code: def test_astype_to_same(self):
      arr = DatetimeArray._from_sequence(
          ["2000"], dtype=DatetimeTZDtype(tz="US/Central")
      )
      result = arr.astype(DatetimeTZDtype(tz="US/Central"), copy=False)
      assert result is arr
  
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 4 for calling the TestDatetimeArray obj's underlying member method code with example usage: obj.test_astype_to_same() without return types