@classmethod
def teardown_class(cls):
    print(f'teardown class with {cls.context}')
    global _test_event
    if (_test_event is not None):
        _test_event = None
@classmethod
def teardown_class(cls):
    print(f'teardown class with {cls.context}')
    global _test_event
    if (_test_event is not None):
        _test_event = None