public void SimpleMultiUseDecoration()
{
var needs = new Needs();
needs.Add <IFacility, BasicFacility>();
Assert.AreEqual(1, needs.Get <IFacility>().Facilitate());
needs.Decorate <IFacility, AdvancedFacility>();
Assert.AreEqual(2, needs.Get <IFacility>().Facilitate());
// Decorator can be re-applied/re-wrapped multiple times
needs.Decorate <IFacility, AdvancedFacility>();
Assert.AreEqual(3, needs.Get <IFacility>().Facilitate());
}