code: def test_setslice(datetime_series):
      sl = datetime_series[5:20]
      assert len(sl) == len(sl.index)
      assert sl.index.is_unique is True
  
imports: from datetime import timedelta
  import re
  import numpy
  import pytest
  from pandas.errors import IndexingError
  from pandas import NA, DataFrame, Index, IndexSlice, MultiIndex, NaT, Series, Timedelta, Timestamp, concat, date_range, isna, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 15 for calling a global function with example usage: test_setslice(datetime_series) without return types