def test_immutable(self):
i = ImmutableDict({"true": True})
with self.assertRaises(RuntimeError):
i.clear()
with self.assertRaises(RuntimeError):
i.pop("true")
with self.assertRaises(RuntimeError):
i.popitem()
with self.assertRaises(RuntimeError):
i.setdefault("false", False)
with self.assertRaises(RuntimeError):
i.update(one=1)
self.assertEqual(i, {"true": True})
