code: def test_simplify_labels():
      text = "( (SBARQ-FOO (WHNP-BAR (WP Who)) (SQ#ASDF (VP=1 (VBZ sits) (PP (IN in) (NP (DT this) (- -))))) (. ?)))"
      expected = "(ROOT (SBARQ (WHNP (WP Who)) (SQ (VP (VBZ sits) (PP (IN in) (NP (DT this) (- -))))) (. ?)))"
      trees = tree_reader.read_trees(text)
      trees = [t.simplify_labels() for t in trees]
      assert len(trees) == 1
      assert expected == str(trees[0])
  
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 11 for calling a global function with example usage: test_simplify_labels() without return types