public void ContainsValue()
        {
            var ld = new RecentDictionary <string, int>();

            for (int i = 0; i < 100; i++)
            {
                ld.Add(i.ToString(), i);
            }

            ld.Remove("42");

            Assert.True(ld.ContainsValue(66));
            Assert.True(ld.Values.Contains(88));
            Assert.False(ld.ContainsValue(42));
            Assert.False(ld.ContainsValue(543434));
        }