Adding a test for subclassing Mock with property

tests/testmock.py

@@ -487,6 +487,25 @@ class MockTest(unittest2.TestCase):
         self.assertRaises(AttributeError, _set)
 
 
+    def testSubclassWithProperties(self):
+        class SubClass(Mock):
+            def _get(self):
+                return 3
+            def _set(self, value):
+                raise NameError('strange error')
+            some_attribute = property(_get, _set)
+
+        s = SubClass(spec_set=SubClass)
+        self.assertEqual(s.some_attribute, 3)
+
+        def test():
+            s.some_attribute = 3
+        self.assertRaises(NameError, test)
+
+        def test():
+            s.foo = 'bar'
+        self.assertRaises(AttributeError, test)
+
 
 if __name__ == '__main__':
     unittest2.main()