code: def test_set_bucket_name(
      self,
      mock_hook,
      mock_gcs_hook,
      mock_temp,
      mock_request,
      mock_shutil,
      test_bucket_name,
  ):
      mock_temp.NamedTemporaryFile.return_value.__enter__.return_value.name = (
          FILENAME
      )
      mock_hook.return_value.get_report.return_value = {
          "metadata": {
              "status": {"state": "DONE"},
              "googleCloudStoragePath": "TEST",
          }
      }
  
      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 = GoogleDisplayVideo360DownloadReportV2Operator(
          query_id=QUERY_ID,
          report_id=REPORT_ID,
          bucket_name=test_bucket_name
          if test_bucket_name != "XComArg"
          else taskflow_op,
          report_name=REPORT_NAME,
          task_id="test_task",
          dag=dag,
      )
      op.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
  
      mock_gcs_hook.return_value.upload.assert_called_once_with(
          bucket_name=BUCKET_NAME,
          filename=FILENAME,
          gzip=True,
          mime_type="text/csv",
          object_name=REPORT_NAME + ".gz",
      )
  
imports: from __future__ import annotations
  import json
  from tempfile import NamedTemporaryFile
  from unittest import mock
  import pytest
  from airflow.exceptions import AirflowException
  from airflow.models import DAG, TaskInstance
  from airflow.providers.google.marketing_platform.operators.display_video import GoogleDisplayVideo360CreateQueryOperator, GoogleDisplayVideo360CreateSDFDownloadTaskOperator, GoogleDisplayVideo360DeleteReportOperator, GoogleDisplayVideo360DownloadLineItemsOperator, GoogleDisplayVideo360DownloadReportV2Operator, GoogleDisplayVideo360RunQueryOperator, GoogleDisplayVideo360SDFtoGCSOperator, GoogleDisplayVideo360UploadLineItemsOperator
  from airflow.utils import timezone
  from airflow.utils.session import create_session
label_desc: Use image node_id 4 for calling the TestGoogleDisplayVideo360DownloadReportV2Operator obj's underlying member method code with example usage: obj.test_set_bucket_name(mock_hook, mock_gcs_hook, mock_temp, mock_request, mock_shutil, test_bucket_name) and returns: BUCKET_NAME