diff options
Diffstat (limited to 'Lib/test/test_largefile.py')
| -rw-r--r-- | Lib/test/test_largefile.py | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py index d07bb8e..fd2cc03 100644 --- a/Lib/test/test_largefile.py +++ b/Lib/test/test_largefile.py @@ -5,12 +5,12 @@ import os import stat import sys import unittest -from test.support import TESTFN, requires, unlink +from test.support import TESTFN, requires, unlink, bigmemtest import io # C implementation of io import _pyio as pyio # Python implementation of io -# size of file to create (>2GB; 2GB == 2147483648 bytes) -size = 2500000000 +# size of file to create (>2 GiB; 2 GiB == 2,147,483,648 bytes) +size = 2_500_000_000 class LargeFileTest: """Test that each file function works as expected for large @@ -45,6 +45,15 @@ class LargeFileTest: raise cls.failureException('File was not truncated by opening ' 'with mode "wb"') + # _pyio.FileIO.readall() uses a temporary bytearray then casted to bytes, + # so memuse=2 is needed + @bigmemtest(size=size, memuse=2, dry_run=False) + def test_large_read(self, _size): + # bpo-24658: Test that a read greater than 2GB does not fail. + with self.open(TESTFN, "rb") as f: + self.assertEqual(len(f.read()), size + 1) + self.assertEqual(f.tell(), size + 1) + def test_osstat(self): self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1) |