code: def test_on_eulerian(self):
      G = nx.cycle_graph(3)
      H = nx.eulerize(G)
      assert nx.is_isomorphic(G, H)
  
imports: import collections
  import pytest
  import networkx
label_desc: Use image node_id 5 for calling the TestEulerize obj's underlying member method code with example usage: obj.test_on_eulerian() without return types