code: def test_set_index(self, float_string_frame):
      df = float_string_frame
      idx = Index(np.arange(len(df))[::-1])
  
      df = df.set_index(idx)
      tm.assert_index_equal(df.index, idx)
      with pytest.raises(ValueError, match="Length mismatch"):
          df.set_index(idx[::2])
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import Categorical, CategoricalIndex, DataFrame, DatetimeIndex, Index, MultiIndex, Series, date_range, period_range, to_datetime
  import pandas._testing
label_desc: Use image node_id 8 for calling the TestSetIndex obj's underlying member method code with example usage: obj.test_set_index(float_string_frame) without return types