使用 Unity IoC 进行 MVC 集成测试

Question

在使用基于构造函数的 DI 之后，我正在尝试 Unity IoC。 问题是试图让集成测试工作。

http://patrick.lioi.net/2013/06/20/streamlined-integration-tests/

“运行集成测试应尽可能多地使用真实系统”

Patrick 上面描述了在 MVC 单元测试项目中设置 IoC。但我不知道如何实现

public class HomeController : Controller
{
    readonly IWinterDb db;

    // Unity knows that if IWinterDb interface is asked for, it will inject in a new WinterDb()
    public HomeController(IWinterDb db)
    {
        this.db = db;
    }

    public ActionResult Index()
    {
        var stories = db.Query<Story>()
                        .OrderByDescending(s => s.Rating)
                        .Include(s => s.StoryType);

        return View(stories);
    }

单元测试没问题，假的通过了：

[TestMethod]
public void Index_GivenFake_ShouldReturn100Stories()
{
    var db = new FakeWinterDb();
    db.AddSet(TestData.Stories);
    var controller = new HomeController(db);

    var result = controller.Index() as ViewResult;
    var model = result.Model as IEnumerable<Story>;

    Assert.AreEqual(100, model.Count());
}

但是我喜欢测试整个堆栈的集成测试：

//Integration tests depend on the test data inserted in migrations
[TestClass]
public class HomeControllerTestsIntegration
{
    [TestMethod]
    public void Index_GivenNothing_ResultShouldNotBeNull()
    {
        var controller = new HomeController();

        var result = controller.Index() as ViewResult;

        Assert.IsNotNull(result);
    }

问题：这不会编译（因为没有无参数构造函数）。并且没有调用 Unity 来为 HomeController 注入正确的依赖项。

团结起来：

public static class UnityConfig
{
    public static void RegisterComponents()
    {
        var container = new UnityContainer();

        // register all your components with the container here
        // it is NOT necessary to register your controllers

        container.RegisterType<IWinterDb, WinterDb>();

        // for authentication
        container.RegisterType<AccountController>(new InjectionConstructor());

        DependencyResolver.SetResolver(new UnityDependencyResolver(container));
    }
}

编辑1：

[TestMethod]
public void Index_GivenNothing_ResultShouldNotBeNull()
{
    UnityConfig.RegisterComponents(); 
    var controller = UnityConfig.container.Resolve<HomeController>();

    var result = controller.Index() as ViewResult;

    Assert.IsNotNull(result);
}

确保单例存在。

public static class UnityConfig
{
    public static UnityContainer container;

    public static void RegisterComponents()
    {
        container = new UnityContainer();

        // register all your components with the container here
        // it is NOT necessary to register your controllers

        //container.RegisterType<IWinterDb, WinterDb>();

        container.RegisterTypes(
            AllClasses.FromLoadedAssemblies(),
            WithMappings.FromMatchingInterface, // Convention of an I in front of interface name
            WithName.Default
            );  // Default not a singleton in Unity

        // for authentication
        container.RegisterType<AccountController>(new InjectionConstructor());

        DependencyResolver.SetResolver(new UnityDependencyResolver(container));
    }
}

将 Unity 暴露给测试项目

Answer 1

您需要通过容器解析您的控制器，以便 Unity 为您解析依赖项。

这可能就像替换这个一样简单：

var controller = new HomeController();

用这个：

var controller = container.Resolve<HomeController>();

你显然需要将你的容器暴露给你的测试类。这是您在连接生产代码时通常不会做的事情。