code: def test_dls_tree(self):
      T = nx.dfs_tree(self.G, source=3, depth_limit=1)
      assert sorted(T.edges()) == [(3, 2), (3, 4)]
  
imports: import networkx
label_desc: Use image node_id 6 for calling the TestDepthLimitedSearch obj's underlying member method code with example usage: obj.test_dls_tree() without return types