code: def test_astype_dt64tz_to_str(self):
      # GH#10442 : testing astype(str) is correct for Series/DatetimeIndex
      dti_tz = date_range("2012-01-01", periods=3, tz="US/Eastern")
      result = Series(dti_tz).astype(str)
      expected = Series(
          [
              "2012-01-01 00:00:00-05:00",
              "2012-01-02 00:00:00-05:00",
              "2012-01-03 00:00:00-05:00",
          ],
          dtype=object,
      )
      tm.assert_series_equal(result, expected)
  
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 9 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_dt64tz_to_str() without return types