Method test_large_filesize

Lib/test/test_mmap.py:1256–1266

(self)

                self.assertEqual(m[0xFFFFFFF], 32)

    def test_large_filesize(self):
        with self._make_test_file(0x17FFFFFFF, b" ") as f:
            if sys.maxsize < 0x180000000:
                # On 32 bit platforms the file is larger than sys.maxsize so
                # mapping the whole file should fail -- Issue #16743
                with self.assertRaises(OverflowError):
                    mmap.mmap(f.fileno(), 0x180000000, access=mmap.ACCESS_READ)
                with self.assertRaises(ValueError):
                    mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
            with mmap.mmap(f.fileno(), 0x10000, access=mmap.ACCESS_READ) as m:
                self.assertEqual(m.size(), 0x180000000)

    # Issue 11277: mmap() with large (~4 GiB) sparse files crashes on OS X.