code: def test_trivial_2():
      print("trivial test 2")
  
      edges_1 = [("a", "b"), ("a", "c")]
  
      edges_2 = [("v", "y")]
  
      t1 = nx.Graph()
      t1.add_edges_from(edges_1)
  
      t2 = nx.Graph()
      t2.add_edges_from(edges_2)
  
      isomorphism = tree_isomorphism(t1, t2)
  
      # they cannot be isomorphic,
      # since they have different numbers of nodes
      assert isomorphism == []
  
file_path: networkx/networkx/algorithms/isomorphism/tests/test_tree_isomorphism.py
imports: import random
  import time
  import pytest
  import networkx
  from networkx.algorithms.isomorphism.tree_isomorphism import rooted_tree_isomorphism, tree_isomorphism
  from networkx.classes.function import is_directed
label_desc: Use image node_id 8 for calling a global function with example usage: test_trivial_2() without return types