code: def test_astype_object(self, dta):
      result = dta.astype(object)
      assert all(x._creso == dta._creso for x in result)
      assert all(x == y for x, y in zip(result, dta))
  
imports: from __future__ import annotations
  from datetime import timedelta
  import operator
  import numpy
  import pytest
  from pandas._libs.tslibs import tz_compare
  from pandas.core.dtypes.dtypes import DatetimeTZDtype
  import pandas
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, TimedeltaArray
label_desc: Use image node_id 12 for calling the TestNonNano obj's underlying member method code with example usage: obj.test_astype_object(dta) without return types