code: def test_string_index(testlist):
      index = cudf.Index(testlist)
      index_pd = pd.Index(testlist)
  
      assert index.is_unique == index_pd.is_unique
      with pytest.warns(FutureWarning):
          expect = index_pd.is_monotonic
      with pytest.warns(FutureWarning):
          got = index.is_monotonic
      assert got == expect
      assert (
          index.is_monotonic_increasing
          == index_pd.is_monotonic_increasing
      )
      assert (
          index.is_monotonic_decreasing
          == index_pd.is_monotonic_decreasing
      )
  
imports: import numpy
  import pandas
  import pytest
  import cudf
  from cudf import Index, MultiIndex, Series
  from cudf.core.index import CategoricalIndex, DatetimeIndex, GenericIndex, RangeIndex
  from cudf.testing._utils import assert_eq, expect_warning_if
label_desc: Use image node_id 3 for calling a global function with example usage: test_string_index(testlist) without return types