code: def test_sort_index_name(self, datetime_series):
      result = datetime_series.sort_index(ascending=False)
      assert result.name == datetime_series.name
  
imports: import numpy
  import pytest
  from pandas import DatetimeIndex, IntervalIndex, MultiIndex, Series
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestSeriesSortIndex obj's underlying member method code with example usage: obj.test_sort_index_name(datetime_series) without return types