code: def test_download_mail_attachments_with_mail_filter(
      self, mock_imaplib, mock_open_method
  ):
      _create_fake_imap(mock_imaplib, with_mail=True)
      mail_filter = '(SINCE "01-Jan-2019")'
  
      with ImapHook() as imap_hook:
          imap_hook.download_mail_attachments(
              name="test1.csv",
              local_output_directory="test_directory",
              mail_filter=mail_filter,
          )
  
      mock_imaplib.IMAP4_SSL.return_value.search.assert_called_once_with(
          None, mail_filter
      )
      assert mock_open_method.call_count == 1
  
imports: from __future__ import annotations
  import imaplib
  import json
  from unittest.mock import Mock, mock_open, patch
  import pytest
  from airflow.exceptions import AirflowException
  from airflow.models import Connection
  from airflow.providers.imap.hooks.imap import ImapHook
  from airflow.utils import db
  from tests.test_utils.config import conf_vars
label_desc: Use image node_id 27 for calling the TestImapHook obj's underlying member method code with example usage: obj.test_download_mail_attachments_with_mail_filter(mock_imaplib, mock_open_method) without return types