code: def test_td64_series_astype_object(self):
      tdser = Series(
          ["59 Days", "59 Days", "NaT"], dtype="timedelta64[ns]"
      )
      result = tdser.astype(object)
      assert isinstance(result.iloc[0], timedelta)
      assert result.dtype == np.object_
  
imports: from datetime import datetime, timedelta
  from importlib import reload
  import string
  import sys
  import numpy
  import pytest
  from pandas._libs.tslibs import iNaT
  import pandas.util._test_decorators
  from pandas import NA, Categorical, CategoricalDtype, DatetimeTZDtype, Index, Interval, NaT, Series, Timedelta, Timestamp, cut, date_range, to_datetime
  import pandas._testing
label_desc: Use image node_id 15 for calling the TestAstype obj's underlying member method code with example usage: obj.test_td64_series_astype_object() without return types