code: def test_get_indexer_non_monotonic(self):
      # GH 16410
      idx1 = IntervalIndex.from_tuples([(2, 3), (4, 5), (0, 1)])
      idx2 = IntervalIndex.from_tuples([(0, 1), (2, 3), (6, 7), (8, 9)])
      result = idx1.get_indexer(idx2)
      expected = np.array([2, 0, -1, -1], dtype=np.intp)
      tm.assert_numpy_array_equal(result, expected)
  
      result = idx1.get_indexer(idx1[1:])
      expected = np.array([1, 2], dtype=np.intp)
      tm.assert_numpy_array_equal(result, expected)
  
imports: import re
  import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, CategoricalIndex, DatetimeIndex, Index, Interval, IntervalIndex, MultiIndex, NaT, Timedelta, Timestamp, array, date_range, interval_range, isna, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 10 for calling the TestGetIndexer obj's underlying member method code with example usage: obj.test_get_indexer_non_monotonic() without return types