Web API Nunit 测试未注入依赖项

Question

尝试对我的 Web api 项目进行单元测试时，出现错误

{[Message, An error has occurred.]} ExceptionMessage, An error occurred when trying to create a controller of type 'ExampleController'. Make sure that the controller has a parameterless public constructor. {[ExceptionType, System.InvalidOperationException]} {[StackTrace, at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request) at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()]} {[InnerException, System.Web.Http.HttpError]}

单元测试：

[TestFixtureSetUp]
public void TestsSetup()
{
    _server = HttpRequestHelper.SetupHttpServerDefault();
}

[Test]
public void CanGetAllAddresses()
{
    var client = new HttpClient(_server);

    var request = HttpRequestHelper.CreateRequest("memory/address", HttpMethod.Get, ConfigurationManager.AppSettings["KeyUser"], string.Empty, ConfigurationManager.AppSettings["SecretUser"]);
    using (HttpResponseMessage response = client.SendAsync(request).Result)
    {
        Assert.NotNull(response.Content);
    }
}

我正在一个涉及此逻辑的 nunit TestFixtureSetUp 函数中注册我的控制器：

public static HttpServer SetupHttpServerDefault()
{
    var config = new HttpConfiguration();
    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "memory/{controller}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );

    var container = new Container();
    container.Register<IAddressService, AddressService>();
    var services = GlobalConfiguration.Configuration.Services;
    var controllerTypes = services.GetHttpControllerTypeResolver().
            GetControllerTypes(services.GetAssembliesResolver());
    foreach (var controllerType in controllerTypes)
    {
      var registration = Lifestyle.Transient.
          CreateRegistration(controllerType, container);

      container.AddRegistration(controllerType, registration);

      registration.SuppressDiagnosticWarning
                   (DiagnosticType.DisposableTransientComponent, "");
    }
    container.Verify();
    GlobalConfiguration.Configuration.DependencyResolver = new 
                    SimpleInjectorWebApiDependencyResolver(container);
    return new HttpServer(config);
}

我的地址控制器是这样开始的：

public class AddressController : BaseController
{
    private readonly IAddressService _addressService;

    public AddressController(IAddressService addressService)
    {
        _addressService = addressService;
    }
}

当删除控制器参数时，我能够调试控制器，这告诉我我没有正确地将依赖项注入控制器。我查看了这个 post here ，它看起来很相似，但我不熟悉如何明确声明我的控制器。我尝试对我的服务使用类似的方法，但没有成功。

Answer 1

我的特定问题的解决方案实际上是在我在测试中创建的内存 HttpServer 和 GlobalConfiguration 上注册依赖项解析器。在问题的上方，您会看到 config 变量的创建，然后这是解决我的问题的代码：

config.DependencyResolver = new SimpleInjectorWebApiDependencyResolver(container); 
GlobalConfiguration.Configuration.DependencyResolver = 
                    new SimpleInjectorWebApiDependencyResolver(container);

没有 config.DependencyResolver 我无法通过以下方式连接到我的项目控制器：

using (HttpResponseMessage response = client.SendAsync(request).Result)

如果没有 GlobalConfiguration.Configuration.DependencyResolver，我无法在我的测试项目中联系本地服务。希望这对其他人有帮助！

Web API Nunit 测试未注入依赖项

Web API Nunit Tests not injecting dependencies

nunit

dependency-injection

simple-injector

asp.net-web-api