def test_tracestate_update_invalid(self):
state = TraceState([("a", "1")])
new_state = state.update("a", "2=/")
self.assertNotEqual(new_state.get("a"), "2=/")
new_state = new_state.update("a", ",,2,,f")
self.assertNotEqual(new_state.get("a"), ",,2,,f")
self.assertEqual(new_state.get("a"), "1")
def test_tracestate_update_valid(self):
state = TraceState([("a", "1")])
new_state = state.update("a", "2")
self.assertEqual(new_state.get("a"), "2")
new_state = new_state.add("b", "3")
self.assertNotEqual(state, new_state)