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ASP.NET5使用TestServer進行單元測試

2019-11-14 14:34:55
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之前如果對 asp.net WebAPI 進行單元測試(HttpClient 發起請求,并且可調試 WebAPI),一般采用 Owin 的方式,具體參考:《開發筆記:用 Owin Host 實現脫離 IIS 跑 Web API 單元測試》

示例代碼:

public class ValuesWebApiTest : IDisposable{    PRivate const string HOST_ADDRESS = "http://localhost:8001";    private IDisposable _webApp;    private HttpClient _httClient;    public AdTextUnitWebApiTest()    {        _webApp = WebApp.Start<Startup>(HOST_ADDRESS);        Console.WriteLine("Web API started!");        _httClient = new HttpClient();        _httClient.BaseAddress = new Uri(HOST_ADDRESS);        Console.WriteLine("HttpClient started!");    }    [Fact]    public async Task Get()    {        var response = await _httClient.GetAsync("/api/values");        if (response.StatusCode != HttpStatusCode.OK)        {            Console.WriteLine(response.StatusCode);            Console.WriteLine((await response.Content.ReadAsAsync<HttpError>()).ExceptionMessage);        }        Assert.Equal(HttpStatusCode.OK, response.StatusCode);        var test = await response.Content.ReadAsStringAsync();        Console.WriteLine(await response.Content.ReadAsStringAsync());    }    public void Dispose()    {        _httClient.Dispose();        _webApp.Dispose();    }}

本來想在 ASP.NET 5 WebAPI 項目中,也用這一套測試代碼,但發現并不適用,因為 ASP.NET WebAPI 2 和 ASP.NET 5 WebAPI 并不是特別一樣,比如 Startup.cs 的配置等等,之前使用 WebApp.Start<Startup>(HOST_ADDRESS) 的方式啟動 WebAPI 項目,而 ASP.NET 5 WebAPI 變成了這樣的:

public static void Main(string[] args) => Webapplication.Run<Startup>(args);

想用 WebApplication.Run 的方式替換掉 WebApp.Start,但發現并不可行,比如 args 的參數問題,自己想的有點簡單了,后來 Google 搜索了一些資料,發現 ASP.NET 5 增加了 TestServer,自己找資料配置了很久,看別人的示例代碼很簡單,但我運行的時候就是各種報錯,主要原因是程序包的版本不對,因為我是按照 project.json 的提示安裝的,比如 Microsoft.AspNet.TestHost 這個程序包,提示最新版本為 1.0.0-rc2-15960,并且沒有 1.0.0-rc1-final 版本,然后我就安裝提示安裝的 rc2,就報下面的異常:

異常信息:Could not load type 'Microsoft.AspNet.Builder.RequestDelegate' from assembly 'Microsoft.AspNet.Http.Abstractions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

根據提示,我以為異常原因是沒有加載 Microsoft.AspNet.Http.Abstractions 程序集,然后又添加此程序集,重新運行發現還是報錯。。。后面具體的過程就不記錄了,反正坑很大,根本原因是 Microsoft.AspNet.TestHost 程序包的版本不對,應該安裝 1.0.0-rc1-final 版本,我是后來無意間重啟 VS2015 發現的。

下面貼一下 ASP.NET 5 進行單元測試的一些代碼。

首先 ASP.NET 5 WebAPI 項目 Startup.cs 配置代碼:

using Microsoft.AspNet.Builder;using Microsoft.AspNet.Hosting;using Microsoft.Extensions.Configuration;using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Logging;namespace Demo.WebApi{    public class Startup    {        public Startup(IHostingEnvironment env)        {            // Set up configuration sources.            var builder = new ConfigurationBuilder()                .AddJsonFile("appsettings.json")                .AddEnvironmentVariables();            Configuration = builder.Build();        }        public IConfigurationRoot Configuration { get; set; }        // This method gets called by the runtime. Use this method to add services to the container.        public void ConfigureServices(IServiceCollection services)        {            // Add framework services.            services.AddMvc();        }        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)        {            loggerFactory.AddConsole(Configuration.GetSection("Logging"));            loggerFactory.AddDebug();            app.UseIISPlatformHandler();            app.UseStaticFiles();            app.UseMvc();        }        // Entry point for the application.        public static void Main(string[] args) => WebApplication.Run<Startup>(args);    }}

ValuesWebApiTest 測試代碼:

using Microsoft.AspNet.Hosting;using Microsoft.AspNet.TestHost;using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Logging;namespace Demo.WebApiTests{    public class ValuesWebApiTest    {        public TestServer _server;        public ValuesWebApiTest()        {            _server = TestServer.Create(app =>            {                var env = app.ApplicationServices.GetRequiredService<IHostingEnvironment>();                var loggerFactory = app.ApplicationServices.GetRequiredService<ILoggerFactory>();                new CNBlogs.Ad.WebApi.Startup(env).Configure(app, env, loggerFactory);            }, services =>            {                services.AddMvc();                services.Configure();            });        }    }    [Fact]    public async Task Get()    {        var response = await _server.CreateClient().GetAsync("/api/values");        if (response.StatusCode != HttpStatusCode.OK)        {            Console.WriteLine(response.StatusCode);            Console.WriteLine((await response.Content.ReadAsAsync<HttpError>()).ExceptionMessage);        }        Assert.Equal(HttpStatusCode.OK, response.StatusCode);        var test = await response.Content.ReadAsStringAsync();        Console.WriteLine(await response.Content.ReadAsStringAsync());    }}

project.json 配置代碼:

{  "frameworks": {    "dnx451": { }  },  "dependencies": {    "Microsoft.AspNet.Mvc.WebApiCompatShim": "6.0.0-rc1-final",    "Microsoft.Net.Http": "2.2.29",    "Microsoft.AspNet.TestHost": "1.0.0-rc1-final",    "xunit": "2.1.0",    "xunit.runner.dnx": "2.1.0-rc1-build204"  },  "commands": {    "test": "xunit.runner.dnx"  }}

運行測試成功,并且可以 Debug 調試,需要注意 using 引用(沒用的我都去掉了),還有程序包的版本號。

參考資料:

  • Integration testing ASP.NET 5 and ASP.NET MVC 6 applications | StrathWeb. A free flowing web tech monologue.
  • Writing integration tests for ASP.NET 5
  • Testing asp.net 5 vnext middleware from a TestServer - Stack Overflow

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