code: def test_setitem(self):
      factor = Categorical(
          ["a", "b", "b", "a", "a", "c", "c", "c"], ordered=True
      )
      # int/positional
      c = factor.copy()
      c[0] = "b"
      assert c[0] == "b"
      c[-1] = "a"
      assert c[-1] == "a"
  
      # boolean
      c = factor.copy()
      indexer = np.zeros(len(c), dtype="bool")
      indexer[0] = True
      indexer[-1] = True
      c[indexer] = "c"
      expected = Categorical(
          ["c", "b", "b", "a", "a", "c", "c", "c"], ordered=True
      )
  
      tm.assert_categorical_equal(c, expected)
  
imports: import math
  import numpy
  import pytest
  from pandas import NA, Categorical, CategoricalIndex, Index, Interval, IntervalIndex, NaT, PeriodIndex, Series, Timedelta, Timestamp
  import pandas._testing
  import pandas.core.common
label_desc: Use image node_id 2 for calling the TestCategoricalIndexingWithFactor obj's underlying member method code with example usage: obj.test_setitem() without return types