code: def test_notifier_call_with_prepared_context(self, dag_maker, caplog):
      with dag_maker("test_render_message_with_template_works"):
          EmptyOperator(task_id="test_id")
      notifier = MockNotifier(message="task: {{ task_list[0] }}")
      notifier.notify = MagicMock()
      notifier(None, ["some_task"], None, None, None)
      notifier.notify.assert_called_once_with(
          {
              "dag": None,
              "task_list": ["some_task"],
              "blocking_task_list": None,
              "slas": None,
              "blocking_tis": None,
              "message": "task: {{ task_list[0] }}",
          }
      )
      assert notifier.message == "task: some_task"
  
file_path: airflow/tests/notifications/test_basenotifier.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  from unittest.mock import MagicMock
  import jinja2
  import pytest
  from airflow.notifications.basenotifier import BaseNotifier
  from airflow.operators.empty import EmptyOperator
label_desc: Use image node_id 5 for calling the TestBaseNotifier obj's underlying member method code with example usage: obj.test_notifier_call_with_prepared_context(dag_maker, caplog) without return types