code: def test_intersection_duplicates(self):
      # GH#38743
      index = IntervalIndex.from_tuples(
          [(1, 2), (1, 2), (2, 3), (3, 4)]
      )
      other = IntervalIndex.from_tuples([(1, 2), (2, 3)])
      expected = IntervalIndex.from_tuples([(1, 2), (2, 3)])
      result = index.intersection(other)
      tm.assert_index_equal(result, expected)
  
file_path: pandas/pandas/tests/indexes/interval/test_setops.py
imports: import numpy
  import pytest
  from pandas import Index, IntervalIndex, Timestamp, interval_range
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestIntervalIndex obj's underlying member method code with example usage: obj.test_intersection_duplicates() without return types