code: def test_timedelta_range_infer_freq(self):
      # https://github.com/pandas-dev/pandas/issues/35897
      result = timedelta_range("0s", "1s", periods=31)
      assert result.freq is None
  
file_path: pandas/pandas/tests/indexes/timedeltas/test_timedelta_range.py
imports: import numpy
  import pytest
  from pandas import Timedelta, TimedeltaIndex, timedelta_range, to_timedelta
  import pandas._testing
  from pandas.tseries.offsets import Day, Second
label_desc: Use image node_id 8 for calling the TestTimedeltas obj's underlying member method code with example usage: obj.test_timedelta_range_infer_freq() without return types