code: def test_end(self):
      ti = MagicMock(key="ti_key")
  
      executor = DebugExecutor()
      executor.tasks_to_run = [ti]
      executor.running = {ti.key}
      executor.end()
  
      ti.set_state.assert_called_once_with(State.UPSTREAM_FAILED)
      assert not executor.running
  
file_path: airflow/tests/executors/test_debug_executor.py
imports: from __future__ import annotations
  from unittest import mock
  from unittest.mock import MagicMock
  from airflow.executors.debug_executor import DebugExecutor
  from airflow.utils.state import State
label_desc: Use image node_id 5 for calling the TestDebugExecutor obj's underlying member method code with example usage: obj.test_end() without return types