code: def test_replace_naive(self):
      # GH#14621, GH#7825
      ts = Timestamp("2016-01-01 09:00:00")
      result = ts.replace(hour=0)
      expected = Timestamp("2016-01-01 00:00:00")
      assert result == expected
  
imports: from datetime import datetime
  from dateutil.tz import gettz
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs import OutOfBoundsDatetime, Timestamp, conversion
  from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
  import pandas.util._test_decorators
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestTimestampReplace obj's underlying member method code with example usage: obj.test_replace_naive() without return types