code: def test_asfreq_normalize(self, frame_or_series):
      rng = date_range("1/1/2000 09:30", periods=20)
      norm = date_range("1/1/2000", periods=20)
  
      vals = np.random.default_rng(2).standard_normal((20, 3))
  
      obj = DataFrame(vals, index=rng)
      expected = DataFrame(vals, index=norm)
      if frame_or_series is Series:
          obj = obj[0]
          expected = expected[0]
  
      result = obj.asfreq("D", normalize=True)
      tm.assert_equal(result, expected)
  
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 4 for calling the TestAsFreq obj's underlying member method code with example usage: obj.test_asfreq_normalize(frame_or_series) without return types