public void Contains()
        {
            CopyOnWriteArrayList <int> full = populatedArray(3);

            Assert.IsTrue(full.Contains(one));
            Assert.IsFalse(full.Contains(five));
        }
        public void AddIfAbsent2()
        {
            CopyOnWriteArrayList <int> full = populatedArray(DEFAULT_COLLECTION_SIZE);

            full.AddIfAbsent(three);
            Assert.IsTrue(full.Contains(three));
        }