code: def test_date_range_localize(self, unit):
      rng = date_range(
          "3/11/2012 03:00",
          periods=15,
          freq="h",
          tz="US/Eastern",
          unit=unit,
      )
      rng2 = DatetimeIndex(
          ["3/11/2012 03:00", "3/11/2012 04:00"],
          dtype=f"M8[{unit}, US/Eastern]",
      )
      rng3 = date_range(
          "3/11/2012 03:00", periods=15, freq="h", unit=unit
      )
      rng3 = rng3.tz_localize("US/Eastern")
  
      tm.assert_index_equal(rng._with_freq(None), rng3)
  
      # DST transition time
      val = rng[0]
      exp = Timestamp("3/11/2012 03:00", tz="US/Eastern")
  
      assert val.hour == 3
      assert exp.hour == 3
      assert val == exp  # same UTC value
      tm.assert_index_equal(rng[:2], rng2)
  
imports: from datetime import datetime, timedelta, timezone, tzinfo
  from dateutil.tz import gettz
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs import conversion, timezones
  import pandas
  from pandas import DatetimeIndex, Timestamp, bdate_range, date_range, isna, to_datetime
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestDatetimeIndexTimezones obj's underlying member method code with example usage: obj.test_date_range_localize(unit) without return types