code: def test_examples():
      localdir = "./examples"
      for file in NOTEBOOKS_TO_TEST:
          nb, errors = run_notebook(os.path.join(localdir, file))
          assert len(errors) == 0
  
imports: import os
  import nbformat
  from nbconvert.preprocessors import ExecutePreprocessor
label_desc: Use image node_id 2 for calling a global function with example usage: test_examples() without return types