public void visit_to_get_customizatinos()
{
var settings1 = new AppSettings();
var settings2 = new FakeSettings();
theSettings.Replace(settings1);
theSettings.Replace(settings2);
var visitor = MockRepository.GenerateMock <Action <Type, object> >();
theSettings.ForAllSettings(visitor);
visitor.AssertWasCalled(x => x.Invoke(typeof(AppSettings), settings1));
visitor.AssertWasCalled(x => x.Invoke(typeof(FakeSettings), settings2));
}