follow-up 70d1e1170e
```
=============================== warnings summary ===============================
tests/test_util.py::TestUtil::test_custom_task_factory
/tmp/cirrus-ci-build/tests/test_util.py:504: RuntimeWarning: coroutine 'TestUtil.test_custom_task_factory.<locals>.foo' was never awaited
self.assertEqual(foo().__qualname__, task.get_coro().__qualname__)
Enable tracemalloc to get traceback where the object was allocated.
See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.
```
5c17f452b1