code: def test_reorder_categories(self):
      cat = Categorical(["a", "b", "c", "a"], ordered=True)
      old = cat.copy()
      new = Categorical(
          ["a", "b", "c", "a"], categories=["c", "b", "a"], ordered=True
      )
  
      res = cat.reorder_categories(["c", "b", "a"])
      # cat must be the same as before
      tm.assert_categorical_equal(cat, old)
      # only res is changed
      tm.assert_categorical_equal(res, new)
  
imports: import re
  import numpy
  import pytest
  from pandas.compat import PY311
  from pandas import Categorical, CategoricalIndex, DataFrame, Index, Series, StringDtype
  import pandas._testing
  from pandas.core.arrays.categorical import recode_for_categories
label_desc: Use image node_id 8 for calling the TestCategoricalAPI obj's underlying member method code with example usage: obj.test_reorder_categories() without return types