code: def test_tuple_union_bug(self, method, expected, sort):
      index1 = Index(
          np.array(
              [(1, "A"), (2, "A"), (1, "B"), (2, "B")],
              dtype=[("num", int), ("let", "S1")],
          )
      )
      index2 = Index(
          np.array(
              [
                  (1, "A"),
                  (2, "A"),
                  (1, "B"),
                  (2, "B"),
                  (1, "C"),
                  (2, "C"),
              ],
              dtype=[("num", int), ("let", "S1")],
          )
      )
  
      result = getattr(index1, method)(index2, sort=sort)
      assert result.ndim == 1
  
      expected = Index(expected)
      tm.assert_index_equal(result, expected)
  
imports: from datetime import datetime
  import numpy
  import pytest
  import pandas
  from pandas import Index, Series
  import pandas._testing
  from pandas.core.algorithms import safe_sort
label_desc: Use image node_id 16 for calling the TestIndexSetOps obj's underlying member method code with example usage: obj.test_tuple_union_bug(method, expected, sort) without return types