Method test_const

Lib/test/test_argparse.py:813–819

(self)

    ]

    def test_const(self):
        # See bpo-40862
        parser = argparse.ArgumentParser()
        with self.assertRaises(TypeError) as cm:
            parser.add_argument('--foo', const=True, action=argparse.BooleanOptionalAction)

        self.assertIn("got an unexpected keyword argument 'const'", str(cm.exception))

    def test_invalid_name(self):
        parser = argparse.ArgumentParser()