def METHOD_NAME(self):
    # see #1620
    base = BaseClass()
    self.assertEqual(base.spam, 5)
    self.assertEqual(base._spam, 5)
    base.spam = 10
    self.assertEqual(base.spam, 10)
    self.assertEqual(base._spam, 10)
    delattr(base, "spam")
    self.assertTrue(not hasattr(base, "spam"))
    self.assertTrue(not hasattr(base, "_spam"))
    base.spam = 20
    self.assertEqual(base.spam, 20)
    self.assertEqual(base._spam, 20)