Treasure.Trove.AddChest C# (CSharp) Method

        public void AddChest(Chest chest)
        {
            this.chests.Add(chest);
            chest.Opener = -1;
            this.availablekeys = this.availablekeys.Add(chest.Keys);
        }

        public void CannotOpenChestWithoutKeys()
        {
            Trove trove = new Trove();
            trove.AddChest(new Chest(1, new int[] { 2, 3 }));

            var result = trove.GetSolution();

            Assert.IsNull(result);
        }