code: def test_docinfo(app, status, warning):
      """
      Inspect the 'docinfo' metadata stored in the first node of the document.
      Note this doesn't give us access to data stored in subsequence blocks
      that might be considered document metadata, such as 'abstract' or
      'dedication' blocks, or the 'meta' role. Doing otherwise is probably more
      messing with the internals of sphinx than this rare use case merits.
      """
      app.build()
      expecteddocinfo = {
          "author": "David Goodger",
          "authors": ["Me", "Myself", "I"],
          "address": "123 Example Street\nExample, EX  Canada\nA1B 2C3",
          "field name": "This is a generic bibliographic field.",
          "field name 2": (
              "Generic bibliographic fields may contain multiple "
              "body elements.\n\nLike this."
          ),
          "status": "This is a “work in progress”",
          "version": "1",
          "copyright": (
              "This document has been placed in the public domain. "
              "You\nmay do with it as you wish. You may copy, modify,"
              "\nredistribute, reattribute, sell, buy, rent, lease,\n"
              "destroy, or improve it, quote it at length, excerpt,\n"
              "incorporate, collate, fold, staple, or mutilate it, or "
              "do\nanything else to it that your or anyone else’s "
              "heart\ndesires."
          ),
          "contact": "goodger@python.org",
          "date": "2006-05-21",
          "organization": "humankind",
          "revision": "4564",
          "tocdepth": 1,
          "orphan": "",
          "nocomments": "",
      }
      assert app.env.metadata["index"] == expecteddocinfo
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_docinfo(app, status, warning) without return types