3

我正在尝试为使用Saturn 框架构建的小型 API 构建一些集成测试。

API 是使用常用的计算表达式构建的，例如Saturn,application等。controllerrouter

但是为了构建集成测试，我需要替换application计算表达式 (ce) 并手工制作WebHostBuilder.

我的applicationce 看起来像这样：

module Server 

let app =
    application {
        url ("http://0.0.0.0:" + port.ToString() + "/")
        use_router apiRouter
        memory_cache
        service_config configureSerialization
        use_gzip
        use_config (fun _ ->
            System.Environment.CurrentDirectory <- (System.Reflection.Assembly.GetExecutingAssembly()).Location
                                                   |> Path.GetDirectoryName
            let configurationRoot =
                ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                    .AddJsonFile("appSettings.json")
                    .Build()
            let appConfig = FsConfig.AppConfig(configurationRoot)

            let dbPath =
                match appConfig.Get<AppSettings>() with
                | Ok settings when settings.DbConfig.Database.Contains(":memory:") -> settings.DbConfig.Database
                | Ok settings -> Path.Combine(System.Environment.CurrentDirectory, settings.DbConfig.Database)
                | Error _ -> failwithf "Invalid database path"
            { connectionString = dbPath |> sprintf "DataSource=%s;Version=3" })
    }

带有一个router和controllers...

let cartController =
    controller {
        create createCartAction
        show getCartAction
        delete deleteCartAction
        subController "/items" cartItemsController
    }

let apiRouter =
    router {
        not_found_handler (setStatusCode 404 >=> text "Not found")
        pipe_through apiPipeline
        forward "/cart" cartController
    }

上面的代码在我的 API 项目中，下面带有集成测试的代码在第二个项目中。后者对前者有项目参考。

let configureApp (app : IApplicationBuilder) =
    app.UseGiraffe(Server.apiRouter) \\<-- The problem is here. Server.apiRouter is null!

let configureServices (services : IServiceCollection) =
    services.AddGiraffe() |> ignore

let builder = WebHostBuilder()
                .UseContentRoot(contentRoot) 
                .Configure(Action<IApplicationBuilder> configureApp)
                .ConfigureServices(configureServices)

let testServer = new TestServer(builder)

let client = testServer.CreateClient()

let! response = client.GetAsync "/"

test <@ HttpStatusCode.OK = response.StatusCode @>

运行测试时，它会失败并出现以下异常：

System.InvalidOperationException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'A suitable constructor for type 'Giraffe.Middleware+GiraffeMiddleware' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.'

问题似乎与线路有关app.UseGiraffe(Server.apiRouter)。apiRouter是在 API 项目的模块中定义的Server——但是当这段代码在测试项目中运行时Server.apiRouter是null.

但是，如果我将测试代码移动到与 - 测试代码相同的项目中，API则测试工作完美。

如果从测试项目中调用 apiRouter计算表达式，为什么会这样？null

4

1 回答 1

0

事实证明，这根本无关紧要Saturn。这一切都与F#发起的方式有关modules。答案可以在这里找到

正如引用的帖子中所建议的那样。我只是添加了一个[<EntryPoint>]功能，一切都按预期工作。

于 2019-06-23T15:38:38.833 回答