public void Can_register_message_handler()
        {
            var sut = new ConsumerConfigurationBuilder();

            sut.WithGroupId("foo");
            sut.WithBootstrapServers("bar");
            sut.RegisterMessageHandler <DummyMessage, DummyMessageHandler>("dummyTopic", nameof(DummyMessage));

            var configuration = sut.Build();

            var registration = configuration.MessageHandlerRegistry.GetRegistrationFor(nameof(DummyMessage));

            Assert.Equal(typeof(DummyMessageHandler), registration.HandlerInstanceType);
        }