https://github.com/python/cpython/commit/9eb734111be90399fb6ae2f717d736abb8e518cb commit: 9eb734111be90399fb6ae2f717d736abb8e518cb branch: main author: Cody Maloney <[email protected]> committer: hauntsaninja <[email protected]> date: 2024-07-23T23:14:35-07:00 summary:
GH-120754: Add more tests around seek + readall (#122103) In the process of speeding up readall, A number of related tests (ex. large file tests in test_zipfile) found problems with the change I was making. This adds I/O tests to specifically test these cases to help ensure they don't regress and hopefully make debugging easier. This is part of the improvements from https://github.com/python/cpython/pull/121593#issuecomment-2222261986 files: M Lib/test/test_largefile.py diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py index 849b6cb3e50a19..41f7b70e5cfe81 100644 --- a/Lib/test/test_largefile.py +++ b/Lib/test/test_largefile.py @@ -141,6 +141,9 @@ def test_truncate(self): f.truncate(1) self.assertEqual(f.tell(), 0) # else pointer moved f.seek(0) + # Verify readall on a truncated file is well behaved. read() + # without a size can be unbounded, this should get just the byte + # that remains. self.assertEqual(len(f.read()), 1) # else wasn't truncated def test_seekable(self): @@ -151,6 +154,22 @@ def test_seekable(self): f.seek(pos) self.assertTrue(f.seekable()) + @bigmemtest(size=size, memuse=2, dry_run=False) + def test_seek_readall(self, _size): + # Seek which doesn't change position should readall successfully. + with self.open(TESTFN, 'rb') as f: + self.assertEqual(f.seek(0, os.SEEK_CUR), 0) + self.assertEqual(len(f.read()), size + 1) + + # Seek which changes (or might change) position should readall + # successfully. + with self.open(TESTFN, 'rb') as f: + self.assertEqual(f.seek(20, os.SEEK_SET), 20) + self.assertEqual(len(f.read()), size - 19) + + with self.open(TESTFN, 'rb') as f: + self.assertEqual(f.seek(-3, os.SEEK_END), size - 2) + self.assertEqual(len(f.read()), 3) def skip_no_disk_space(path, required): def decorator(fun): _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-checkins.python.org/ Member address: [email protected]
