code: def _supports_accumulation(self, ser, op_name: str) -> bool:
      return op_name in ["cummin", "cummax"]
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  import numpy
  import pytest
  from pandas._libs import Period, iNaT
  from pandas.compat import is_platform_windows
  from pandas.compat.numpy import np_version_gte1p24
  from pandas.core.dtypes.dtypes import PeriodDtype
  import pandas._testing
  from pandas.core.arrays import PeriodArray
  from pandas.tests.extension import base
label_desc: Use image node_id 2 for calling the TestPeriodArray obj's underlying member method code with example usage: obj._supports_accumulation(ser, op_name) and returns: unknown