Add allowed_warnings
to yaml tests (backport of #53139)
#53173
Merged
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When we test backwards compatibility we often end up in a situation
where we sometimes get a warning, and sometimes don't. Like, we won't
get the warning if we're testing against an older version, but we will
in a newer one. Or we won't get the warning if the request randomly
lands on a node with an old version of the code. But we wouldn't if it
randomed into a node with newer code.
This adds
allowed_warnings
to our yaml test runner for those cases:warnings declared this way are "allowed" but not "required".
Blocks #52959