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如何正确配置模拟依赖项以使用Autofac测试Web Api(ASP.NET Core)控制器

xunit autofac asp.net-core testing

itim · 技术社区 · 7 年前

Autofac Microsoft.AspNetCore.TestHost.TestServer 用于集成测试。然而,对于一些测试场景,我希望注入一些服务模拟,而不是加载到中的实现 ConfigureContainer http://docs.autofac.org/en/latest/integration/aspnetcore.html#quick-start-with-configurecontainer ).

public class Program
{
    public static void Main(string[] args)
    {
        var host = new WebHostBuilder()
            .UseKestrel()
            .ConfigureServices(s => s.AddAutofac())
            .UseStartup<Startup>()
            .Build();

        host.Run();
    }
}

public class Startup
{
    ...
    public void ConfigureContainer(ContainerBuilder builder)
    {
        builder.RegisterModule(new Modules.ApiModule());
    }
    ...
}

和测试类:

public class BasicControllerTests
{
    TestServer server;
    HttpClient client;

    public BasicControllerTests()
    {
        var resellerRepo = new Mock<IResellerProvider>();
        resellerRepo.Setup(a => a.Query())
            .Returns(new[] {
            new Model.Reseller
            {
                Id = Guid.NewGuid(),
                Code = "R1",
                Name = "Reseller 1"
            }
            }.AsQueryable());

        // How to inject mock properly in the lines below?

        server = new TestServer(new WebHostBuilder()
            .ConfigureServices(a => a.AddAutofac())
            .UseStartup<Startup>());

        client = server.CreateClient();
    }
   ...

我想做的是使用 TestServer IResellerProvider 模拟如测试示例中所示。实现这一点的最佳方式是什么?当然,我可以创建一个 TestStartup 我想知道处理这种情况的正确方法是什么。

1 回复 | 直到 7 年前

TheMyrel 5 年前

我找到了一个解决方法,它可以很好地工作,并允许您在其中注入任何其他依赖项。net core api。您将在测试中启动此标准代码

var clientFactory = new WebApplicationFactory<Startup>();
var client = clientFactory.WithWebHostBuilder(builder =>
builder.ConfigureTestServices(services =>
{

}));

var _httpClient = client.CreateClient();

RemoveVehicleServiceRegistrationFrom(services);
services.AddScoped<IVehicleService, FakeVehicleService>();

在Remove方法中,您只需要查找并删除旧注册。像这样的

private static void RemoveVehicleServiceRegistrationFrom(IServiceCollection services)
{
     var vehicleService = services.Single(x => x.ServiceType == typeof(IVehicleService));
     services.Remove(vehicleService);
}

最终版本如下所示

private HttpClient _httpClient;

[OneTimeSetUp]
public void Setup()
{
    var clientFactory = new WebApplicationFactory<Startup>();
    var client = clientFactory.WithWebHostBuilder(builder =>
        builder.ConfigureTestServices(services =>
        {
            RemoveVehicleServiceRegistrationFrom(services);
            services.AddScoped<IVehicleService, FakeVehicleService>();
        }));

    var _httpClient = client.CreateClient();
}

private static void RemoveVehicleServiceRegistrationFrom(IServiceCollection services)
{
    var vehicleService = services.Single(x => x.ServiceType == typeof(IVehicleService));
    services.Remove(vehicleService);
}