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-rw-r--r--Lib/test/test_zipfile.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index b7bc218..999197a 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -1855,11 +1855,14 @@ class OtherTests(unittest.TestCase):
self.assertEqual(zipf.comment, b"an updated comment")
# check that comments are correctly shortened in append mode
+ # and the file is indeed truncated
with zipfile.ZipFile(TESTFN,mode="w") as zipf:
zipf.comment = b"original comment that's longer"
zipf.writestr("foo.txt", "O, for a Muse of Fire!")
+ original_zip_size = os.path.getsize(TESTFN)
with zipfile.ZipFile(TESTFN,mode="a") as zipf:
zipf.comment = b"shorter comment"
+ self.assertTrue(original_zip_size > os.path.getsize(TESTFN))
with zipfile.ZipFile(TESTFN,mode="r") as zipf:
self.assertEqual(zipf.comment, b"shorter comment")