どっかで見たことがあるような、無いような

FightingGame.groovy

package tddbc


class Fighter {

    Action attack(Command command) {
        new Action(list: command.apply())
    }

}

enum Skill {

    斬る,
    払う,
    けさ斬り,
    ためる,

    マルチウェイ

}

class Command {

    List<Skill> input

    List<Skill> apply() {
        if (input == [Skill.斬る, Skill.払う, Skill.けさ斬り, Skill.斬る]) return [Skill.マルチウェイ]
        input
    }

}

class Action {

    List<Skill> list

    Damage getDamage() {
        if (list.contains(Skill.マルチウェイ)) {
            return new Damage(value: 65535)
        }
        new Damage(value: list.size() * 2)
    }

}

class Damage {
    Integer value
}

def fighter = new Fighter()

assert fighter.attack(new Command(input: [])).damage.value == 0
assert fighter.attack(new Command(input: [Skill.斬る])).list == [Skill.斬る]

def multiWayCommand = new Command(input: [Skill.斬る, Skill.払う, Skill.けさ斬り, Skill.斬る])

assert fighter.attack(multiWayCommand).list == [Skill.マルチウェイ]
assert fighter.attack(multiWayCommand).damage.value == 65535