Method test_lone_surrogates

Lib/test/test_codecs.py:394–436

(self)

    ill_formed_sequence_replace = "\ufffd"

    def test_lone_surrogates(self):
        self.assertRaises(UnicodeEncodeError, "\ud800".encode, self.encoding)
        self.assertEqual("[\uDC80]".encode(self.encoding, "backslashreplace"),
                         "[\\udc80]".encode(self.encoding))
        self.assertEqual("[\uDC80]".encode(self.encoding, "namereplace"),
                         "[\\udc80]".encode(self.encoding))
        self.assertEqual("[\uDC80]".encode(self.encoding, "xmlcharrefreplace"),
                         "[�]".encode(self.encoding))
        self.assertEqual("[\uDC80]".encode(self.encoding, "ignore"),
                         "[]".encode(self.encoding))
        self.assertEqual("[\uDC80]".encode(self.encoding, "replace"),
                         "[?]".encode(self.encoding))

        # sequential surrogate characters
        self.assertEqual("[\uD800\uDC80]".encode(self.encoding, "ignore"),
                         "[]".encode(self.encoding))
        self.assertEqual("[\uD800\uDC80]".encode(self.encoding, "replace"),
                         "[??]".encode(self.encoding))

        bom = "".encode(self.encoding)
        for before, after in [("\U00010fff", "A"), ("[", "]"),
                              ("A", "\U00010fff")]:
            before_sequence = before.encode(self.encoding)[len(bom):]
            after_sequence = after.encode(self.encoding)[len(bom):]
            test_string = before + "\uDC80" + after
            test_sequence = (bom + before_sequence +
                             self.ill_formed_sequence + after_sequence)
            self.assertRaises(UnicodeDecodeError, test_sequence.decode,
                              self.encoding)
            self.assertEqual(test_string.encode(self.encoding,
                                                "surrogatepass"),
                             test_sequence)
            self.assertEqual(test_sequence.decode(self.encoding,
                                                  "surrogatepass"),
                             test_string)
            self.assertEqual(test_sequence.decode(self.encoding, "ignore"),
                             before + after)
            self.assertEqual(test_sequence.decode(self.encoding, "replace"),
                             before + self.ill_formed_sequence_replace + after)
            backslashreplace = ''.join('\\x%02x' % b
                                       for b in self.ill_formed_sequence)
            self.assertEqual(test_sequence.decode(self.encoding, "backslashreplace"),
                             before + backslashreplace + after)

    def test_incremental_surrogatepass(self):
        # Test incremental decoder for surrogatepass handler: