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Issue #26194: Fix undefined behavior for deque.insert() when len(d) == maxlen

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This commit is contained in:
Raymond Hettinger 2016-01-26 21:44:16 -08:00
parent d4e51f45a9
commit 3743432302
4 changed files with 28 additions and 0 deletions
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14
Lib/test/test_deque.py
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@ -304,6 +304,20 @@ class TestBasic(unittest.TestCase):
s.insert(i, 'Z')
self.assertEqual(list(d), s)
def test_index_bug_26194(self):
data = 'ABC'
for i in range(len(data) + 1):
d = deque(data, len(data))
d.insert(i, None)
s = list(data)
s.insert(i, None)
s.pop()
self.assertEqual(list(d), s)
if i < len(data):
self.assertIsNone(d[i])
else:
self.assertTrue(None not in d)
def test_imul(self):
for n in (-10, -1, 0, 1, 2, 10, 1000):
d = deque()