It looks like the relevant test is here: https://github.com/python/cpython/blob/a1092f62492a3fcd6195bea94eccf8d5a300acb1/Lib/test/test_asyncio/test_locks.py#L722-L727 def test_explicit_lock(self): lock = asyncio.Lock() cond = asyncio.Condition(lock) self.assertIs(cond._lock, lock) self.assertIs(cond._loop, lock._loop) But... that test doesn't appear to run inside an event loop, so it's not covering the behaviour described in this issue.