code: def test_has_duplicates(self, index):
      assert index.is_unique
      assert not index.has_duplicates
  
imports: import numpy
  import pytest
  from pandas.core.dtypes.common import ensure_platform_int
  import pandas
  from pandas import Index, RangeIndex
  import pandas._testing
label_desc: Use image node_id 31 for calling the TestRangeIndex obj's underlying member method code with example usage: obj.test_has_duplicates(index) without return types