code: def test_eulerian_path(self):
      x = [(4, 0), (0, 1), (1, 2), (2, 0)]
      for e1, e2 in zip(x, nx.eulerian_path(nx.DiGraph(x))):
          assert e1 == e2
  
imports: import collections
  import pytest
  import networkx
label_desc: Use image node_id 1 for calling the TestEulerianPath obj's underlying member method code with example usage: obj.test_eulerian_path() without return types