如何在單元測試中模擬Cookie

Question

我有一個MVC控制器，正在其中創建cookie並執行其余的操作。 我需要對該方法進行單元測試。 我不確定如何模擬Cookie。

這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);
    }

在這一行中Response.Cookies.Add（usercookie）; 它給我一個錯誤，為空。 當我跟蹤cookie時，它具有價值。

這是我的測試方法：

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);
    }
}

我也嘗試將Cookie添加到Response中，但是卻無法正常工作：

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

我認為您可以通過在控制器中進行一些重構來處理此問題，例如，您可以創建一個ICookieManager接口和一個CookieManager類（此類包含添加cookie的邏輯，還實現了ICookieManager接口），那么您可以添加此將ICookieManager作為構造函數中的依賴項或作為屬性，然后可以在單元測試中模擬此依賴項，如下所示：

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);
        }
    }

在您的控制器中：

 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");
            }
        }


    }

在單元測試中：

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);
        }