code: def test_set_bucket_name(
      self,
      gcs_hook_mock,
      hook_mock,
      tempfile_mock,
      http_mock,
      test_bucket_name,
  ):
      http_mock.MediaIoBaseDownload.return_value.next_chunk.return_value = (
          None,
          True,
      )
      tempfile_mock.NamedTemporaryFile.return_value.__enter__.return_value.name = (
          TEMP_FILE_NAME
      )
  
      dag = DAG(
          dag_id="test_set_bucket_name",
          start_date=DEFAULT_DATE,
          schedule=None,
          catchup=False,
      )
  
      if BUCKET_NAME not in test_bucket_name:
  
          @dag.task
          def f():
              return BUCKET_NAME
  
          taskflow_op = f()
          taskflow_op.operator.run(
              start_date=DEFAULT_DATE, end_date=DEFAULT_DATE
          )
  
      op = GoogleCampaignManagerDownloadReportOperator(
          profile_id=PROFILE_ID,
          report_id=REPORT_ID,
          file_id=FILE_ID,
          bucket_name=test_bucket_name
          if test_bucket_name != "XComArg"
          else taskflow_op,
          report_name=REPORT_NAME,
          api_version=API_VERSION,
          task_id="test_task",
          dag=dag,
      )
      op.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
  
      gcs_hook_mock.return_value.upload.assert_called_once_with(
          bucket_name=BUCKET_NAME,
          object_name=REPORT_NAME + ".gz",
          gzip=True,
          filename=TEMP_FILE_NAME,
          mime_type="text/csv",
      )
  
imports: from __future__ import annotations
  import json
  from tempfile import NamedTemporaryFile
  from unittest import mock
  import pytest
  from airflow.models import DAG, TaskInstance
  from airflow.providers.google.marketing_platform.operators.campaign_manager import GoogleCampaignManagerBatchInsertConversionsOperator, GoogleCampaignManagerBatchUpdateConversionsOperator, GoogleCampaignManagerDeleteReportOperator, GoogleCampaignManagerDownloadReportOperator, GoogleCampaignManagerInsertReportOperator, GoogleCampaignManagerRunReportOperator
  from airflow.utils import timezone
  from airflow.utils.session import create_session
label_desc: Use image node_id 4 for calling the TestGoogleCampaignManagerDownloadReportOperator obj's underlying member method code with example usage: obj.test_set_bucket_name(gcs_hook_mock, hook_mock, tempfile_mock, http_mock, test_bucket_name) and returns: BUCKET_NAME