code: def test_impossible_things(self):
      G = nx.karate_club_graph()
      disp = nx.dispersion(G)
      for u in disp:
          for v in disp[u]:
              assert disp[u][v] >= 0
  
imports: import networkx
label_desc: Use image node_id 4 for calling the TestDispersion obj's underlying member method code with example usage: obj.test_impossible_things() without return types