ASP.NET MVC：单元测试会话变量不会更改

Question

我正在尝试对控制器的注销操作进行单位测试。我的控制器recive接口处理会话变量：

public HomeController(IUnitOfWork unitOfWork, ISecurityService security = null) 
{
    _unitOfWork = unitOfWork;   
    if (security != null)
    {
        _securityService = security;
    }
    else
    {
        _userService = new UserService(_unitOfWork)
        _securityService = new SecurityService(_userService);    
    }
}

使用量量，我创建一个httpsessionstatebase对象我用它在我的单元测试类中创建SecurityService对象：

var mockSession = new Mock<HttpSessionStateBase>();
mockSession.SetupGet(s => s["UserID"]).Returns("1");
HttpSessionStateBase session = mockSession.Object;
ISecurityService _securityService = new SecurityService(_userService, session);

我的SecurityService

public class SecurityService : ISecurityService 
{
    private readonly IUsuarioService _userService ;
    private readonly HttpSessionStateBase _session;
    public int UserID
    {
        get { return Convert.ToInt32(_session["UserID"]); }
        set { _session["UserID"] = value; }
    }
    public SecurityService(IUserService service, HttpSessionStateBase session = null)
    {
        _userService = service;
        _session = session ?? new HttpSessionStateWrapper(HttpContext.Current.Session);
    }
    public void Logout()
    {
        // I'm trying to delete this variable, but I can't
        _session["UserID"] = 0;
        _session.Clear();
        _session.Abandon();
    }
}

最后，我的测试方法

[TestMethod]
    public void Should_delete_session_variable_from_the_user()
    {
        controller.Logout();
        // It's allways 1
        Assert.IsTrue(Convert.ToInt32(session["UserID"]) == 0);
    }

---

当我调试此代码时，我可以看到会话变量不会响起其值。但是，如果我打开一个"快速观看"窗口并执行_session["UserID"] = 0;，则其值会更改。

我不明白为什么。这是我第一次看到变量不会在调试中搅动其价值。

Answer 1

最后我发现，解决方案是添加SetupSet方法。
这是最终代码：

int sessionValue = 0;
var mockSession = new Mock<HttpSessionStateBase>();
mockSession.SetupSet(s => s["UserId"] = It.IsAny<int>())
    .Callback((string name, object val) => sessionValue = (int) val);
mockSession.SetupGet(s => s["UserId"]).Returns(() => sessionValue);