def test_chipmunk_will_not_replace_existing_attribute(self):
Chipmunk.a = "acorn"
with self.assertRaises(AttributeError):
Chipmunk.a = "walnut"
with self.assertRaises(AttributeError):
Chipmunk.store_data('a', "acorn")
def test_that_chipmunk_can_hold_nut(self):
Chipmunk.a = "acorn"
self.assertEqual("acorn", Chipmunk.a)
Chipmunk.store_data('b', "walnut")
self.assertEqual("walnut", Chipmunk.b)
