code: def test_on_non_eulerian_graph(self):
      G = nx.cycle_graph(18)
      G.add_edge(0, 18)
      G.add_edge(18, 19)
      G.add_edge(17, 19)
      G.add_edge(4, 20)
      G.add_edge(20, 21)
      G.add_edge(21, 22)
      G.add_edge(22, 23)
      G.add_edge(23, 24)
      G.add_edge(24, 25)
      G.add_edge(25, 26)
      G.add_edge(26, 27)
      G.add_edge(27, 28)
      G.add_edge(28, 13)
      assert not nx.is_eulerian(G)
      G = nx.eulerize(G)
      assert nx.is_eulerian(G)
      assert nx.number_of_edges(G) == 39
  
imports: import collections
  import pytest
  import networkx
label_desc: Use image node_id 8 for calling the TestEulerize obj's underlying member method code with example usage: obj.test_on_non_eulerian_graph() without return types