code: def test_get_backdoor_paths(self):
      res1 = self.graph_obj.get_backdoor_paths(
          self.action_node, self.outcome_node
      )
      res2 = get_backdoor_paths(
          self.nx_graph, self.action_node, self.outcome_node
      )
      assert res1 == res2
  
imports: import networkx
  import pandas
  import pytest
  from flaky import flaky
  from pytest import mark
  import dowhy
  import dowhy.datasets
  from dowhy import CausalModel
  from dowhy.graph import *
  from dowhy.utils.graph_operations import daggity_to_dot
label_desc: Use image node_id 4 for calling the TestCausalGraph obj's underlying member method code with example usage: obj.test_get_backdoor_paths() without return types