code: def test_subgraph(self):
      assert (
          self.G.subgraph([0, 1, 2, 4]).adj
          == nx.subgraph(self.G, [0, 1, 2, 4]).adj
      )
      assert (
          self.DG.subgraph([0, 1, 2, 4]).adj
          == nx.subgraph(self.DG, [0, 1, 2, 4]).adj
      )
      assert (
          self.G.subgraph([0, 1, 2, 4]).adj
          == nx.induced_subgraph(self.G, [0, 1, 2, 4]).adj
      )
      assert (
          self.DG.subgraph([0, 1, 2, 4]).adj
          == nx.induced_subgraph(self.DG, [0, 1, 2, 4]).adj
      )
      # subgraph-subgraph chain is allowed in function interface
      H = nx.induced_subgraph(self.G.subgraph([0, 1, 2, 4]), [0, 1, 4])
      assert H._graph is not self.G
      assert H.adj == self.G.subgraph([0, 1, 4]).adj
  
imports: import random
  import pytest
  import networkx
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 12 for calling the TestFunction obj's underlying member method code with example usage: obj.test_subgraph() without return types