test_discovery.py 文件源码

def test_discovery_from_dotted_path_builtin_modules(self):

        loader = unittest.TestLoader()

        listdir = os.listdir
        os.listdir = lambda _: ['test_this_does_not_exist.py']
        isfile = os.path.isfile
        isdir = os.path.isdir
        os.path.isdir = lambda _: False
        orig_sys_path = sys.path[:]
        def restore():
            os.path.isfile = isfile
            os.path.isdir = isdir
            os.listdir = listdir
            sys.path[:] = orig_sys_path
        self.addCleanup(restore)

        with self.assertRaises(TypeError) as cm:
            loader.discover('sys')
        self.assertEqual(str(cm.exception),
                         'Can not use builtin modules '
                         'as dotted module names')