code: def setup_mock_kms(region, alias):
      client = boto3.client("kms", region_name=region)
      response = client.create_key()
      client.create_alias(
          AliasName=alias, TargetKeyId=response["KeyMetadata"]["KeyId"]
      )
  
file_path: streamalert/tests/unit/streamalert/alert_processor/helpers.py
imports: import random
  import boto3
  from streamalert.alert_processor.outputs.credentials.provider import LocalFileDriver
  from streamalert.shared.alert import Alert
  from streamalert.shared.helpers.aws_api_client import AwsKms, AwsSsm
label_desc: Use image node_id 4 for calling a global function with example usage: setup_mock_kms(region, alias) without return types