如何在SimpleInjector 2.6.1+中单元测试开放的通用装饰器链

时间:2014-12-27 15:42:11

标签: c# unit-testing decorator simple-injector open-generics

使用SimpleInjector给出以下开放式通用deocrator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此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。似乎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(意思是,它返回typeof(QueryNotNullDecorator<HandleFakeQueryWithoutValidator,string>)而不是typeof(HandleFakeQueryWithoutValidator)

此外,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,如果没有,我们如何使用SimpleInjector 2.6.1 +单元测试开放的通用装饰器链?

2 个答案:

答案 0 :(得分:3)

依赖图的可用细节在2.6中有了很大的改进。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

请注意:我认为你有一个captive dependency - 你在单件装饰器里面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());
}

答案 1 :(得分:3)

Qujck是对的。我们极大地改进了注册和KnownDependency图的构建方式,特别是改进了诊断并使用户更容易查询注册。所以这不是一个bug;这是一个突破性的变化。然而,我们没想到任何人会受到这种影响,这就是为什么我们在次要版本中进行了更改。对不起,你不得不偶然发现这个变化,但至少它只是破坏的测试代码。

在以前的版本中,当添加了装饰器时,KnownDependency对象的图形被展平。这使得难以查询和可视化对象图。在v2.6中,从诊断API的角度来看,就好像装饰器是“真正的”注册。这意味着InstanceProducer和Registration对象现在显示返回的真实类型及其生活方式。

更清楚,但诊断API发生了重大变化。