code: def test_3d_layout(self):
      G = nx.Graph()
      G = self.build_graph(G)
      G.graph["dimen"] = 3
      pos = nx.nx_agraph.pygraphviz_layout(G, prog="neato")
      pos = list(pos.values())
      assert len(pos) == 5
      assert len(pos[0]) == 3
  
imports: import warnings
  import pytest
  import networkx
  from networkx.utils import edges_equal, graphs_equal, nodes_equal
label_desc: Use image node_id 24 for calling the TestAGraph obj's underlying member method code with example usage: obj.test_3d_layout() without return types