如何使用 HttpApplicationState 测试 HttpApplication 对象

Question

我正在尝试测试在 Application_Start 上加载的 ASPNET HttpApplication 的“插件”。

代码是这样的：

private HttpApplication application;

public void Application_Start(object sender, EventArgs e)
{
    this.application = sender as HttpApplication;

    StartReportService();
}

private void StartReportService()
{

    HandledReports = new SortedList<string, string>();
    HandledReports.Add("myindex","myvalue");

}

public System.Collections.Generic.SortedList<String, String> HandledReports
{
    get 
    {
        application.Application.Lock();
        var handledReports = (SortedList<String, String>)application.Application["handledReports"];
        application.Application.UnLock();
        return handledReports;
    }
    set 
    { 
        application.Application.Lock();
        application.Application["handledReports"] = value; 
        application.Application.UnLock();
    }
}

问题是我找不到测试 HttpApplicationState 的好方法，主要是因为 HttpApplication.Application 属性不可重写，并且似乎没有成为 System.Web.Abstractions 中允许这样做的 HttpApplicationBase 类。

我尝试过以下各种变体，但每次总是遇到障碍。

[TestMethod()]
public void StartReportService_ApplicationStateShouldContainMyIndex()
{
    //No HttpApplicationBase in System.Web.Abstractions, must use Real Object
    var application = new Mock<HttpApplication>();

    //Real object does not have a property of type HttpApplicationStateBase so must use real one?
    //var applicationStateBase = new Mock<HttpApplicationStateBase>();

    //real one not creable so HACK get private constructor
    var ctor = typeof(HttpApplicationState).GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new Type[] { }, new ParameterModifier[] { });
    var applicationState = (HttpApplicationState)ctor.Invoke(new Object[] { });

    //fails here, HttpApplication.Application not overridable
    application.SetupProperty(x => x.Application, applicationState);


    var plugin = HttpApplicationPlugin.HttpApplicationPluginInstance;
    plugin.Application_Start(application.Object,null);

    ...evaluate result...
}

有人能为我提供一些好的方法吗？ 这是更多依赖于能够模拟正常运行的 HttpApplicationState 的第一个测试。

Answer 1

经过一些仔细的思考和一些反思:)，我想出了这个解决方案来解决我自己的问题：

 [TestMethod()]
 public void StartReportService_ApplicationStateShouldContainMyIndex()
 {
    HttpApplicationPlugin plugin=null;
    HttpApplication app = null;
    HttpApplicationState applicationState = null;
    String tempDir = "";
    try
    {
        #region "Create HttpApplication and ApplicationState"

        //No HttpApplicationBase in System.Web.Abstractions, must use Real Object
        app = new HttpApplication();

        //real one not creatable so HACK get private constructor
        var ctor = typeof(HttpApplicationState).GetConstructor(
                      BindingFlags.Instance | BindingFlags.NonPublic, 
                      null, new Type[] { }, new ParameterModifier[] { });
        applicationState = (HttpApplicationState)ctor.Invoke(new Object[] { });

        //HACK in the state prop for testing
        var stateProp = typeof(HttpApplication).GetField(
                           "_state", BindingFlags.Instance | BindingFlags.NonPublic);
        stateProp.SetValue(app, applicationState);

        #endregion


       plugin = HttpApplicationPlugin.HttpApplicationPluginInstance;
       plugin.Application_Start(application.Object,null);          

本质上，你可以使用反射给你一个带有 HttpApplication 对象>HttpApplicationState 对象足以测试依赖于此的代码块。