code: def test_modify_column_headers(self):
      op = GoogleAnalyticsModifyFileHeadersDataImportOperator(
          storage_bucket=BUCKET,
          storage_name_object=BUCKET_OBJECT_NAME,
          gcp_conn_id=GCP_CONN_ID,
          task_id="test_task",
      )
  
      data = """pagePath,dimension1
  how_to_make_pizza,1
  how_to_make_doughnuts,2
  """
  
      # No modification
      expected_data = """ga:pagePath,ga:dimension1
  how_to_make_pizza,1
  how_to_make_doughnuts,2
  """
  
      with NamedTemporaryFile("w+") as tmp:
          tmp.write(data)
          tmp.flush()
  
          op._modify_column_headers(tmp.name, {})
  
          with open(tmp.name) as f:
              assert expected_data == f.read()
  
      # with modification
      expected_data = """ga:brrr,ga:dimension1
  how_to_make_pizza,1
  how_to_make_doughnuts,2
  """
      with NamedTemporaryFile("w+") as tmp:
          tmp.write(data)
          tmp.flush()
  
          op._modify_column_headers(tmp.name, {"pagePath": "brrr"})
  
          with open(tmp.name) as f:
              assert expected_data == f.read()
  
file_path: airflow/tests/providers/google/marketing_platform/operators/test_analytics.py
imports: from __future__ import annotations
  from tempfile import NamedTemporaryFile
  from unittest import mock
  from airflow.providers.google.marketing_platform.operators.analytics import GoogleAnalyticsDataImportUploadOperator, GoogleAnalyticsDeletePreviousDataUploadsOperator, GoogleAnalyticsGetAdsLinkOperator, GoogleAnalyticsListAccountsOperator, GoogleAnalyticsModifyFileHeadersDataImportOperator, GoogleAnalyticsRetrieveAdsLinksListOperator
label_desc: Use image node_id 1 for calling the TestGoogleAnalyticsModifyFileHeadersDataImportOperator obj's underlying member method code with example usage: obj.test_modify_column_headers() without return types