Optimize the test for issue #13454.

serhiy-storchaka · serhiy-storchaka · commit 1c7181d764c3 · 2013-01-26T11:53:17.000+02:00
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
@@ -1269,10 +1269,8 @@ def test_tee(self):
 
     # Issue 13454: Crash when deleting backward iterator from tee()
     def test_tee_del_backward(self):
-        forward, backward = tee(range(20000000))
-        for i in forward:
-            pass
-
+        forward, backward = tee(repeat(None, 20000000))
+        any(forward)  # exhaust the iterator
         del backward
 
     def test_StopIteration(self):
