code: def test_getitem(self, tz):
      idx = date_range(
          "2011-01-01", "2011-01-31", freq="D", tz=tz, name="idx"
      )
  
      result = idx[0]
      assert result == Timestamp("2011-01-01", tz=idx.tz)
  
      result = idx[0:5]
      expected = date_range(
          "2011-01-01", "2011-01-05", freq="D", tz=idx.tz, name="idx"
      )
      tm.assert_index_equal(result, expected)
      assert result.freq == expected.freq
  
      result = idx[0:10:2]
      expected = date_range(
          "2011-01-01", "2011-01-09", freq="2D", tz=idx.tz, name="idx"
      )
      tm.assert_index_equal(result, expected)
      assert result.freq == expected.freq
  
      result = idx[-20:-5:3]
      expected = date_range(
          "2011-01-12", "2011-01-24", freq="3D", tz=idx.tz, name="idx"
      )
      tm.assert_index_equal(result, expected)
      assert result.freq == expected.freq
  
      result = idx[4::-1]
      expected = DatetimeIndex(
          [
              "2011-01-05",
              "2011-01-04",
              "2011-01-03",
              "2011-01-02",
              "2011-01-01",
          ],
          dtype=idx.dtype,
          freq="-1D",
          name="idx",
      )
      tm.assert_index_equal(result, expected)
      assert result.freq == expected.freq
  
imports: from datetime import date, datetime, time, timedelta
  import numpy
  import pytest
  from pandas._libs import index
  from pandas.compat.numpy import np_long
  import pandas
  from pandas import DatetimeIndex, Index, Timestamp, bdate_range, date_range, notna
  import pandas._testing
  from pandas.tseries.frequencies import to_offset
label_desc: Use image node_id 2 for calling the TestGetItem obj's underlying member method code with example usage: obj.test_getitem(tz) without return types