管理通过AutoFixture在通用测试助手中输入MVC控制器的服务

Question

我是AutoFixture的新手,我正试图在我的测试环境中为团队中较少TDD的开发者创建一个友好的扩展.这是代码:

public class HomeController : Controller
{
    private readonly ISomeService _someService;

    public HomeController(ISomeService someService)
    {
        _someService = someService;
    }

    public ActionResult Index()
    {
        _someService.SomeMethod();
        return View("Index");
    }
}

public class ControllerContext<T> where T : Controller
{
    protected static T ControllerUnderTest;
    private static IFixture _fixture;

    public ControllerContext()
    {
        _fixture = new Fixture().Customize(new AutoMoqCustomization());
        _fixture.Customize<ControllerContext>(c => c.Without(x => x.DisplayMode));
        ControllerUnderTest = _fixture.Create<T>();
    }

    protected static Mock<TDouble> For<TDouble>() where TDouble : class
    {
        //var mock = _fixture.Create<TDouble>();
        var mock = _fixture.Create<Mock<TDouble>>();
        return mock;
    }
}

所以扩展是For方法 - 当我检查ControllerUnderTest哪个有一个注入'ISomeService'它有一个实例注入就好了,它肯定会调用我声明的方法.当我检查在'For'方法中创建的模拟时,它看起来与注入控制器的模型相同,但它不会Verif!

public class EXAMPLE_When_going_to_home_page : ControllerContext<HomeController>
{
    Because of = () =>
    {
        ControllerUnderTest.Index();

    };

    It should_do_something = () =>
    {
        //This throws a 'Invocation was not performed'
        For<ISomeService>().Verify(x => x.SomeMethod());
    };

    Establish context = () =>
    {

    };
}

我正在努力寻找有人做类似事情的任何例子,我知道我肯定在做一些愚蠢的事情,但在我脑海中这个测试应该通过？

Answer 1

Create每次创建一个新的匿名实例,除非你冻结(通过.Freeze<T>()或AutoFixture.Xunit [Frozen])一个实例.这意味着注入的值HomeController与返回的值不同For.

有几种可能的解决方案,所有这些解决方案最终都将涉及冻结价值或注入要使用的价值.

一个例子看起来像这样:

public class ControllerContext<T> where T : Controller
{
    private static Lazy<T> _controllerFactory;
    private static IFixture _fixture;

    public ControllerContext()
    {
        _fixture = new Fixture().Customize(new AutoMoqCustomization());
        _fixture.Customize<ControllerContext>(c => c.Without(x => x.DisplayMode));
        _controllerFactory = new Lazy<T>(() => _fixture.Create<T>());
    }

    protected static Mock<TDouble> For<TDouble>() where TDouble : class
    {
        var mock = _fixture.Freeze<Mock<TDouble>>();
        return mock;
    }

    protected static T ControllerUnderTest
    {
        get { return _controllerFactory.Value; }
    }
}

public class EXAMPLE_When_going_to_home_page : ControllerContext<HomeController>
{
    static Mock<ISomeService> SomeService;

    Because of = () =>
    {
        SomeService = For<ISomeService>();
        ControllerUnderTest.Index();
    };

    It should_do_something = () =>
    {
        //This throws a 'Invocation was not performed'
        SomeService.Verify(x => x.SomeMethod());
    };

    Establish context = () =>
    {

    };
}

这个改变版本的重点是首先Freeze在服务模拟上调用,然后才创建控制器的匿名实例.由于For现在使用该方法的方式,您可能应该将其重命名为GetService.