code: def test_explicit_none_freq(self):
      # Explicitly passing freq=None is respected
      tdi = timedelta_range(1, periods=5)
      assert tdi.freq is not None
  
      result = TimedeltaIndex(tdi, freq=None)
      assert result.freq is None
  
      result = TimedeltaIndex(tdi._data, freq=None)
      assert result.freq is None
  
      msg = "TimedeltaArray.__init__ is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          tda = TimedeltaArray(tdi, freq=None)
      assert tda.freq is None
  
imports: from datetime import timedelta
  import numpy
  import pytest
  import pandas
  from pandas import Timedelta, TimedeltaIndex, timedelta_range, to_timedelta
  import pandas._testing
  from pandas.core.arrays.timedeltas import TimedeltaArray
label_desc: Use image node_id 18 for calling the TestTimedeltaIndex obj's underlying member method code with example usage: obj.test_explicit_none_freq() without return types