Can I use Moq in this situation?

Question

What possible work-around do I have for mocking this object using Moq. The error message returned is: "Invalid setup on a non-virtual (overridable in VB) member: p => p.Certificate.SubjectName.Name"

        var st = new Mock<X509SecurityToken>();
        st.SetupGet(p => p.Certificate.SubjectName.Name).Returns("test1");
        var target = new X509IssuerNameRegistry("test1", "test2");

        var actual = target.GetIssuerName(st.Object);

        Assert.AreEqual<string>("test1", actual, "Actual security token did not equal expected security token");

Note: I am trying to Mock X509SecurityToken. Here is the class under test:

public class X509IssuerNameRegistry : IssuerNameRegistry { readonly List _trustedSubjectNames = new List();

public X509IssuerNameRegistry(params string[] trustedSubjectNames)
{
    _trustedSubjectNames = new List<string>(trustedSubjectNames);
}

public override string GetIssuerName(SecurityToken securityToken)
{
    var x509Token = securityToken as X509SecurityToken;
    if (x509Token != null)
    {
        if (_trustedSubjectNames.Contains(x509Token.Certificate.SubjectName.Name))
        {
            return x509Token.Certificate.SubjectName.Name;
        }
    }
    throw new SecurityTokenException("Untrusted issuer.");
}

}

Any work-rounds for this (using Moq) or should I look to another mocking framework to accomplish this?

Answer 1

No, Moq (just like any inheriting class) cannot override non-virtual methods, so unless you can make Name a virtual property (by changing or wrapping the class), it cannot be mocked by Moq.

I'd suggest that you if possible change your property to be virtual, since that will allow you to use any mocking framework. As far as I know there are only 3 that can mock non virtual methods, none of them free;

• Microsoft Fakes that comes with VS2012 (Ultimate only I believe)
• Typemock Isolator.
• Telerik JustMock (not the free version).