with debug builds, we can do the same
there because known crashes can be annotated in those tests.

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