code: def test_loops_larger(self):
      # from
      # http://ecee.colorado.edu/~waite/Darmstadt/motion.html
      g = nx.DiGraph()
      edges = [
          ("entry", "exit"),
          ("entry", "1"),
          ("1", "2"),
          ("2", "3"),
          ("3", "4"),
          ("4", "5"),
          ("5", "6"),
          ("6", "exit"),
          ("6", "2"),
          ("5", "3"),
          ("4", "4"),
      ]
  
      g.add_edges_from(edges)
      df = nx.dominance_frontiers(g, "entry")
      answer = {
          "entry": set(),
          "1": {"exit"},
          "2": {"exit", "2"},
          "3": {"exit", "3", "2"},
          "4": {"exit", "4", "3", "2"},
          "5": {"exit", "3", "2"},
          "6": {"exit", "2"},
          "exit": set(),
      }
      for n in df:
          assert set(df[n]) == set(answer[n])
  
imports: import pytest
  import networkx
label_desc: Use image node_id 13 for calling the TestDominanceFrontiers obj's underlying member method code with example usage: obj.test_loops_larger() without return types