def METHOD_NAME(self):
    self.http_stubber.add_response(body=self.s3_response_body)
    with self.http_stubber:
        self.client.list_buckets()
    api_call_events = self._get_all_events_of_type('API_CALL')
    self.assertEqual(len(api_call_events), 1)
    event = api_call_events[0]
    event_type, payload, source = event
    self.assertEqual(
        payload,
        {'operation': 'ListBuckets', 'params': {}, 'service': 's3'},
    )
    self.assertEqual(source, 'BOTOCORE')