Invalid setup on non-virtual member, but the member is virtual

[aggieben]

I have concrete class which inherits an abstract class and overrides some if its members, and then in my test scenario, I want proxy specific ones of those for the test. Like this:

public class Base
{
    public abstract void F();
    public abstract void G();
}

public class MockBase : Base
{
    public override int F() { /* stuff */ }
    public override void G() { /* stuff */ }
}

public class TestClass
{
    [Fact]
    public void DoTest()
    {
        var mock = new Mock<MockBase>() { CallBase = true };
        mock.Setup(mb => mb.F()).Returns(7);  // <== this shouldn't fail

        // rest of test
    } 
}

Overridden methods are themselves virtual unless marked with sealed.

[aggieben]

Doh! Nevermind...The Base class I'm working with as a public and a protected F, and the public one is not virtual.