Function assert_mode_held

tests/test_async_read_write.py:291–296

(lock_file: str, mode: Literal["read", "write"])

def assert_mode_held(lock_file: str, mode: Literal["read", "write"]) -> None:
    contender = ReadWriteLock(lock_file, is_singleton=False)
    acquire = contender.acquire_write if mode == "read" else contender.acquire_read
    with pytest.raises(Timeout):
        acquire(blocking=False)
    contender.close()