WebApi2 中的单元测试属性路由

Question

我正在处理一个 WebApi2 属性路由项目，我正在尝试对路由进行单元测试（请求正在控制器中执行正确的 api 方法）。但是到目前为止我无法让它工作...

它似乎没有获取属性中定义的路由知道可能有什么问题或遗漏了什么吗？

提前致谢！吉列尔莫.

这是我的单元测试代码：

var config = new HttpConfiguration
{
    IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always,
};

config.Routes.MapHttpRoute(name: "Default", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional });

request = new HttpRequestMessage(HttpMethod.Get, "http://localhost/api/homes/report");
route = config.Routes.MapHttpRoute("DefaultApi", "api/{controller}/{id}");
routeData = new HttpRouteData(route, new HttpRouteValueDictionary
    {
        { "controller", "homes" },
    });

config.MapHttpAttributeRoutes();
config.EnsureInitialized();

controller = new HomesController
{
    Catalog = catalog.Object,
    ControllerContext = new HttpControllerContext(config, routeData, request),
    Request = request,
};

controller.Request.Properties[HttpPropertyKeys.HttpConfigurationKey] = config;

var routeTester = new RouteTester(config, request, controller.ControllerContext);

Assert.IsTrue(routeTester.CompareSignatures(ReflectionHelpers.GetMethodInfo((HomesController p) => p.GetHomesReport())));

RouteTester.cs

public class RouteTester
{
    readonly HttpConfiguration config;
    readonly HttpRequestMessage request;
    readonly IHttpRouteData routeData;
    readonly IHttpControllerSelector controllerSelector;
    readonly HttpControllerContext controllerContext;

    public RouteTester(HttpConfiguration conf, HttpRequestMessage req, HttpControllerContext context)
    {
        config = conf;
        request = req;
        controllerContext = context;
        routeData = context.RouteData;

        controllerSelector = new DefaultHttpControllerSelector(config);
    }

    public string GetActionName()
    {
        if (controllerContext.ControllerDescriptor == null)
            GetControllerType();

        var actionSelector = new ApiControllerActionSelector();
        var descriptor = actionSelector.SelectAction(controllerContext);

        return descriptor.ActionName;
    }

    public Type GetControllerType()
    {
        var descriptor = controllerSelector.SelectController(request);
        controllerContext.ControllerDescriptor = descriptor;
        return descriptor.ControllerType;
    }

    public bool CompareSignatures(MethodInfo method)
    {
        if (controllerContext.ControllerDescriptor == null)
            GetControllerType();


        var actionSelector = new ApiControllerActionSelector();
        var x = actionSelector.GetActionMapping(controllerContext.ControllerDescriptor)[request.Method.ToString()];


        return x.Any(item => ((MethodBase)(((ReflectedHttpActionDescriptor)item).MethodInfo)).ToString() == ((MethodBase)method).ToString());
    }

ReflectionHelpers.cs

 public class ReflectionHelpers
{
    public static string GetMethodName<T, U>(Expression<Func<T, U>> expression)
    {
        var method = expression.Body as MethodCallExpression;

        if (method != null)
            return method.Method.Name;

        throw new ArgumentException("Expression is wrong");
    }

    public static MethodInfo GetMethodInfo<T, U>(Expression<Func<T, U>> expression)
    {
        var method = expression.Body as MethodCallExpression;
        if (method != null)
            return method.Method;


        throw new ArgumentException("Expression is wrong");
    }


    public static MethodInfo GetMethodInfo<T>(Expression<Action<T>> expression)
    {
        var method = expression.Body as MethodCallExpression;
        if (method != null)
            return method.Method;


        throw new ArgumentException("Expression is wrong");
    }
}

控制器片段

[Route("api/homes/homereport")]
public void GetHomesReport()
{
    var homeReportItems = HomeReport();
}

Answer 1

不确定这是否正是您问题的解决方案，但我使用这种方法来控制属性路由。它强制您指定控制器 class 和方法签名，但都没有字符串文字，因此您可以在此处获得良好的编译时间验证。一个简单方法的 FunctionSignature 作为 public 字符串 Action(int value) 它看起来像这样 Func<int, string>.

测试方法如下所示：

public void TestMethod() {
    var info = GetEndpointInfo<ControllerClass, FunctionSignature>(c => c.Action);

    Assert.IsNotNull(info.AllowsAnonymous);
    Assert.AreEqual("data/places/{query}", info.Route);
}

这是获取元信息的一些 lambda 和反射暴力：

private EndpointInfo GetEndpointInfo<TController, TMethod>(Expression<Func<TController, TMethod>> expression) {
    var controllerType = typeof(TController);
    var prefix = controllerType.GetCustomAttribute<RoutePrefixAttribute>().Prefix;
    MethodInfo methodInfo = GetMemberInfo(expression);
    var template = methodInfo.GetCustomAttribute<RouteAttribute>().Template;

    var info = new EndpointInfo() {
        AllowsAnonymous = controllerType.GetCustomAttribute<AllowAnonymousAttribute>() != null, //etend here to check method level attr
        Route = prefix + "/" + template
    };
    return info;
}

private MethodInfo GetMemberInfo<TController, TMethod>(Expression<Func<TController, TMethod>> expression) {
    var unaryExpression = expression.Body as UnaryExpression;
    var methodCall = unaryExpression.Operand as MethodCallExpression;
    var constant = methodCall.Object as ConstantExpression;
    var methodInfo = constant.Value as MethodInfo;
    return methodInfo;
}
class EndpointInfo{
    public bool AllowsAnonymous { get; set; }
    public string Route { get; set; }
}

希望对您有所帮助。

WebApi2 中的单元测试属性路由

Unit testing attribute routing in WebApi2

asp.net-web-api

asp.net-web-api-routing

asp.net-web-api2