code: def test_asfreq_datetimeindex_empty(self, frame_or_series):
      # GH#14320
      index = DatetimeIndex(["2016-09-29 11:00"])
      expected = frame_or_series(index=index, dtype=object).asfreq("h")
      result = frame_or_series([3], index=index.copy()).asfreq("h")
      tm.assert_index_equal(expected.index, result.index)
  
imports: from datetime import datetime
  import numpy
  import pytest
  from pandas._libs.tslibs.offsets import MonthEnd
  from pandas import DataFrame, DatetimeIndex, Series, date_range, period_range, to_datetime
  import pandas._testing
  from pandas.tseries import offsets
label_desc: Use image node_id 2 for calling the TestAsFreq obj's underlying member method code with example usage: obj.test_asfreq_datetimeindex_empty(frame_or_series) without return types