code: def test_all_triads():
      """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 = [G.subgraph(x.split(",")) for x in expected]
      actual = list(nx.all_triads(G))
      assert all(
          any(nx.is_isomorphic(G1, G2) for G1 in expected)
          for G2 in actual
      )
  
imports: import itertools
  from collections import defaultdict
  from random import sample
  import pytest
  import networkx
label_desc: Use image node_id 6 for calling a global function with example usage: test_all_triads() without return types