在ASP.net中模拟HttpSessionState以进行nunit测试

Question

我看到很多关于HttpSessionState和asp.net MVC的讨论.我正在尝试为asp.net应用程序编写测试,并想知道是否有可能模拟HttpSessionState,如果是这样,怎么样？

我目前正在使用Rhino Mocks和Nunit

Answer 1

吉尔伯特

也许我来不及你.我正在使用MSpec,但我认为概念是相似的.我需要在被测控制器中模拟HttpContext的几个组件.

我开始使用以下这些类来模拟HttpContextBase中必要的(为了我的目的)组件.我只覆盖了课程中必要的部分.您对控制器中所需的模拟的需求会有所不同.一旦理解了模式,就可以根据需要添加模拟.

public class MockHttpContext : HttpContextBase 
{

    private readonly HttpRequestBase _request = new MockHttpRequest();
    private readonly HttpServerUtilityBase _server = new MockHttpServerUtilityBase();
    private HttpSessionStateBase _session = new MockHttpSession();

    public override HttpRequestBase Request
    {
        get { return _request; }
    }
    public override HttpServerUtilityBase Server
    {
        get { return _server; }
    }
    public override HttpSessionStateBase Session
    {
        get { return _session; }
    }
}

public class MockHttpRequest : HttpRequestBase
{
    private Uri _url = new Uri("http://www.mockrequest.moc/Controller/Action");

    public override Uri Url
    {
        get { return _url; }
    }
}

public class MockHttpServerUtilityBase : HttpServerUtilityBase
{
    public override string UrlEncode(string s)
    {
        //return base.UrlEncode(s);     
        return s;       // Not doing anything (this is just a Mock)
    }
}


public class MockHttpSession : HttpSessionStateBase
{
    // Started with sample http://stackoverflow.com/questions/524457/how-do-you-mock-the-session-object-collection-using-moq
    // from http://stackoverflow.com/users/81730/ronnblack

    System.Collections.Generic.Dictionary<string, object> _sessionStorage = new   System.Collections.Generic.Dictionary<string,object>();
    public override object this[string name]
    {
        get { return _sessionStorage[name]; }
        set { _sessionStorage[name] = value; }
    }

    public override void Add(string name, object value)
    {
        _sessionStorage[name] = value;
    }
}

以下是我如何设置Controller Context以使用模拟(MSpec).这是为控制器上的实际测试设置的(测试来自这个类)

public abstract class BlahBlahControllerContext
{
    protected static BlahBlahController controller;

    Establish context = () =>
    {
        controller = new BlahBlahController();
        controller.ControllerContext = new ControllerContext()
        {
            Controller = controller,
            RequestContext = new RequestContext(new MockHttpContext(), new RouteData()),
        };
    };
}

为了进一步说明,这是一个使用模拟会话的测试(MSpec世界中的规范):

[Subject("ACCOUNT: Retrieve Password")]
public class retrieve_password_displays_retrieve_password2_page_on_success : BlahBlahControllerContext
{
    static ActionResult result;
    static RetrievePasswordModel model;

    Establish context = () =>
    {
        model = new RetrievePasswordModel()
        {
            UserName = "Mike"
        };
    };

    Because of = () =>
    {
        result = controller.RetrievePassword(model);
    };

    It should_return_a_RedirectToRouteResult = () => 
    { 
        result.is_a_redirect_to_route_and().action_name().ShouldEqual("RetrievePassword2"); 
    };

    It session_should_contain_UN_value = () =>
    {
        controller.HttpContext.Session["UN"].ShouldEqual("Mike");
    };

    It session_should_contain_PQ_value = () =>
    {
        controller.HttpContext.Session["PQ"].ShouldEqual("Question");
    };
}

我意识到这不使用Rhino Mocks.我希望它能说明这些原则,读者可以将它用于他们的具体工具和方法.

Answer 2

如果您需要为遗留代码测试确切地实例化HttpSessionState,则可以利用FormatterServices机制来获取未初始化的对象.为了使它工作,需要设置private _container字段,就像在内部构造函数中一样

例:

var state = (HttpSessionState) System.Runtime.Serialization
    .FormatterServices.GetUninitializedObject(typeof(HttpSessionState));

var containerFld = typeof(HttpSessionState).GetField(
    "_container", BindingFlags.Instance | BindingFlags.NonPublic);

var itemCollection = new SessionStateItemCollection();
itemCollection["element"] = 1;

containerFld.SetValue(
    state,
    new HttpSessionStateContainer(
        "1",
        itemCollection,
        new HttpStaticObjectsCollection(),
        900,
        true,
        HttpCookieMode.UseCookies,
        SessionStateMode.InProc,
        false
    )
);

Answer 3

查看MvcContrib 项目。