public static void main(String[] args) {
        Horse horse1 = new Horse("horse1", 3,0);
        Horse horse2 = new Horse("horse2", 3,0);
        Horse horse3 = new Horse("horse3", 3,0);
        horses = new ArrayList<>();
        horses.add(horse1);
        horses.add(horse2);
        horses.add(horse3);

        game = new Hippodrome(horses);


    }
а в чем сосбственно проблема валидации?