Method test_raiseMemError

Lib/test/test_str.py:2479–2515

(self)

    @unittest.expectedFailure  # TODO: RUSTPYTHON
    def test_raiseMemError(self):
        asciifields = "nnb"
        compactfields = asciifields + "nP"
        ascii_struct_size = support.calcobjsize(asciifields)
        compact_struct_size = support.calcobjsize(compactfields)

        for char in ('a', '\xe9', '\u20ac', '\U0010ffff'):
            code = ord(char)
            if code < 0x80:
                char_size = 1  # sizeof(Py_UCS1)
                struct_size = ascii_struct_size
            elif code < 0x100:
                char_size = 1  # sizeof(Py_UCS1)
                struct_size = compact_struct_size
            elif code < 0x10000:
                char_size = 2  # sizeof(Py_UCS2)
                struct_size = compact_struct_size
            else:
                char_size = 4  # sizeof(Py_UCS4)
                struct_size = compact_struct_size
            # Note: sys.maxsize is half of the actual max allocation because of
            # the signedness of Py_ssize_t. Strings of maxlen-1 should in principle
            # be allocatable, given enough memory.
            maxlen = ((sys.maxsize - struct_size) // char_size)
            alloc = lambda: char * maxlen
            with self.subTest(
                char=char,
                struct_size=struct_size,
                char_size=char_size
            ):
                # self-check
                self.assertEqual(
                    sys.getsizeof(char * 42),
                    struct_size + (char_size * (42 + 1))
                )
                self.assertRaises(MemoryError, alloc)
                self.assertRaises(MemoryError, alloc)

    def test_format_subclass(self):
        class S(str):