code: def test_notarborescence2():
      # Not an arborescence due to in-degree violation.
      G = nx.MultiDiGraph()
      nx.add_path(G, range(5))
      G.add_edge(6, 4)
      assert not nx.is_branching(G)
      assert not nx.is_arborescence(G)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 10 for calling a global function with example usage: test_notarborescence2() without return types