async_case passes loop parameter to the queue used to collect tests and this causes below DeprecationWarning with last change over deprecation in queues and locks API.

./python.exe -m unittest Lib.unittest.test.test_async_case
/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/unittest/async_case.py:116: DeprecationWarning: The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.
  self._asyncioCallsQueue = asyncio.Queue(loop=loop)
/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/asyncio/queues.py:48: DeprecationWarning: The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.
  self._finished = locks.Event(loop=self._loop)
.......
----------------------------------------------------------------------
Ran 7 tests in 0.083s

OK