code: def test_subgraph_todirected(self):
      SG = nx.induced_subgraph(self.G, [4, 5, 6])
      SSG = SG.to_directed()
      assert sorted(SSG) == [4, 5, 6]
      assert sorted(SSG.edges) == [(4, 5), (5, 4), (5, 6), (6, 5)]
  
imports: import pytest
  import networkx
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 6 for calling the TestChainsOfViews obj's underlying member method code with example usage: obj.test_subgraph_todirected() without return types