Net Core集成测试：从其他程序运行Startup.cs和配置

我们正在创建一个集成单元测试 (Xunit)，它调用 Real Application Startup.cs。

由于某种原因，真实项目可以正确读取配置文件/属性，但是从集成测试运行它，它无法读取它。它没有将任何内容放入下面的配置（conf）变量中。我该如何解决这个问题？ 原因是它没有读取是因为它没有读取 Net Core 2.2 中新的内部依赖注入，它读取配置文件。尝试立即使用 .CreateDefaultBuilder。

集成测试1.cs

        TestServer _server = new TestServer(new WebHostBuilder() .UseContentRoot("C:\\RealProject\\RealProject.WebAPI")
            .UseEnvironment("Development")
            .UseConfiguration(new ConfigurationBuilder()
            .SetBasePath("C:\\RealProject\\RealProject.WebAPI")
                .AddJsonFile("appsettings.json")
                .Build())
                .UseStartup<Startup>()
            .UseStartup<Startup>());

真实项目Startup.cs

    public Startup(IConfiguration configuration, IHostingEnvironment hostingEnvironment)
    {
        Configuration = configuration;
        HostingEnvironment = hostingEnvironment;
    }

    public IHostingEnvironment HostingEnvironment { get; }
    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public IServiceProvider ConfigureServices(IServiceCollection services)
    {

        var conf = Configuration;
        IConfiguration appConf = conf.GetSection("ConnectionStrings");
        var connstring = appConf.GetValue<string>("DatabaseConnection");

        services.AddDbContext<DbContext>(a => a.UseSqlServer(connstring));

应用程序设置.Json

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "ConnectionStrings": {
    "DatabaseConnection": "Data Source=.;Initial Catalog=ApplicationDatabase;Integrated Security=True"
  }
}

您想要做的是为您的 WebApplication 创建一个采用 Startup 类型的工厂。然后您可以使用IClassFixture https://xunit.net/docs/shared-context#class-fixture接口与测试类中的所有测试共享该工厂的上下文。

这在实践中看起来是这样的：

public class CustomWebApplicationFactory<TStartup> : WebApplicationFactory<Startup> where TStartup : class
{
    public CustomWebApplicationFactory() { }

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder
            .ConfigureTestServices(
                services =>
                {
                    services.Configure(AzureADDefaults.OpenIdScheme, (System.Action<OpenIdConnectOptions>)(o =>
                    {
                        // CookieContainer doesn't allow cookies from other paths
                        o.CorrelationCookie.Path = "/";
                        o.NonceCookie.Path = "/";
                    }));
                }
            )
            .UseEnvironment("Production")
            .UseStartup<Startup>();
    }
}


public class AuthenticationTests : IClassFixture<CustomWebApplicationFactory<Startup>>
{
    private HttpClient _httpClient { get; }

    public AuthenticationTests(CustomWebApplicationFactory<Startup> fixture)
    {
        WebApplicationFactoryClientOptions webAppFactoryClientOptions = new WebApplicationFactoryClientOptions
        {
            // Disallow redirect so that we can check the following: Status code is redirect and redirect url is login url
            // As per https://learn.microsoft.com/en-us/aspnet/core/test/integration-tests?view=aspnetcore-2.2#test-a-secure-endpoint
            AllowAutoRedirect = false
        };

        _httpClient = fixture.CreateClient(webAppFactoryClientOptions);
    }

    [Theory]
    [InlineData("/")]
    [InlineData("/Index")]
    [InlineData("/Error")]
    public async Task Get_PagesNotRequiringAuthenticationWithoutAuthentication_ReturnsSuccessCode(string url)
    {
        // Act
        HttpResponseMessage response = await _httpClient.GetAsync(url);

        // Assert
        response.EnsureSuccessStatusCode();
    }
}

我跟着导游here https://fullstackmark.com/post/20/painless-integration-testing-with-aspnet-core-web-api让它在我自己的代码中工作。