@classmethod
def setup_class(cls):
    print(f'setup class with {cls.context}')
    global _test_event
    if (_test_event is None):
        _test_event = cls.context.Event()
@classmethod
def setup_class(cls):
    print(f'setup class with {cls.context}')
    global _test_event
    if (_test_event is None):
        _test_event = cls.context.Event()