code: def test_setop_with_categorical(idx, sort, method):
      other = idx.to_flat_index().astype("category")
      res_names = [None] * idx.nlevels
  
      result = getattr(idx, method)(other, sort=sort)
      expected = getattr(idx, method)(idx, sort=sort).rename(res_names)
      tm.assert_index_equal(result, expected)
  
      result = getattr(idx, method)(other[:5], sort=sort)
      expected = getattr(idx, method)(idx[:5], sort=sort).rename(
          res_names
      )
      tm.assert_index_equal(result, expected)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import CategoricalIndex, DataFrame, Index, IntervalIndex, MultiIndex, Series
  import pandas._testing
  from pandas.api.types import is_float_dtype, is_unsigned_integer_dtype
label_desc: Use image node_id 16 for calling a global function with example usage: test_setop_with_categorical(idx, sort, method) without return types