class_docstr: A trigger that always errors immediately.
  
  Should only be used for testing.
code: def serialize(self) -> tuple[str, dict[str, Any]]:
      return ("airflow.triggers.testing.FailureTrigger", {})
  
file_path: airflow/airflow/triggers/testing.py
imports: from __future__ import annotations
  from typing import Any
  from airflow.triggers.base import BaseTrigger, TriggerEvent
label_desc: Use image node_id 1 for calling the FailureTrigger obj's underlying member method code with example usage: obj.serialize() and returns: str,  dict