Optimize the test for issue #13454.

Now it requires almost 4x less memory and is almost 2x faster.

diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 6f933c56da13660db656c7aad8d38b0e6e38cdab..db9f437d37af64486ea1b04782ce54bb3877c799 100644 (file)
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -908,10 +908,8 @@ class TestBasicOps(unittest.TestCase):
 
     # Issue 13454: Crash when deleting backward iterator from tee()
     def test_tee_del_backward(self):
-        forward, backward = tee(xrange(20000000))
-        for i in forward:
-            pass
-
+        forward, backward = tee(repeat(None, 20000000))
+        any(forward)  # exhaust the iterator
         del backward
 
     def test_StopIteration(self):