code: def test_notarborescence1():
      # Not an arborescence due to not spanning.
      G = nx.MultiDiGraph()
      G.add_nodes_from(range(10))
      G.add_edges_from([(0, 1), (0, 2), (1, 3), (5, 6)])
      assert nx.is_branching(G)
      assert not nx.is_arborescence(G)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 9 for calling a global function with example usage: test_notarborescence1() without return types