Issue 19898: Add test for dequereviter_new.

(Patch contributed by Claudiu Popa.)

diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py
index 7bff1d2798b4ebb85f6e65b25c0a1b8941f5cb71..787181c72dcb1647aa38bfa7fa1247152cdbea6c 100644 (file)
--- a/Lib/test/test_deque.py
+++ b/Lib/test/test_deque.py
@@ -507,6 +507,11 @@ class TestBasic(unittest.TestCase):
         for s in ('abcd', range(2000)):
             self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
 
+    def test_reversed_new(self):
+        klass = type(reversed(deque()))
+        for s in ('abcd', range(2000)):
+            self.assertEqual(list(klass(deque(s))), list(reversed(s)))
+
     def test_gc_doesnt_blowup(self):
         import gc
         # This used to assert-fail in deque_traverse() under a debug