code: def test_prefix_not_matched(self):
      prefixes = "p", "pkg", "pkg."
      for prefix in prefixes:
          with self.subTest(prefix):
              with self.assertRaises(PackageNotFoundError):
                  distribution(prefix)
  
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 5 for calling the APITests obj's underlying member method code with example usage: obj.test_prefix_not_matched() without return types