code: def test_on_empty_graph(self):
      with pytest.raises(nx.NetworkXError):
          nx.eulerize(nx.empty_graph(3))
  
imports: import collections
  import pytest
  import networkx
label_desc: Use image node_id 4 for calling the TestEulerize obj's underlying member method code with example usage: obj.test_on_empty_graph() without return types