code: def test_disconnected(self):
      with pytest.raises(nx.NetworkXError):
          G = nx.from_edgelist([(0, 1), (2, 3)])
          nx.eulerize(G)
  
imports: import collections
  import pytest
  import networkx
label_desc: Use image node_id 1 for calling the TestEulerize obj's underlying member method code with example usage: obj.test_disconnected() without return types