code: def test_reverse():
      text = "(ROOT (S (NP (PRP I)) (VP (VBP want) (S (VP (TO to) (VP (VB lick) (NP (NP (NNP Jennifer) (POS 's)) (NNS antennae))))))))"
      trees = tree_reader.read_trees(text)
      assert len(trees) == 1
      reversed_tree = trees[0].reverse()
      assert (
          str(reversed_tree)
          == "(ROOT (S (VP (S (VP (VP (NP (NNS antennae) (NP (POS 's) (NNP Jennifer))) (VB lick)) (TO to))) (VBP want)) (NP (PRP I))))"
      )
  
imports: import pytest
  from stanza.models.constituency.parse_tree import Tree
  from stanza.models.constituency import tree_reader
  from stanza.tests import *
label_desc: Use image node_id 21 for calling a global function with example usage: test_reverse() without return types