This fixes one of the 2 blockers to using pytest instead of Trial (which
is not formally-motivated, but sometimes seems like an interesting idea
because
pytest has seen a lot of developer experience features that Trial
hasn't. It would also removes one more coupling to the Twisted
framework.)
---
The `test_` prefix to this test helper makes it appear as a test to
pytest.
We *can* set a `__test__ = False` attribute on the test, but it felt
cleaner to just rename it (as I also thought it would be a test from
that name!).
This was previously reported as:
https://github.com/element-hq/synapse/issues/18665
---------
Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>
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