code: def test_as_json(self):
      md = metadata("distinfo-pkg").json
      assert "name" in md
      assert md["keywords"] == ["sample", "package"]
      desc = md["description"]
      assert desc.startswith("Once upon a time\nThere was")
      assert len(md["requires_dist"]) == 2
  
imports: import re
  import textwrap
  import unittest
  import warnings
  import importlib
  import contextlib
  from .None import fixtures
  from importlib.metadata import Distribution, PackageNotFoundError, distribution, entry_points, files, metadata, requires, version
label_desc: Use image node_id 28 for calling the APITests obj's underlying member method code with example usage: obj.test_as_json() without return types