diff options
| -rw-r--r-- | Lib/test/test_largefile.py | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py index 849b6cb..41f7b70 100644 --- a/Lib/test/test_largefile.py +++ b/Lib/test/test_largefile.py @@ -141,6 +141,9 @@ class TestFileMethods(LargeFileTest): 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 @@ class TestFileMethods(LargeFileTest): 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): |