Tests are failing on Python 3.9

[fabaff]

The async tests are failing during the RPM build process with Python 3.9.

+ /usr/bin/pytest -v tests
============================= test session starts ==============================
platform linux -- Python 3.9.0rc1, pytest-6.0.2, py-1.9.0, pluggy-0.13.1 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /builddir/build/BUILD/pyblackbird-0.5
collecting ... collected 17 items
tests/test_blackbird.py::TestZoneStatus::test_zone_status_broken PASSED  [  5%]
tests/test_blackbird.py::TestBlackbird::test_front_button_status PASSED  [ 11%]
tests/test_blackbird.py::TestBlackbird::test_lock_front_buttons PASSED   [ 17%]
tests/test_blackbird.py::TestBlackbird::test_set_all_zone_source PASSED  [ 23%]
tests/test_blackbird.py::TestBlackbird::test_set_zone_power PASSED       [ 29%]
tests/test_blackbird.py::TestBlackbird::test_set_zone_source PASSED      [ 35%]
tests/test_blackbird.py::TestBlackbird::test_timeout PASSED              [ 41%]
tests/test_blackbird.py::TestBlackbird::test_unlock_front_buttons PASSED [ 47%]
tests/test_blackbird.py::TestBlackbird::test_zone_status PASSED          [ 52%]
tests/test_blackbird.py::TestAsyncBlackbird::test_front_button_status FAILED [ 58%]
tests/test_blackbird.py::TestAsyncBlackbird::test_lock_front_buttons FAILED [ 64%]
tests/test_blackbird.py::TestAsyncBlackbird::test_set_all_zone_source FAILED [ 70%]
tests/test_blackbird.py::TestAsyncBlackbird::test_set_zone_power FAILED  [ 76%]
tests/test_blackbird.py::TestAsyncBlackbird::test_set_zone_source FAILED [ 82%]
tests/test_blackbird.py::TestAsyncBlackbird::test_timeout FAILED         [ 88%]
tests/test_blackbird.py::TestAsyncBlackbird::test_unlock_front_buttons FAILED [ 94%]
tests/test_blackbird.py::TestAsyncBlackbird::test_zone_status FAILED     [100%]
=================================== FAILURES ===================================
_________________ TestAsyncBlackbird.test_front_button_status __________________
self = <tests.test_blackbird.TestAsyncBlackbird testMethod=test_front_button_status>
    def test_front_button_status(self):
        self.responses[b'%9961.\r'] = b'System Locked!\r'
>       status = self.blackbird.lock_status()
tests/test_blackbird.py:78: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/test_blackbird.py:102: in f
    return loop.run_until_complete(blackbird.__getattribute__(item)(*args, **kwargs))
/usr/lib64/python3.9/asyncio/base_events.py:642: in run_until_complete
    return future.result()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
args = (<pyblackbird.get_async_blackbird.<locals>.BlackbirdAsync object at 0x3ffab0eeee0>,)
kwargs = {}
    @asyncio.coroutine
    @wraps(coro)
    def wrapper(*args, **kwargs):
>       with (yield from lock):
E       TypeError: 'Lock' object is not iterable
pyblackbird/__init__.py:280: TypeError
__________________ TestAsyncBlackbird.test_lock_front_buttons __________________
self = <tests.test_blackbird.TestAsyncBlackbird testMethod=test_lock_front_buttons>
    def test_lock_front_buttons(self):
        self.responses[b'/%Lock;\r'] = b'System Locked!\r'
>       self.blackbird.lock_front_buttons()
tests/test_blackbird.py:67: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/test_blackbird.py:102: in f
    return loop.run_until_complete(blackbird.__getattribute__(item)(*args, **kwargs))
/usr/lib64/python3.9/asyncio/base_events.py:642: in run_until_complete
    return future.result()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
args = (<pyblackbird.get_async_blackbird.<locals>.BlackbirdAsync object at 0x3ffa8680cd0>,)
kwargs = {}
    @asyncio.coroutine
    @wraps(coro)
    def wrapper(*args, **kwargs):
>       with (yield from lock):
E       TypeError: 'Lock' object is not iterable
pyblackbird/__init__.py:280: TypeError
[...]

[tirkarthi]

Probably due to python/cpython#17533