如何在 SimpleInjector 2.6.1+ 中对打开的通用装饰器链进行单元测试

给定以下使用 SimpleInjector 的开放式通用装饰器链：

container.RegisterManyForOpenGeneric(typeof(IHandleQuery<,>), assemblies);
container.RegisterDecorator(
    typeof(IHandleQuery<,>),
    typeof(ValidateQueryDecorator<,>)
);
container.RegisterSingleDecorator(
    typeof(IHandleQuery<,>),
    typeof(QueryLifetimeScopeDecorator<,>)
);
container.RegisterSingleDecorator(
    typeof(IHandleQuery<,>),
    typeof(QueryNotNullDecorator<,>)
);

使用 SimpleInjector 2.4.0，我能够使用以下代码对其进行单元测试以断言装饰链：

[Fact]
public void RegistersIHandleQuery_UsingOpenGenerics_WithDecorationChain()
{
    var instance = Container
        .GetInstance<IHandleQuery<FakeQueryWithoutValidator, string>>();
    InstanceProducer registration = Container.GetRegistration(
        typeof(IHandleQuery<FakeQueryWithoutValidator, string>));

    instance.ShouldNotBeNull();
    registration.Registration.ImplementationType
        .ShouldEqual(typeof(HandleFakeQueryWithoutValidator));
    registration.Registration.Lifestyle.ShouldEqual(Lifestyle.Transient);
    var decoratorChain = registration.GetRelationships()
        .Select(x => new
        {
            x.ImplementationType,
            x.Lifestyle,
        })
        .Reverse().Distinct().ToArray();
    decoratorChain.Length.ShouldEqual(3);
    decoratorChain[0].ImplementationType.ShouldEqual(
        typeof(QueryNotNullDecorator<FakeQueryWithoutValidator, string>));
    decoratorChain[0].Lifestyle.ShouldEqual(Lifestyle.Singleton);
    decoratorChain[1].ImplementationType.ShouldEqual(
        typeof(QueryLifetimeScopeDecorator<FakeQueryWithoutValidator, string>));
    decoratorChain[1].Lifestyle.ShouldEqual(Lifestyle.Singleton);
    decoratorChain[2].ImplementationType.ShouldEqual(
        typeof(ValidateQueryDecorator<FakeQueryWithoutValidator, string>));
    decoratorChain[2].Lifestyle.ShouldEqual(Lifestyle.Transient);
}

更新到 SimpleInjector 2.6.1 后，此单元测试失败。看起来InstanceProducer.Registration.ImplementationType现在返回第一个装饰处理程序而不是装饰处理程序（意味着，它返回typeof(QueryNotNullDecorator<HandleFakeQueryWithoutValidator,string>)代替typeof(HandleFakeQueryWithoutValidator).

Also, InstanceProducer.GetRelationships()不再返回链中的所有装饰器。它也只返回第一个装饰器。

这是一个错误吗？如果不是，我们如何使用 SimpleInjector 2.6.1+ 对开放通用装饰器链进行单元测试？

依赖图的可用细节在 2.6 中得到了极大的改进。您可以使用以下代码实现相同的目标：

[Fact]
public void RegistersIHandleQuery_UsingOpenGenerics_WithDecorationChain()
{
    var container = this.ContainerFactory();

    var instance = container
        .GetInstance<IHandleQuery<FakeQueryWithoutValidator, string>>();

    var registration = (
        from currentRegistration in container.GetCurrentRegistrations()
        where currentRegistration.ServiceType ==
            typeof(IHandleQuery<FakeQueryWithoutValidator, string>)
        select currentRegistration.Registration)
        .Single();
    Assert.Equal(
        typeof(QueryNotNullDecorator<FakeQueryWithoutValidator, string>), 
        registration.ImplementationType);
    Assert.Equal(Lifestyle.Singleton, registration.Lifestyle);

    registration = registration.GetRelationships().Single().Dependency.Registration;
    Assert.Equal(
        typeof(QueryLifetimeScopeDecorator<FakeQueryWithoutValidator, string>), 
        registration.ImplementationType);
    Assert.Equal(Lifestyle.Singleton, registration.Lifestyle);

    registration = registration.GetRelationships().Single().Dependency.Registration;
    Assert.Equal(
        typeof(ValidateQueryDecorator<FakeQueryWithoutValidator, string>), 
        registration.ImplementationType);
    Assert.Equal(Lifestyle.Transient, registration.Lifestyle);
}

您可以找到更多信息here https://simpleinjector.readthedocs.org/en/latest/diagnostics.html

请注意：我认为你有一个俘虏依赖 http://blog.ploeh.dk/2014/06/02/captive-dependency/- 你在单例装饰器中有一个瞬态处理程序......

[Fact]
public void Container_Always_ContainsNoDiagnosticWarnings()
{
    var container = this.ContainerFactory();

    container.Verify();

    var results = Analyzer.Analyze(container);

    Assert.False(results.Any());
}