Method test_invalid_modes

Lib/test/test_codecs.py:728–738

(self)

            self.assertEqual(reader.read(), s1)

    def test_invalid_modes(self):
        for mode in ('U', 'rU', 'r+U'):
            with self.assertRaises(ValueError) as cm:
                codecs_open_no_warn(os_helper.TESTFN, mode, encoding=self.encoding)
            self.assertIn('invalid mode', str(cm.exception))

        for mode in ('rt', 'wt', 'at', 'r+t'):
            with self.assertRaises(ValueError) as cm:
                codecs_open_no_warn(os_helper.TESTFN, mode, encoding=self.encoding)
            self.assertIn("can't have text and binary mode at once",
                          str(cm.exception))


class UTF16LETest(ReadTest, unittest.TestCase):