public void assert_with_any_messages_blows_up()
        {
            var ex = new ScenarioAssertionException();

            ex.Add("You stink!");

            Exception <ScenarioAssertionException> .ShouldBeThrownBy(() => ex.AssertAll());
        }
        public void assert_does_nothing_with_no_messages()
        {
            var ex = new ScenarioAssertionException();

            ex.AssertAll(); // all good!
        }