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//usr/local/lib/python3.9/test/test_importlib/builtin/test_finder.py

from .. import abc
from .. import util

machinery = util.import_importlib('importlib.machinery')

import sys
import unittest

@unittest.skipIf(util.BUILTINS.good_name is None, 'no reasonable builtin module')
class FindSpecTests(abc.FinderTests):

"""Test find_spec() for built-in modules."""

def test_module(self):
        # Common case.
        with util.uncache(util.BUILTINS.good_name):
            found = self.machinery.BuiltinImporter.find_spec(util.BUILTINS.good_name)
            self.assertTrue(found)
            self.assertEqual(found.origin, 'built-in')

# Built-in modules cannot be a package.
    test_package = None

# Built-in modules cannot be in a package.
    test_module_in_package = None

# Built-in modules cannot be a package.
    test_package_in_package = None

# Built-in modules cannot be a package.
    test_package_over_module = None

def test_failure(self):
        name = 'importlib'
        assert name not in sys.builtin_module_names
        spec = self.machinery.BuiltinImporter.find_spec(name)
        self.assertIsNone(spec)

def test_ignore_path(self):
        # The value for 'path' should always trigger a failed import.
        with util.uncache(util.BUILTINS.good_name):
            spec = self.machinery.BuiltinImporter.find_spec(util.BUILTINS.good_name,
                                                            ['pkg'])
            self.assertIsNone(spec)

(Frozen_FindSpecTests,
 Source_FindSpecTests
 ) = util.test_both(FindSpecTests, machinery=machinery)

@unittest.skipIf(util.BUILTINS.good_name is None, 'no reasonable builtin module')
class FinderTests(abc.FinderTests):

"""Test find_module() for built-in modules."""

def test_module(self):
        # Common case.
        with util.uncache(util.BUILTINS.good_name):
            found = self.machinery.BuiltinImporter.find_module(util.BUILTINS.good_name)
            self.assertTrue(found)
            self.assertTrue(hasattr(found, 'load_module'))

# Built-in modules cannot be a package.
    test_package = test_package_in_package = test_package_over_module = None

# Built-in modules cannot be in a package.
    test_module_in_package = None

def test_failure(self):
        assert 'importlib' not in sys.builtin_module_names
        loader = self.machinery.BuiltinImporter.find_module('importlib')
        self.assertIsNone(loader)

def test_ignore_path(self):
        # The value for 'path' should always trigger a failed import.
        with util.uncache(util.BUILTINS.good_name):
            loader = self.machinery.BuiltinImporter.find_module(util.BUILTINS.good_name,
                                                            ['pkg'])
            self.assertIsNone(loader)

(Frozen_FinderTests,
 Source_FinderTests
 ) = util.test_both(FinderTests, machinery=machinery)

if __name__ == '__main__':
    unittest.main()