Fix tests for tornado+pytest issue #943
Merged
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These are two small fixes to get clean test runs.
I realized that even if tornado releases with the fix from pytest, we won't instantly drop support for older tornado versions. So the workaround suggested by a pytest dev is what I'm applying here.
I setup a base test class which we can tweak appropriately and set
__test__ = False
to keep pytest from trying to run tests from that class (which fails in other ways).On my way to this, I found I needed a very minor mypy tweak, which is isolated in a separate commit.