c# - 为 HttpContext.Current.Session 编写单元测试时出现问题

Question

我有一个正在运行的应用程序，我现在需要为其添加一整套单元测试。当前代码存储用户信息如下:

HttpContext.Current.Session["UserInfo"] = userData;

我使用最小起订量进行测试，我的单元测试具有以下代码:

var server = new Mock<HttpServerUtilityBase>(MockBehavior.Loose);
var response = new Mock<HttpResponseBase>(MockBehavior.Strict);
var request = new Mock<HttpRequestBase>(MockBehavior.Strict);

var context = new Mock<HttpContextBase>();

context.SetupGet(x => x.Request).Returns(request.Object);
context.SetupGet(x => x.Response).Returns(response.Object);
context.SetupGet(x => x.Server).Returns(server.Object);

var controller = new LoginController();

controller.ControllerContext = new ControllerContext(
    context.Object, 
    new RouteData(), 
    controller);

JsonResult result = controller.LoginUser(
    new LoginHelper { 
        userName = "myusername", 
        password = "invalidpassword" 
        }
    ) as JsonResult;

当然，当我到达登录进程尝试创建 session 数据的位置时，我得到一条“对象引用未设置到对象实例”。错误，因为 HttpContext.Current 为 null。

一些研究表明，使用 Current 与 MSTest 并不完全兼容，因此我了解我可能需要更改存储/加载用户信息的方式。不过，我想要一些关于该走哪条路的建议。

如果有人建议我如何让我的单元测试工作，或者使用不同的方法来存储用户信息以使其与单元测试更兼容，我将不胜感激。

Answer 1

这是我想出的解决方案。它是我在不同地方找到的一些东西的组合，包括这里:

首先，我创建了 2 个类.. MockHttpSession 和 MockHelpers

public class MockHttpSession : HttpSessionStateBase
{
    Dictionary<string, object> m_SessionStorage = new Dictionary<string, object>();

    public override object this[string name]
    {
        get { return m_SessionStorage[name]; }
        set { m_SessionStorage[name] = value; }
    }

    public override void Abandon()
    {
        // Do nothing
    }
}

public class MockHelpers
{
    public static HttpContext FakeHttpContext()
    {
        var httpRequest = new HttpRequest("", "http://localhost/", "");
        var stringWriter = new StringWriter();
        var httpResponse = new HttpResponse(stringWriter);
        var httpContext = new HttpContext(httpRequest, httpResponse);

        var sessionContainer = new HttpSessionStateContainer(
            "id", 
            new SessionStateItemCollection(),
            new HttpStaticObjectsCollection(), 
            10, 
            true,
            HttpCookieMode.AutoDetect,
            SessionStateMode.InProc, 
            false);

        SessionStateUtility.AddHttpSessionStateToContext(httpContext, sessionContainer);

        return httpContext;
    }
}

然后我更改了单元测试代码以使用这些:

var server = new Mock<HttpServerUtilityBase>(MockBehavior.Loose);
var response = new Mock<HttpResponseBase>(MockBehavior.Strict);
var request = new Mock<HttpRequestBase>(MockBehavior.Strict);
var session = new MockHttpSession();

var context = new Mock<HttpContextBase>();
context.SetupGet(x => x.Request).Returns(request.Object);
context.SetupGet(x => x.Response).Returns(response.Object);
context.SetupGet(x => x.Server).Returns(server.Object);
context.SetupGet(x => x.Session).Returns(session);

HttpContext.Current = MockHelpers.FakeHttpContext();

var controller = new LoginController();
controller.ControllerContext = new ControllerContext(context.Object, new RouteData(), controller);

JsonResult result = controller.LoginUser(new LoginHelper { userName = "MyUserName", password = ""InvalidPassword }) as JsonResult;

这能够使用有效和无效密码成功测试代码。

感谢大家的帮助