Handle property with a protected setter

[gabrielrobert]

We had an issue mocking a DbContext with models containing a property with a protected setter. For example:

public class Entity
{
    public DateTime CreationDate { get; protected set; }

    protected Entity()
    {
        CreationDate = DateTime.UtcNow;
    }
}

[huysentruitw]

Now, this is how PR's should look like! Well done & thanks. 🎉