测试自定义AuthorizationAttribute时抛出NullReferenceException

我看了一下：

如何进行单元测试以测试检查请求标头的方法？

如何使用moq模拟Controller.User

如何单元测试具有[Authorize]属性的控制器方法？

我试图测试我写的一个自定义的AuthorizeAttribute。

我已经尝试了许多不同的事情来实现它。 这是我目前的尝试。

[AttributeUsage(AttributeTargets.All, AllowMultiple = false, Inherited = true)]
public class ConfigurableAuthorizeAttribute : AuthorizeAttribute
{
    private Logger log = new Logger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    private IRoleHelper roleHelper;

    public ConfigurableAuthorizeAttribute()            
    {
        roleHelper = new ADRoleHelper();
    }

    public ConfigurableAuthorizeAttribute(IRoleHelper roleHelper)            
    {
        this.roleHelper = roleHelper;
    }

    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        if (!httpContext.User.Identity.IsAuthenticated)
        {
            return false;
        }

        if (this.roleHelper.IsUserInRole(this.Roles, HttpContext.Current.User.Identity.Name))
        {
            return true;
        }

        return false;
    }

    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        base.HandleUnauthorizedRequest(filterContext);
        filterContext.Result = new RedirectResult("~/home/Unauthorized");            
    }


}

[Test]
public void unauthenticated_user_not_allowed_to_access_resource()
{
    var user = new Mock<IPrincipal>();
    user.Setup(u => u.Identity.IsAuthenticated).Returns(false);

    var authContext = new Mock<AuthorizationContext>();
    authContext.Setup(ac => ac.HttpContext.User).Returns(user.Object);

    var configAtt = new ConfigurableAuthorizeAttribute();
    configAtt.OnAuthorization(authContext.Object);

    authContext.Verify(ac => ac.Result == It.Is<RedirectResult>(r => r.Url == ""));
}

无论我做什么，在运行测试时总会得到System.NullReferenceException。 它似乎永远不会通过OnAuthorization调用。 堆栈跟踪如下所示：

结果消息：System.NullReferenceException：未将对象引用设置为对象的实例。 结果StackTrace：System.Web.Mvc.OutputCacheAttribute.GetChildActionFilterFinishCallback（ControllerContext controllerContext）at System.Web.Mvc.AuthorizeAttribute.OnAuthorization（AuthorizationContext filterContext）at ... ConfigurableAuthorizeAttributeTests.unauthenticated_user_not_allowed_to_access_resource（）in ... ConfigurableAuthorizeAttributeTests.cs：line 29

有没有人对如何解决这个问题有任何想法？

编辑

我找到了解决方案。 我还需要模拟ControllerDescriptor并确保HttpContextBase.Items返回一个新的Dictionary。

工作代码：

var context = new Mock<HttpContextBase>();
context.Setup(c => c.Items).Returns(new Dictionary<object, object>());
context.Setup(c => c.User.Identity.IsAuthenticated).Returns(false);
var controller = new Mock<ControllerBase>();

var actionDescriptor = new Mock<ActionDescriptor>();
actionDescriptor.Setup(a => a.ActionName).Returns("Index");
var controllerDescriptor = new Mock<ControllerDescriptor>();            
actionDescriptor.Setup(a => a.ControllerDescriptor).Returns(controllerDescriptor.Object);

var controllerContext = new ControllerContext(context.Object, new RouteData(), controller.Object);
var filterContext = new AuthorizationContext(controllerContext, actionDescriptor.Object);
var att = new ConfigurableAuthorizeAttribute();

att.OnAuthorization(filterContext);

Assert.That(filterContext.Result, Is.InstanceOf<RedirectResult>());
Assert.That(((RedirectResult)filterContext.Result).Url, Is.EqualTo("~/home/Unauthorized"));

---

我找到了解决方案。 我还需要模拟ControllerDescriptor并确保HttpContextBase.Items返回一个新的Dictionary。

工作代码：

var context = new Mock<HttpContextBase>();
context.Setup(c => c.Items).Returns(new Dictionary<object, object>());
context.Setup(c => c.User.Identity.IsAuthenticated).Returns(false);
var controller = new Mock<ControllerBase>();

var actionDescriptor = new Mock<ActionDescriptor>();
actionDescriptor.Setup(a => a.ActionName).Returns("Index");
var controllerDescriptor = new Mock<ControllerDescriptor>();            
actionDescriptor.Setup(a => a.ControllerDescriptor).Returns(controllerDescriptor.Object);

var controllerContext = new ControllerContext(context.Object, new RouteData(), controller.Object);
var filterContext = new AuthorizationContext(controllerContext, actionDescriptor.Object);
var att = new ConfigurableAuthorizeAttribute();

att.OnAuthorization(filterContext);

Assert.That(filterContext.Result, Is.InstanceOf<RedirectResult>());
Assert.That(((RedirectResult)filterContext.Result).Url, Is.EqualTo("~/home/Unauthorized"));

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