How to use the socketshark.constants function in socketshark

async def test_invalid_message(self):
        """
        Test basic validation of event messages.
        """
        shark = SocketShark(TEST_CONFIG)
        client = MockClient(shark)
        session = client.session

        await session.on_client_event(None)
        assert client.log.pop() == {
            'status': 'error',
            'error': c.ERR_INVALID_EVENT,
        }

        await session.on_client_event('hello')
        assert client.log.pop() == {
            'status': 'error',
            'error': c.ERR_INVALID_EVENT,
        }

        await session.on_client_event({})
        assert client.log.pop() == {
            'status': 'error',
            'error': c.ERR_INVALID_EVENT,
        }

        await session.on_client_event({'event': None})
        assert client.log.pop() == {

def __init__(self, session, data):
        super().__init__(session, data)
        self.auth_config = self.config['AUTHENTICATION']
        self.method = data.get('method', c.DEFAULT_AUTH_METHOD)

def from_data(cls, session, data):
        if not isinstance(data, dict) or 'event' not in data:
            return InvalidEvent(session)

        event = data['event']

        # Make sure we don't echo back large messages.
        if not isinstance(event, str) or len(event) > c.MAX_EVENT_LENGTH:
            return InvalidEvent(session)

        cls = {
            'auth': AuthEvent,
            'message': MessageEvent,
            'subscribe': SubscribeEvent,
            'unsubscribe': UnsubscribeEvent,
        }.get(event)

        if cls:
            return cls(session, data)
        else:
            return UnknownEvent(session, data)