c# - 如何将 Fitnesse 与 Autofac/IOC 集成？

Question

当 Fitnesse 实例化一个夹具时，它会寻找一个默认的公共(public)构造函数。

但是，我想在构造函数中注入(inject)我想在夹具中使用的任何应用程序服务。

即我想这样写我的装置......

public class MyColumnFixture : ColumnFixture {
    private readonly IApplicationService _applicationService;

    public ManualExitSetupFixture(IApplicationService applicationService) {
        _applicationService = applicationService;
    }

    public void DoStuff(string arg1) {
        _applicationService.DoStuff(arg1);
    }
}

到目前为止，我想出的最好办法是将容器公开为单例(见下文)。 但必须有更好的方法。 Autofac 与我们使用的许多其他技术完美集成。

public class AutofacIntegration {
    private static IContainer _container;

    public static IContainer Container {
        get {
           if (_container == null) {
              var builder = new ContainerBuilder();
              builder.RegisterModule<MyApplicationModule>();
               _container = builder.Build();                    
           }
           return _container;
         }
    }
}

public class MyColumnFixture : ColumnFixture {
    private readonly IApplicationService _applicationService;

    public ManualExitSetupFixture() {
        _applicationService = AutofacIntegration.Container.Resolve<IApplicationService>();
    }

    public void DoStuff(string arg1) {
        _applicationService.DoStuff(arg1);
    }
}

编辑:包括我在 Mike 的协助下尝试完成这项工作的更多细节......

我创建了一个类，它是从 Fitsharp 反编译的 CreateDefault 反编译代码中复制粘贴的...

public class CreateDefault<T, P> : Operator<T, P>, CreateOperator<T> where P : class, Processor<T>
{
    public bool CanCreate(NameMatcher memberName, Tree<T> parameters)
    {
        return true;
    }

    public TypedValue Create(NameMatcher memberName, Tree<T> parameters)
    {
        ...
    }
}

...并在 SuiteConfig.xml 中注册...

<suiteConfig>
    <ApplicationUnderTest>
        <AddAssembly>..\..\Services\Win\MyProj.Fitnesse\MyProj.Fitnesse\bin\Debug\MyProj.Fitnesse.dll</AddAssembly>
     </ApplicationUnderTest>
     <Fit.Operators>
         <Add>MyProj.Fitnesse.CreateDefault`2</Add>
     </Fit.Operators>
</suiteConfig>

...这会在尝试加载我的 CreateDefault<,> 类时出现以下异常。

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> fitSharp.Machine.Exception.CreateException: Constructor with 0 parameter(s) failed for type 'MyProj.Fitnesse.CreateDefault`2'. ---> System.ArgumentException: Cannot create an instance of MyProj.Fitnesse.CreateDefault`2[T,P] because Type.ContainsGenericParameters is true.
   at System.RuntimeType.CreateInstanceCheckThis()
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Reflection.Assembly.CreateInstance(String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at fitSharp.Machine.Engine.RuntimeType.CreateInstance()
   at fitSharp.Machine.Engine.CreateDefault`2.CreateWithoutParameters(RuntimeType runtimeType)
   --- End of inner exception stack trace ---
   at fitSharp.Machine.Engine.CreateDefault`2.CreateWithoutParameters(RuntimeType runtimeType)
   at fitSharp.Machine.Engine.CreateDefault`2.Create(NameMatcher memberName, Tree`1 parameters)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at fitSharp.Machine.Engine.MethodMember.TryInvoke(Object[] parameters)
   at fitSharp.Machine.Engine.ReflectionMember.Invoke(Object[] parameters)
   at fitSharp.Machine.Engine.ProcessorBase`2.Operate[O](Object[] parameters)
   at fitSharp.Machine.Engine.Operators`2.Add(String operatorName)
   --- End of inner exception stack trace ---
   at fitSharp.Machine.Engine.ProcessorExtension.InvokeWithThrow[T](Processor`1 processor, TypedValue instance, MemberName memberName, Tree`1 parameters)
   at fitSharp.Machine.Application.SuiteConfiguration.LoadNode(String typeName, XmlNode methodNode)
   at fitSharp.Machine.Application.SuiteConfiguration.LoadXml(String configurationXml)
   at fitSharp.Machine.Application.ArgumentParser.InvokeArgumentHandler(String switch, String argumentValue)
   at fitSharp.Machine.Application.ArgumentParser.Parse(IList`1 commandLineArguments)
   at fitSharp.Machine.Application.Shell.Run(IList`1 commandLineArguments)

编辑:非常感谢迈克，这现在正在发挥作用。

实现真的很简单，我相信它可以改进，但这里有一个快速的操作方法......

1. 定义一个自定义的 CreateOperator
2. 创建 SuiteConfig.xml 以指向 dll 并加载自定义创建运算符
3. 启动运行器时指定 SuiteConfig
4. 注册灯具

我的 CreateOperator 代码...

public class AutofacCreateOperator : CellOperator, CreateOperator<Cell>
{
    private static IContainer _container;

    public AutofacCreateOperator()
    {
        var builder = new ContainerBuilder();
        builder.RegisterModule<FitnesseModule>();
        _container = builder.Build();
    }

    public bool CanCreate(NameMatcher memberName, Tree<Cell> parameters)
    {
        return _container.ComponentRegistry.IsRegistered(new TypedService(Type.GetType(memberName.MatchName)));
    }

    public TypedValue Create(NameMatcher memberName, Tree<Cell> parameters)
    {
        return new TypedValue(_container.Resolve(Type.GetType(memberName.MatchName)));
    }
}

Answer 1

这可以做到——您需要编写一个自定义类来处理 fitSharp 的创建操作。它将实现这个接口(interface):

public interface CreateOperator<T> {
    bool CanCreate(NameMatcher memberName, Tree<T> parameters);
    TypedValue Create(NameMatcher memberName, Tree<T> parameters);
}

然后你告诉 fitSharp 在套件配置文件中使用这个类:

<suiteConfig>
    <Fit.Operators>
        <Add>My.Create.Operator</Add>
    </Fit.Operators>
    ...
</suiteConfig>

作为陈述点，这里有一个非常简单的创建运算符。您将对其进行修改以进行 AutoFac 注入(inject)。

public class TestCreateOperator: CellOperator, CreateOperator<Cell> {
  public bool CanCreate(NameMatcher memberName, Tree<Cell> parameters) {
    return memberName.Matches("testname");
  }
  public TypedValue Create(NameMatcher memberName, Tree<Cell> parameters) {
    return new TypedValue("mytestname");
  }
}

仅供引用，这是创建夹具的内置类。

public class CreateDefault<T,P>: Operator<T, P>, CreateOperator<T> where P: class, Processor<T> {
    public bool CanCreate(NameMatcher memberName, Tree<T> parameters) {
        return true;
    }

public TypedValue Create(NameMatcher memberName, Tree<T> parameters) {
    var runtimeType = Processor.ApplicationUnderTest.FindType(memberName);
    return parameters.Branches.Count == 0
                 ? CreateWithoutParameters(runtimeType)
                 : CreateWithParameters(parameters, runtimeType);
}

static TypedValue CreateWithoutParameters(RuntimeType runtimeType) {
    try {
        return runtimeType.CreateInstance();
    }
    catch (System.Exception e) {
        throw new CreateException(runtimeType.Type, 0, e.InnerException ?? e);
    }
}

TypedValue CreateWithParameters(Tree<T> parameters, RuntimeType runtimeType) {
    RuntimeMember member = runtimeType.GetConstructor(parameters.Branches.Count);
    object[] parameterList = new ParameterList<T>(Processor).GetParameterList(TypedValue.Void, parameters, member);
        try {
            return member.Invoke(parameterList);
        }
        catch (System.Exception e) {
            throw new CreateException(runtimeType.Type, parameterList.Length, e.InnerException ?? e);
        }
    }
}