Question

earlier today I asked this question.

So since moq creates it’s own class from an interface I wasn’t able to cast it to a different class.

So it got me wondering what if I created a ICustomPrincipal and tried to cast to that.

This is how my mocks look:

var MockHttpContext = new Mock<HttpContextBase>();
var MockPrincipal = new Mock<ICustomPrincipal>();

MockHttpContext.SetupGet(h => h.User).Returns(MockPrincipal.Object);

In the method I am trying to test the follow code gives the error(again):

var user = (ICustomPrincipal)httpContext.User;

The error is the following:

Unable to cast object of type 'IPrincipalProxy4081807111564298854aabfc890edcc8' 
to type 'MyProject.Web.ICustomPrincipal'.

I guess I still need some practice with interfaces and moq but shouldn’t I be able to cast the class that moq created back to ICustomPrincipal? I know httpContext.User returns an IPrincipal so maybe something gets lost there?

Well if anybody can help me I would appreciate that.

Pickels

Edit:
As requested the full code of the method I am testing. It’s still not finished but this is what I have so far:

public bool AuthorizeCore(HttpContextBase httpContext)
{
    if (httpContext == null)
    {
        throw new ArgumentNullException("httpContext");
    }

    var user = (ICustomPrincipal)httpContext.User;

    if (!user.Identity.IsAuthenticated)
    {
        return false;
    }

    return true;
}

Edit2:

Seems that if I use Thread.CurrentPrincipal instead of HttpContext.current.user I can cast it without a problem. Reading up on the differences between the two now.

Answer 1

I think you need to be able to inject your mocks into your code…

For instance, in your class if you add the following:

public static HttpContextBase HttpContext;
public static ICustomPrincipal User;

and have the following in your code…

var user = (ICustomPrincipal)User;

and in your class under test (say it is named ClassUnderTest)

ClassUnderTest.HttpContextBase = MockHttpContext.Object;

and

ClassUnderTest.User = MockPrincipal.Object;

well… I think that that should fix things for you.