code: def test_all_triplets():
      """Tests the all_triplets function."""
      G = nx.DiGraph()
      G.add_edges_from(
          ["01", "02", "03", "04", "05", "12", "16", "51", "56", "65"]
      )
      expected = [
          f"{i},{j},{k}"
          for i in range(7)
          for j in range(i + 1, 7)
          for k in range(j + 1, 7)
      ]
      expected = [set(x.split(",")) for x in expected]
      actual = [set(x) for x in nx.all_triplets(G)]
      assert all(any(s1 == s2 for s1 in expected) for s2 in actual)
  
imports: import itertools
  from collections import defaultdict
  from random import sample
  import pytest
  import networkx
label_desc: Use image node_id 5 for calling a global function with example usage: test_all_triplets() without return types