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DecoratorTests.cs
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DecoratorTests.cs
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using System.Linq;
using Autofac.Core;
using Xunit;
namespace Autofac.Test.Features.Decorators
{
public class DecoratorTests
{
private interface IDecoratedService : IService
{
IDecoratedService Decorated { get; }
}
private interface IService
{
}
private interface IAutoWiredService
{
bool NestedServiceIsNotNull();
}
private class NestedService
{
}
private class AutoWiredService : IAutoWiredService
{
public NestedService NestedService { get; set; }
public bool NestedServiceIsNotNull()
{
return NestedService != null;
}
}
private class AutoWiredServiceDecorator : IAutoWiredService
{
private readonly IAutoWiredService _original;
public AutoWiredServiceDecorator(IAutoWiredService original)
{
_original = original;
}
public bool NestedServiceIsNotNull()
{
return _original.NestedServiceIsNotNull();
}
}
public class Foo
{
}
public class Bar : IBar
{
}
public interface IBar
{
}
public class BarDecorator : IBar
{
public BarDecorator(IBar bar)
{
}
}
[Fact]
public void DecoratorWorksOnAdapter()
{
var builder = new ContainerBuilder();
builder.RegisterType<Foo>();
builder.RegisterAdapter<Foo, IBar>(f => new Bar());
builder.RegisterDecorator<BarDecorator, IBar>();
var container = builder.Build();
Assert.IsType<BarDecorator>(container.Resolve<IBar>());
}
[Fact]
public void DecoratedInstancePerDependencyRegistrationCanIncludeOtherServices()
{
var builder = new ContainerBuilder();
builder.RegisterType<ImplementorA>().As<IDecoratedService>().As<IService>();
builder.RegisterDecorator<DecoratorA, IDecoratedService>();
var container = builder.Build();
var serviceRegistration = container.RegistrationFor<IService>();
var decoratedServiceRegistration = container.RegistrationFor<IDecoratedService>();
Assert.NotNull(serviceRegistration);
Assert.NotNull(decoratedServiceRegistration);
Assert.Same(serviceRegistration, decoratedServiceRegistration);
var serviceInstance = container.Resolve<IService>();
Assert.IsType<ImplementorA>(serviceInstance);
var decoratedServiceInstance = container.Resolve<IDecoratedService>();
Assert.IsType<DecoratorA>(decoratedServiceInstance);
Assert.NotSame(serviceInstance, decoratedServiceInstance);
}
[Fact]
public void DecoratedInstancePerLifetimeScopeRegistrationCanIncludeOtherServices()
{
var builder = new ContainerBuilder();
// #963: The InstancePerLifetimeScope here is important - a single component may expose multiple services.
// If that component is decorated, the decorator ALSO needs to expose all of those services.
builder.RegisterType<ImplementorA>().As<IDecoratedService>().As<IService>().InstancePerLifetimeScope();
builder.RegisterDecorator<DecoratorA, IDecoratedService>();
var container = builder.Build();
var serviceRegistration = container.RegistrationFor<IService>();
var decoratedServiceRegistration = container.RegistrationFor<IDecoratedService>();
Assert.NotNull(serviceRegistration);
Assert.NotNull(decoratedServiceRegistration);
Assert.Same(serviceRegistration, decoratedServiceRegistration);
var serviceInstance = container.Resolve<IService>();
Assert.IsType<ImplementorA>(serviceInstance);
var decoratedServiceInstance = container.Resolve<IDecoratedService>();
Assert.IsType<DecoratorA>(decoratedServiceInstance);
Assert.Same(serviceInstance, decoratedServiceInstance.Decorated);
}
[Fact]
public void DecoratedSingleInstanceRegistrationCanIncludeOtherServices()
{
var builder = new ContainerBuilder();
// #963: The SingleInstance here is important - a single component may expose multiple services.
// If that component is decorated, the decorator ALSO needs to expose all of those services.
builder.RegisterType<ImplementorA>().As<IDecoratedService>().As<IService>().SingleInstance();
builder.RegisterDecorator<DecoratorA, IDecoratedService>();
var container = builder.Build();
var serviceRegistration = container.RegistrationFor<IService>();
var decoratedServiceRegistration = container.RegistrationFor<IDecoratedService>();
Assert.NotNull(serviceRegistration);
Assert.NotNull(decoratedServiceRegistration);
Assert.Same(serviceRegistration, decoratedServiceRegistration);
var serviceInstance = container.Resolve<IService>();
Assert.IsType<ImplementorA>(serviceInstance);
var decoratedServiceInstance = container.Resolve<IDecoratedService>();
Assert.IsType<DecoratorA>(decoratedServiceInstance);
Assert.Same(serviceInstance, decoratedServiceInstance.Decorated);
}
[Fact]
public void RegistrationIncludesTheServiceType()
{
var builder = new ContainerBuilder();
builder.RegisterType<ImplementorA>().As<IDecoratedService>();
builder.RegisterDecorator<DecoratorA, IDecoratedService>();
var container = builder.Build();
var registration = container.RegistrationFor<IDecoratedService>();
Assert.NotNull(registration);
var decoratedService = new TypedService(typeof(IDecoratedService));
Assert.Contains(registration.Services.OfType<TypedService>(), s => s == decoratedService);
}
[Fact]
public void RegistrationTargetsTheImplementationType()
{
var builder = new ContainerBuilder();
builder.RegisterType<ImplementorA>().As<IDecoratedService>();
builder.RegisterDecorator<DecoratorA, IDecoratedService>();
var container = builder.Build();
var registration = container.RegistrationFor<IDecoratedService>();
Assert.NotNull(registration);
Assert.Equal(typeof(ImplementorA), registration.Target.Activator.LimitType);
}
[Fact]
public void DecorateReflectionActivatorWithPropertyInjection()
{
var builder = new ContainerBuilder();
builder.RegisterType<NestedService>();
builder.RegisterType<AutoWiredService>().As<IAutoWiredService>().PropertiesAutowired();
builder.RegisterDecorator<AutoWiredServiceDecorator, IAutoWiredService>();
var container = builder.Build();
var service = container.Resolve<IAutoWiredService>();
Assert.True(service.NestedServiceIsNotNull());
}
[Fact]
public void DecorateProvidedInstanceActivatorWithPropertyInjection()
{
var builder = new ContainerBuilder();
builder.RegisterType<NestedService>();
builder.RegisterInstance<IAutoWiredService>(new AutoWiredService()).PropertiesAutowired();
builder.RegisterDecorator<AutoWiredServiceDecorator, IAutoWiredService>();
var container = builder.Build();
var service = container.Resolve<IAutoWiredService>();
Assert.True(service.NestedServiceIsNotNull());
}
private abstract class Decorator : IDecoratedService
{
protected Decorator(IDecoratedService decorated)
{
this.Decorated = decorated;
}
public IDecoratedService Decorated { get; }
}
private class DecoratorA : Decorator
{
public DecoratorA(IDecoratedService decorated)
: base(decorated)
{
}
}
private class ImplementorA : IDecoratedService
{
public IDecoratedService Decorated => this;
}
}
}