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-rw-r--r--Lib/test/test_itertools.py17
1 files changed, 17 insertions, 0 deletions
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 53d65649ff..c012efd752 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -613,6 +613,23 @@ class TestBasicOps(unittest.TestCase):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
self.pickletest(proto, cycle('abc'))
+ for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+ # test with partial consumed input iterable
+ it = iter('abcde')
+ c = cycle(it)
+ _ = [next(c) for i in range(2)] # consume to 2 of 5 inputs
+ p = pickle.dumps(c, proto)
+ d = pickle.loads(p) # rebuild the cycle object
+ self.assertEqual(take(20, d), list('cdeabcdeabcdeabcdeab'))
+
+ # test with completely consumed input iterable
+ it = iter('abcde')
+ c = cycle(it)
+ _ = [next(c) for i in range(7)] # consume to 7 of 5 inputs
+ p = pickle.dumps(c, proto)
+ d = pickle.loads(p) # rebuild the cycle object
+ self.assertEqual(take(20, d), list('cdeabcdeabcdeabcdeab'))
+
def test_cycle_setstate(self):
# Verify both modes for restoring state