code: def test_all_pairs_lca_non_dags(self):
      pytest.raises(
          nx.NetworkXError, all_pairs_lca, nx.DiGraph([(3, 4), (4, 3)])
      )
  
imports: from itertools import chain, combinations, product
  import pytest
  import networkx
label_desc: Use image node_id 10 for calling the TestDAGLCA obj's underlying member method code with example usage: obj.test_all_pairs_lca_non_dags() without return types