diff options
Diffstat (limited to 'Lib/test')
| -rw-r--r-- | Lib/test/test_unicode.py | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py index d54642f..f046938 100644 --- a/Lib/test/test_unicode.py +++ b/Lib/test/test_unicode.py @@ -2672,6 +2672,23 @@ class UnicodeTest(string_tests.CommonTest, self.assertTrue(astral >= bmp2) self.assertFalse(astral >= astral2) + @support.cpython_only + def test_pep393_utf8_caching_bug(self): + # Issue #25709: Problem with string concatenation and utf-8 cache + from _testcapi import getargs_s_hash + for k in 0x24, 0xa4, 0x20ac, 0x1f40d: + s = '' + for i in range(5): + # Due to CPython specific optimization the 's' string can be + # resized in-place. + s += chr(k) + # Parsing with the "s#" format code calls indirectly + # PyUnicode_AsUTF8AndSize() which creates the UTF-8 + # encoded string cached in the Unicode object. + self.assertEqual(getargs_s_hash(s), chr(k).encode() * (i + 1)) + # Check that the second call returns the same result + self.assertEqual(getargs_s_hash(s), chr(k).encode() * (i + 1)) + class StringModuleTest(unittest.TestCase): def test_formatter_parser(self): |