public void GetValuesWhenValueNotParsedTest()
        {
            var _cache = new CollectionCache<string, object>();

            const string KEY1 = "Test1";
            var _value1 = new object();

            const string KEY2 = "Test2";
            var _value2 = new object();

            _cache.AddOrGetExisting(KEY1, _value1);
            _cache.AddOrGetExisting(KEY2, _value2);

            var _list = _cache.GetValues(new[] { KEY1 }).ToList();
            Assert.Contains(KEY1, _list.Select(_x => _x.Key).ToList());
            Assert.IsFalse(_list.Select(_x => _x.Key).Contains(KEY2));
        }