public async Task can_collate_abstract_types()
        {
            var message = new SpecificMessage2();

            await Execute(message);

            HandlerWithMultipleCalls.LastIMessage.ShouldBeSameAs(message);
            HandlerWithMultipleCalls.LastBaseMessage.ShouldBeSameAs(message);
        }
 public void Handle(SpecificMessage2 message2)
 {
 }