code: def test_delete_files(self, sftp_hook):
      sftp_mock = sftp_hook.return_value
  
      operator = SFTPToWasbOperator(
          task_id=TASK_ID,
          sftp_source_path=SOURCE_PATH_NO_WILDCARD,
          sftp_conn_id=SFTP_CONN_ID,
          container_name=CONTAINER_NAME,
          wasb_conn_id=WASB_CONN_ID,
          move_object=True,
      )
  
      sftp_file_paths = EXPECTED_FILES
      operator.delete_files(sftp_file_paths)
  
      sftp_mock.delete_file.assert_has_calls(
          [mock.call(EXPECTED_FILES[0])]
      )
  
file_path: airflow/tests/providers/microsoft/azure/transfers/test_sftp_to_wasb.py
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.exceptions import AirflowException
  from airflow.providers.microsoft.azure.transfers.sftp_to_wasb import SftpFile, SFTPToWasbOperator
label_desc: Use image node_id 9 for calling the TestSFTPToWasbOperator obj's underlying member method code with example usage: obj.test_delete_files(sftp_hook) without return types