Moq property with protected setter

Question

I want to Moq next object:

abstract class Foo
{
    public string Bar { get; protected set; }
}

so that new Mock<Foo>().Bar return "Blah".

How can I do that?

---

fooMock.SetupGet<string>(s => s.Bar).Returns("Blah");

throws

Failure: System.NotSupportedException : Invalid setup on a non-virtual member: s => s.Date

and

fooMock.Protected().SetupGet<string>("Bar").Returns("Blah");

throws

To specify a setup for public property StatementSection.Date, use the typed overloads

Answer 1

Since mocking is done by creating a proxy of your class,only virtual function/property can be "moqued"

Answer 2

Like Felice (+1) said mocking creates a proxy which means you need to either make things virtual (so Moq can work its proxying magic and override the property).

As an alternative if you just want to squirt in a value you can manually stub the class you want to test and expose a means to get at the setter:-

public class FooStub : Foo {
    public SetBar(string newValue) {
       Bar = newValue;
    }
}