code: def test_from_categorical(self):
      tdi = timedelta_range(1, periods=5)
  
      cat = pd.Categorical(tdi)
  
      result = TimedeltaIndex(cat)
      tm.assert_index_equal(result, tdi)
  
      ci = pd.CategoricalIndex(tdi)
      result = TimedeltaIndex(ci)
      tm.assert_index_equal(result, tdi)
  
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 19 for calling the TestTimedeltaIndex obj's underlying member method code with example usage: obj.test_from_categorical() without return types