public void AddControllerAsServices_MultipleCalls_RetainsPreviouslyAddedTypes()
        {
            // Arrange
            var services = new ServiceCollection();
            var manager = new ApplicationPartManager();
            manager.ApplicationParts.Add(new TestApplicationPart(typeof(ControllerOne), typeof(ControllerTwo)));
            manager.FeatureProviders.Add(new TestFeatureProvider());
            var builder = new MvcBuilder(services, manager);

            builder.AddControllersAsServices();

            // Act
            builder.AddControllersAsServices();

            // Assert 2
            var collection = services.ToList();
            Assert.Equal(3, collection.Count);
            Assert.Single(collection, d => d.ServiceType.Equals(typeof(ControllerOne)));
            Assert.Single(collection, d => d.ServiceType.Equals(typeof(ControllerTwo)));
        }
        public void WithControllersAsServices_AddsTypesToControllerTypeProviderAndServiceCollection()
        {
            // Arrange
            var collection = new ServiceCollection();
            var controllerTypes = new[]
            {
                typeof(ControllerTypeA),
                typeof(TypeBController),
            }.Select(t => t.GetTypeInfo()).ToArray();

            var builder = new MvcBuilder(collection, GetApplicationPartManager(controllerTypes));

            // Act
            builder.AddControllersAsServices();

            // Assert
            var services = collection.ToList();
            Assert.Equal(3, services.Count);
            Assert.Equal(typeof(ControllerTypeA), services[0].ServiceType);
            Assert.Equal(typeof(ControllerTypeA), services[0].ImplementationType);
            Assert.Equal(ServiceLifetime.Transient, services[0].Lifetime);

            Assert.Equal(typeof(TypeBController), services[1].ServiceType);
            Assert.Equal(typeof(TypeBController), services[1].ImplementationType);
            Assert.Equal(ServiceLifetime.Transient, services[1].Lifetime);

            Assert.Equal(typeof(IControllerActivator), services[2].ServiceType);
            Assert.Equal(typeof(ServiceBasedControllerActivator), services[2].ImplementationType);
            Assert.Equal(ServiceLifetime.Transient, services[2].Lifetime);
        }