code: def test_mergesort_descending_stability(self):
      # GH 28697
      s = Series([1, 2, 1, 3], ["first", "b", "second", "c"])
      result = s.sort_values(ascending=False, kind="mergesort")
      expected = Series([3, 2, 1, 1], ["c", "b", "first", "second"])
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/series/methods/test_sort_values.py
imports: import numpy
  import pytest
  from pandas import Categorical, DataFrame, Series
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestSeriesSortValues obj's underlying member method code with example usage: obj.test_mergesort_descending_stability() without return types