docstr: Helper which create fake task_instance
docstr_tok: ["Helper","which","create","fake","task_instance"]
code: def _get_task_instance(self, state, *, map_index=-1):
      """Helper which create fake task_instance"""
      ti = self.ti_maker(
          dag_id=self.dag_id,
          task_id=self.task_id,
          run_id=self.run_id,
          execution_date=DEFAULT_DATE,
          map_index=map_index,
          state=state,
      )
      ti.task.reschedule = True
      return ti
  
imports: from __future__ import annotations
  from datetime import timedelta
  from unittest.mock import patch
  import pytest
  import time_machine
  from slugify import slugify
  from airflow.models.taskreschedule import TaskReschedule
  from airflow.ti_deps.dep_context import DepContext
  from airflow.ti_deps.deps.ready_to_reschedule import ReadyToRescheduleDep
  from airflow.utils import timezone
  from airflow.utils.session import create_session
  from airflow.utils.state import State
  from tests.test_utils import db
label_desc: Use image node_id 2 for calling the TestNotInReschedulePeriodDep obj's underlying member method code with example usage: obj._get_task_instance(state) and returns: ti