Method test_iter_importers

Lib/test/test_pkgutil.py:449–494

(self)

    # Another awful testing hack to be cleaned up once the test_runpy
    # helpers are factored out to a common location
    def test_iter_importers(self):
        iter_importers = pkgutil.iter_importers
        get_importer = pkgutil.get_importer

        pkgname = 'spam'
        modname = 'eggs'
        dirname = self.create_init(pkgname)
        pathitem = os.path.join(dirname, pkgname)
        fullname = '{}.{}'.format(pkgname, modname)
        sys.modules.pop(fullname, None)
        sys.modules.pop(pkgname, None)
        try:
            self.create_submodule(dirname, pkgname, modname, 0)

            importlib.import_module(fullname)

            importers = list(iter_importers(fullname))
            expected_importer = get_importer(pathitem)
            for finder in importers:
                spec = finder.find_spec(fullname)
                loader = spec.loader
                try:
                    loader = loader.loader
                except AttributeError:
                    # For now we still allow raw loaders from
                    # find_module().
                    pass
                self.assertIsInstance(finder, importlib.machinery.FileFinder)
                self.assertEqual(finder, expected_importer)
                self.assertIsInstance(loader,
                                      importlib.machinery.SourceFileLoader)
                self.assertIsNone(finder.find_spec(pkgname))

            with self.assertRaises(ImportError):
                list(iter_importers('invalid.module'))

            with self.assertRaises(ImportError):
                list(iter_importers('.spam'))
        finally:
            shutil.rmtree(dirname)
            del sys.path[0]
            try:
                del sys.modules['spam']
                del sys.modules['spam.eggs']
            except KeyError:
                pass


    def test_mixed_namespace(self):