code: def test_create_dispatcher():
      """StreamAlertOutput - Create Dispatcher"""
      dispatcher = StreamAlertOutput.create_dispatcher("aws-s3", CONFIG)
      assert_is_instance(dispatcher, S3Output)
  
imports: from mock import Mock, patch, MagicMock
  from moto import mock_kms, mock_ssm
  from nose.tools import assert_equal, assert_is_instance, assert_is_not_none, assert_is_none, assert_count_equal
  from requests.exceptions import Timeout
  from streamalert.alert_processor.outputs.output_base import OutputDispatcher, OutputProperty, OutputRequestFailure, StreamAlertOutput
  from streamalert.alert_processor.outputs.aws import S3Output
  from tests.unit.streamalert.alert_processor import CONFIG, KMS_ALIAS, MOCK_ENV, REGION, PREFIX
  from tests.unit.streamalert.alert_processor.helpers import put_mock_ssm_parameters
label_desc: Use image node_id 4 for calling a global function with example usage: test_create_dispatcher() without return types