code: def test_constructor(self):
      operator = CloudDataTransferServiceS3ToGCSOperator(
          task_id=TASK_ID,
          s3_bucket=AWS_BUCKET_NAME,
          gcs_bucket=GCS_BUCKET_NAME,
          project_id=GCP_PROJECT_ID,
          description=DESCRIPTION,
          schedule=SCHEDULE_DICT,
      )
  
      assert operator.task_id == TASK_ID
      assert operator.s3_bucket == AWS_BUCKET_NAME
      assert operator.gcs_bucket == GCS_BUCKET_NAME
      assert operator.project_id == GCP_PROJECT_ID
      assert operator.description == DESCRIPTION
      assert operator.schedule == SCHEDULE_DICT
  
imports: from __future__ import annotations
  from copy import deepcopy
  from datetime import date, time
  from unittest import mock
  import pytest
  import time_machine
  from botocore.credentials import Credentials
  from airflow.exceptions import AirflowException
  from airflow.providers.google.cloud.hooks.cloud_storage_transfer_service import ACCESS_KEY_ID, AWS_ACCESS_KEY, AWS_S3_DATA_SOURCE, BUCKET_NAME, FILTER_JOB_NAMES, GCS_DATA_SINK, GCS_DATA_SOURCE, HTTP_DATA_SOURCE, LIST_URL, NAME, PATH, SCHEDULE, SCHEDULE_END_DATE, SCHEDULE_START_DATE, SECRET_ACCESS_KEY, START_TIME_OF_DAY, STATUS, TRANSFER_SPEC
  from airflow.providers.google.cloud.operators.cloud_storage_transfer_service import CloudDataTransferServiceCancelOperationOperator, CloudDataTransferServiceCreateJobOperator, CloudDataTransferServiceDeleteJobOperator, CloudDataTransferServiceGCSToGCSOperator, CloudDataTransferServiceGetOperationOperator, CloudDataTransferServiceListOperationsOperator, CloudDataTransferServicePauseOperationOperator, CloudDataTransferServiceResumeOperationOperator, CloudDataTransferServiceS3ToGCSOperator, CloudDataTransferServiceUpdateJobOperator, TransferJobPreprocessor, TransferJobValidator
  from airflow.utils import timezone
label_desc: Use image node_id 1 for calling the TestS3ToGoogleCloudStorageTransferOperator obj's underlying member method code with example usage: obj.test_constructor() without return types