Nop中的Fake类

 

1.Nop提供了完整的FakeHttpContext实现，如图

 

1.FakeHttpContext的作用。

控制器进行单元测试时模拟web上下文环境，还有一些其他对HttpContext有依赖的组件也可以使用Fake从而进行组件的单元测试。

 

2.例举Nop中使用到FakeHttpContext的地方

(1).NopEngine(初始化NopEngine时，是web环境就注册真实HttpContext，否则注册FakeHttpContext)

//HTTP context and other related stuff

            builder.Register(c => 

                //register FakeHttpContext when HttpContext is not available

                HttpContext.Current != null ?

                (new HttpContextWrapper(HttpContext.Current) as HttpContextBase) :

                (new FakeHttpContext("~/") as HttpContextBase))

                .As<HttpContextBase>()

                .InstancePerHttpRequest();

            builder.Register(c => c.Resolve<HttpContextBase>().Request)

                .As<HttpRequestBase>()

                .InstancePerHttpRequest();

            builder.Register(c => c.Resolve<HttpContextBase>().Response)

                .As<HttpResponseBase>()

                .InstancePerHttpRequest();

            builder.Register(c => c.Resolve<HttpContextBase>().Server)

                .As<HttpServerUtilityBase>()

                .InstancePerHttpRequest();

            builder.Register(c => c.Resolve<HttpContextBase>().Session)

                .As<HttpSessionStateBase>()

                .InstancePerHttpRequest();

 

(2)RoutesTests( Route依赖HttpContextBase，可以用Fake类代替 )

[Test]

        public void Blog_routes()

        {

            //TODO why does it pass null instead of "new BlogPagingFilteringModel()" as it's done in real application? The same is about issue is in the other route test methods

            "~/blog/".ShouldMapTo<BlogController>(c => c.List(null));

            "~/blog/rss/1".ShouldMapTo<BlogController>(c => c.ListRss(1));

            "~/blog/2/".ShouldMapTo<BlogController>(c => c.BlogPost(2));

            "~/blog/2/test-se-name".ShouldMapTo<BlogController>(c => c.BlogPost(2));

            //TODO validate properties such as 'Tag' or 'Month' in the passed BlogPagingFilteringModel. The same is about issue is in the other route test methods

            //"~/blog/tag/sometag".ShouldMapTo<BlogController>(c => c.List(new BlogPagingFilteringModel() { Tag = "sometag" }));

            //"~/blog/month/3".ShouldMapTo<BlogController>(c => c.List(new BlogPagingFilteringModel() { Month = "4" }));

        }

 

(3)其他组件，如WebHelperTests，AdminAuthorizeAttributeTests都依赖了HttpContextBase

 

总结：这些Fake类为单元测试提供了模拟的Web上下文环境。，再也不用担心控制器以及类库因为用了HttpContextBase（最常见的包括Session，Request，Response）而变得难以进行单元测试了（但在控制器中还是应该尽量少用这些）