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

'error': c.ERR_AUTH_REQUIRED,
        }

        await self._auth_session(session)

        with aioresponses() as mock:
            # Authorizer is unavailable.
            await session.on_client_event({
                'event': 'subscribe',
                'subscription': 'authorizer.topic',
            })
            assert client.log.pop() == {
                'event': 'subscribe',
                'subscription': 'authorizer.topic',
                'status': 'error',
                'error': c.ERR_SERVICE_UNAVAILABLE,
            }

        with aioresponses() as mock:
            # Mock authorizer
            authorizer_url = 'http://auth-service/auth/authorizer/'

            mock.post(authorizer_url, payload={
                'status': 'error',
            })

            mock.post(authorizer_url, payload={
                'status': 'error',
                'error': 'test error',
            })

            mock.post(authorizer_url, payload={

for n in range(opts['tries']):
            if n > 0:
                await asyncio.sleep(opts['wait'])
            try:
                shark.log.debug('http request', url=url, data=data)
                async with session.post(url, json=data,
                                        timeout=opts['timeout']) as resp:
                    resp.raise_for_status()
                    data = await resp.json()
                    shark.log.debug('http response', data=data)
                    return data
            except aiohttp.ClientError:
                shark.log.exception('unhandled exception in http_post')
            except asyncio.TimeoutError:
                shark.log.exception('timeout in http_post')
        return {'status': 'error', 'error': c.ERR_SERVICE_UNAVAILABLE}