public void ChainOfResponsibilityTest()
{
// The other part of the client code constructs the actual chain.
var monkey = new MonkeyHandler();
var squirrel = new SquirrelHandler();
var dog = new DogHandler();
monkey.SetNext(squirrel).SetNext(dog);
// The client should be able to send a request to any handler, not just the first one in the chain.
var monkeyResult = Client.ClientCode(monkey);
var enumerable = monkeyResult as string?[] ?? monkeyResult.ToArray();
enumerable.Count().Should().Be(3);
enumerable[0].Should().Be(BehavioralText.Squirrel(BehavioralText.Nut));
enumerable[1].Should().Be(BehavioralText.Monkey(BehavioralText.Banana));
enumerable[2].Should().Be(BehavioralText.Untouched(BehavioralText.Cheese));
var squirrelResult = Client.ClientCode(squirrel);
enumerable = squirrelResult as string?[] ?? squirrelResult.ToArray();
enumerable.Count().Should().Be(3);
enumerable[0].Should().Be(BehavioralText.Squirrel(BehavioralText.Nut));
enumerable[1].Should().Be(BehavioralText.Untouched(BehavioralText.Banana));
enumerable[2].Should().Be(BehavioralText.Untouched(BehavioralText.Cheese));
}
public static IEnumerable <string?> ClientCode(AbstractHandler handler)
{
return((from food in new List <string> {
BehavioralText.Nut, BehavioralText.Banana, BehavioralText.Cheese
}
let result = handler.Handle(food)
select result != null
? result.ToString()
: BehavioralText.Untouched(food)).ToList());
}