code: def test__get_unique_ordered_tuples():
      non_unique_pairs = [
          ("1", "3"),
          ("1", "4"),
          ("3", "1"),
          ("1", "3"),
          ("3", "4"),
      ]
      obtained_unique_ordered_pairs = _get_unique_ordered_tuples(
          non_unique_pairs
      )
  
      # test order
      for i in obtained_unique_ordered_pairs:
          assert i[0] <= i[1]
  
      # test membership
      set_list = []
      for j in obtained_unique_ordered_pairs:
          if set(j) not in set_list:
              set_list.append(set(j))
      assert len(set_list) == 3
  
file_path: imagededup/tests/test_classification.py
imports: import numpy
  from imagededup.handlers.metrics.classification import _get_unique_ordered_tuples, _make_all_unique_possible_pairs, _make_positive_duplicate_pairs, _prepare_labels, classification_metrics
label_desc: Use image node_id 1 for calling a global function with example usage: test__get_unique_ordered_tuples() without return types