code: def test_graph_edit_distance_roots_and_timeout(self):
      G0 = nx.star_graph(5)
      G1 = G0.copy()
      pytest.raises(ValueError, graph_edit_distance, G0, G1, roots=[2])
      pytest.raises(
          ValueError, graph_edit_distance, G0, G1, roots=[2, 3, 4]
      )
      pytest.raises(
          nx.NodeNotFound, graph_edit_distance, G0, G1, roots=(9, 3)
      )
      pytest.raises(
          nx.NodeNotFound, graph_edit_distance, G0, G1, roots=(3, 9)
      )
      pytest.raises(
          nx.NodeNotFound, graph_edit_distance, G0, G1, roots=(9, 9)
      )
      assert graph_edit_distance(G0, G1, roots=(1, 2)) == 0
      assert graph_edit_distance(G0, G1, roots=(0, 1)) == 8
      assert graph_edit_distance(G0, G1, roots=(1, 2), timeout=5) == 0
      assert graph_edit_distance(G0, G1, roots=(0, 1), timeout=5) == 8
      assert (
          graph_edit_distance(G0, G1, roots=(0, 1), timeout=0.0001)
          is None
      )
      # test raise on 0 timeout
      pytest.raises(
          nx.NetworkXError, graph_edit_distance, G0, G1, timeout=0
      )
  
imports: import pytest
  import networkx
  from networkx.algorithms.similarity import graph_edit_distance, optimal_edit_paths, optimize_graph_edit_distance
  from networkx.generators.classic import circular_ladder_graph, cycle_graph, path_graph, wheel_graph
label_desc: Use image node_id 2 for calling the TestSimilarity obj's underlying member method code with example usage: obj.test_graph_edit_distance_roots_and_timeout() without return types