code: def test_suite():
      import doctest
  
      return doctest.DocFileSuite(
          "README.txt",
          optionflags=doctest.ELLIPSIS
          | doctest.REPORT_ONLY_FIRST_FAILURE,
      )
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_suite() and returns: doctest