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GH-120754: Add more tests around seek + readall (#122103)

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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
This commit is contained in:
Cody Maloney 2024-07-23 23:14:35 -07:00 committed by GitHub
parent e91ef13861
commit 9eb734111b
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1 changed files with 19 additions and 0 deletions
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19
Lib/test/test_largefile.py
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@ -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):