code: def test_setop_with_categorical(index_flat, sort, method):
      # MultiIndex tested separately in tests.indexes.multi.test_setops
      index = index_flat
  
      other = index.astype("category")
      exact = "equiv" if isinstance(index, RangeIndex) else True
  
      result = getattr(index, method)(other, sort=sort)
      expected = getattr(index, method)(index, sort=sort)
      tm.assert_index_equal(result, expected, exact=exact)
  
      result = getattr(index, method)(other[:5], sort=sort)
      expected = getattr(index, method)(index[:5], sort=sort)
      tm.assert_index_equal(result, expected, exact=exact)
  
imports: from datetime import datetime
  import operator
  import numpy
  import pytest
  from pandas._libs import lib
  from pandas.core.dtypes.cast import find_common_type
  from pandas import CategoricalDtype, CategoricalIndex, DatetimeTZDtype, Index, MultiIndex, PeriodDtype, RangeIndex, Series, Timestamp
  import pandas._testing
  from pandas.api.types import is_signed_integer_dtype, pandas_dtype
label_desc: Use image node_id 9 for calling a global function with example usage: test_setop_with_categorical(index_flat, sort, method) without return types