1 files changed, 10 insertions, 0 deletions
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 900d8e4..26e38ab 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -202,6 +202,16 @@ class TestJointOps(unittest.TestCase):
         self.assertNotEqual(id(t), id(newt))
         self.assertEqual(t.value + 1, newt.value)
 
+    def test_gc(self):
+        # Create a nest of cycles to exercise overall ref count check
+        class A:
+            pass
+        s = set(A() for i in xrange(1000))
+        for elem in s:
+            elem.cycle = s
+            elem.sub = elem
+            elem.set = set([elem])
+
 class TestSet(TestJointOps):
     thetype = set