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

Question

我有一个工作应用程序，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，如下所示：

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

我正在使用 moq 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，当我到达登录过程尝试创建会话数据的位置时，我收到"对象引用未设置为对象的实例"错误，因为 HttpContext.Current 为空。

一些研究表明，使用 Current 与 MSTest 并不完全兼容，因此我知道我可能需要更改存储/加载用户信息的方式。但是，我想就去哪条路提供一些建议。

我将

不胜感激任何关于如何让我的单元测试工作的建议，或者存储用户信息以使其与单元测试更兼容的其他方法。

Answer 1

这就是我想出的解决方案。这是我在不同地方发现的一些东西的组合，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;
    }
}

然后我更改了我的单元测试代码以使用这些代码：

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的密码成功测试代码。

感谢大家的帮助