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-rw-r--r--Lib/test/test_set.py13
1 files changed, 13 insertions, 0 deletions
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index a21d53c..f393712 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -213,6 +213,19 @@ class TestJointOps(unittest.TestCase):
elem.sub = elem
elem.set = set([elem])
+ def test_subclass_with_custom_hash(self):
+ # Bug #1257731
+ class H(self.thetype):
+ def __hash__(self):
+ return id(self)
+ s=H()
+ f=set()
+ f.add(s)
+ self.assert_(s in f)
+ f.remove(s)
+ f.add(s)
+ f.discard(s)
+
class TestSet(TestJointOps):
thetype = set