如何在单元测试中模拟 Cookie

Question

我有一个 MVC 控制器，我正在其中创建 cookie 并执行其余操作。我需要对这个方法进行单元测试。我不确定如何模拟 cookie。

这是我在控制器中的方法：

public ActionResult Login(LogInRequest logInRequest)
{
    if (ModelState.IsValid)
    {
        HttpCookie usercookie = new HttpCookie("usercookie");
        usercookie["UserName"] = logInRequest.UserName;
        usercookie["Password"] = logInRequest.Password;
        usercookie.Expires = DateTime.Now.AddMinutes(10);
        **Response.Cookies.Add(usercookie);**
        return RedirectToAction("search", "LoanDriver");
        .......
        return View(logInRequest);
    }

这一行 Response.Cookies.Add(usercookie);它给了我一个 Null 错误。当我追踪 cookie 时，它具有价值。

这是我的测试方法：

public void Web_Login_ShouldValidateUserAndLoginSuccessfully()
{
    using (var kernel = new NSubstituteMockingKernel())
    {
        // Setup the dependency incjection
        kernel.Load(new EntityFrameworkTestingNSubstituteModule());

        // Create test request data 
        var request = new LogInRequest { UserName = "test", Password = "test" };
        var fakeResponseHandler = new FakeResponseHandler();
        fakeResponseHandler.AddFakeResponse(new Uri("http://localhost/test"), new HttpResponseMessage(HttpStatusCode.OK));
        ConfigurationManager.AppSettings["SearchApiBaseUrl"] = "http://dev.loans.carfinance.com/internal";
        var server = new HttpServer(new HttpConfiguration(), fakeResponseHandler);
        var httpClient = new HttpClient(server);
        var controller = new LoanDriverController(httpClient);
        Fake.SetFakeContext(controller);
        var result = controller.Login(request);
        Assert.IsNotNull(result);
    }
}

我也尝试过将 cookie 添加到 Response 中，但没有成功并遇到同样的问题：

public static void SetFakeContext(this Controller controller)
{
    var httpContext = InitialiseFakeHttpContext();
    ControllerContext context = 
        new ControllerContext(new RequestContext(httpContext, new RouteData()), controller);
    controller.ControllerContext = context;
}

private static HttpContextBase InitialiseFakeHttpContext(string url = "")
{ 
    var HttpContextSub = Substitute.For<HttpContextBase>();
    var RequestSub = Substitute.For<HttpRequestBase>();
    var ResponseSub = Substitute.For<HttpResponseBase>();
    var serverUtilitySub = Substitute.For<HttpServerUtilityBase>();
    var itemsSub = Substitute.For<IDictionary>();
    HttpContextSub.Request.Returns(RequestSub);
    HttpContextSub.Response.Returns(ResponseSub);
    HttpContextSub.Server.Returns(serverUtilitySub);
    var cookie = Substitute.For<HttpResponseBase>();
    HttpContextSub.Response.Returns(cookie);
    return HttpContextSub;
}

Answer 1

我认为您可以通过在控制器中进行一些重构来处理这个问题，例如，您可以创建一个 ICookieManager 接口和一个 CookieManager class（此 class 包含添加 cookie 的逻辑，也实现了 ICookieManager 接口）然后你可以将这个 ICookieManager 添加为构造函数中的依赖项或作为属性然后你将能够在你的单元测试中模拟这个依赖项，就像这样：

public interface ICookieManager
    {
        void CreateUserCookie(string userName, string password, HttpResponseBase response, int expiration = 10);
    }

    public class CookieManager: ICookieManager
    {
        public void CreateUserCookie(string userName, string password, HttpResponseBase response, int expiration = 10)
        {
            HttpCookie usercookie = new HttpCookie("usercookie");
            usercookie["UserName"] = userName;
            usercookie["Password"] = password;
            usercookie.Expires = DateTime.Now.AddMinutes(expiration);
            response.Cookies.Add(usercookie);
        }
    }

在你的控制器中：

 public class YourController : Controller
    {
        public ICookieManager CookieManager { get; set; }

        public YourController()
        {
            CookieManager = new CookieManager();
        }

        public YourController(ICookieManager cookieManager)
        {
            CookieManager = cookieManager;
        }

        public ActionResult Login(LogInRequest logInRequest)
        {
            if (ModelState.IsValid)
            {
                CookieManager.CreateUserCookie(logInRequest.UserName, logInRequest.Password, Response);
                return RedirectToAction("search", "LoanDriver");
            }
        }


    }

在你的单元测试中：

public void Web_Login_ShouldValidateUserAndLoginSuccessfully()
    {
        using (var kernel = new NSubstituteMockingKernel())
        {
            // Setup the dependency incjection
            kernel.Load(new EntityFrameworkTestingNSubstituteModule());

            // Create test request data 
            var request = new LogInRequest { UserName = "test", Password = "test" };

            var fakeResponseHandler = new FakeResponseHandler();
            fakeResponseHandler.AddFakeResponse(new Uri("http://localhost/test"), new HttpResponseMessage(HttpStatusCode.OK));
            ConfigurationManager.AppSettings["SearchApiBaseUrl"] = "http://dev.loans.carfinance.com/internal";
            var server = new HttpServer(new HttpConfiguration(), fakeResponseHandler);
            var httpClient = new HttpClient(server);
            var controller = new LoanDriverController(httpClient);
            controller.CookieManager=mockOfYourCookieManager; //here you pass the instance of the mock or also you can passe it in the constructor of the controller.
            Fake.SetFakeContext(controller);
            var result = controller.Login(request);
            Assert.IsNotNull(result);
        }

如何在单元测试中模拟 Cookie

How Mock Cookie in Unit test

c#

cookies

asp.net-mvc

unit-testing

nsubstitute