How to use the socketshark.constants.ERR_AUTH_UNSUPPORTED function in socketshark

async def test_auth_invalid(self):
        """
        Test invalid authentication method
        """
        shark = SocketShark(TEST_CONFIG)
        client = MockClient(shark)
        session = client.session

        await session.on_client_event({'event': 'auth', 'method': 'x'})
        assert client.log.pop() == {
            'status': 'error',
            'event': 'auth',
            'error': c.ERR_AUTH_UNSUPPORTED,
        }

        no_auth_config = TEST_CONFIG.copy()
        no_auth_config['AUTHENTICATION'] = {}
        shark = SocketShark(no_auth_config)
        session = Session(shark, client)

        await session.on_client_event({'event': 'auth', 'method': 'ticket'})
        assert client.log.pop() == {
            'status': 'error',
            'event': 'auth',
            'error': c.ERR_AUTH_UNSUPPORTED,
        }

        assert not client.log

async def process(self):
        if self.method not in self.auth_config:
            raise EventError(c.ERR_AUTH_UNSUPPORTED)

        # The only supported method.
        assert self.method == 'ticket'

        auth_method_config = self.auth_config[self.method]

        ticket = self.data.get('ticket')
        if not ticket:
            raise EventError(c.ERR_NEEDS_TICKET)

        auth_url = auth_method_config['validation_url']
        auth_fields = auth_method_config['auth_fields']
        result = await http_post(self.shark, auth_url, {'ticket': ticket})
        if result.get('status') != 'ok':
            raise EventError(result.get('error', c.ERR_AUTH_FAILED))
        auth_info = {field: result[field] for field in auth_fields}