Method test_warnings

Lib/test/test_codecs.py:1203–1233

(self)

        check(br"[\x410]", b"[A0]")

    def test_warnings(self):
        decode = codecs.escape_decode
        check = coding_checker(self, decode)
        for i in range(97, 123):
            b = bytes([i])
            if b not in b'abfnrtvx':
                with self.assertWarnsRegex(DeprecationWarning,
                        r'"\\%c" is an invalid escape sequence' % i):
                    check(b"\\" + b, b"\\" + b)
            with self.assertWarnsRegex(DeprecationWarning,
                    r'"\\%c" is an invalid escape sequence' % (i-32)):
                check(b"\\" + b.upper(), b"\\" + b.upper())
        with self.assertWarnsRegex(DeprecationWarning,
                r'"\\8" is an invalid escape sequence'):
            check(br"\8", b"\\8")
        with self.assertWarns(DeprecationWarning):
            check(br"\9", b"\\9")
        with self.assertWarnsRegex(DeprecationWarning,
                r'"\\\xfa" is an invalid escape sequence') as cm:
            check(b"\\\xfa", b"\\\xfa")
        for i in range(0o400, 0o1000):
            with self.assertWarnsRegex(DeprecationWarning,
                    r'"\\%o" is an invalid octal escape sequence' % i):
                check(rb'\%o' % i, bytes([i & 0o377]))

        with self.assertWarnsRegex(DeprecationWarning,
                r'"\\z" is an invalid escape sequence'):
            self.assertEqual(decode(br'\x\z', 'ignore'), (b'\\z', 4))
        with self.assertWarnsRegex(DeprecationWarning,
                r'"\\501" is an invalid octal escape sequence'):
            self.assertEqual(decode(br'\x\501', 'ignore'), (b'A', 6))

    def test_errors(self):
        decode = codecs.escape_decode