Method test_invalid_opening_mode

Lib/test/test_fileinput.py:231–235

(self)

        self.assertEqual(fi.fileno(), -1)

    def test_invalid_opening_mode(self):
        for mode in ('w', 'rU', 'U'):
            with self.subTest(mode=mode):
                with self.assertRaises(ValueError):
                    FileInput(mode=mode)

    def test_stdin_binary_mode(self):
        with mock.patch('sys.stdin') as m_stdin: