code: def test_view_pygraphviz(self):
      G = nx.Graph()  # "An empty graph cannot be drawn."
      pytest.raises(
          nx.NetworkXException, nx.nx_agraph.view_pygraphviz, G
      )
      G = nx.barbell_graph(4, 6)
      nx.nx_agraph.view_pygraphviz(G, show=False)
  
imports: import warnings
  import pytest
  import networkx
  from networkx.utils import edges_equal, graphs_equal, nodes_equal
label_desc: Use image node_id 11 for calling the TestAGraph obj's underlying member method code with example usage: obj.test_view_pygraphviz() without return types