public void ConstructAddAndRetrieveWithDefaultCtorReturnsValue()
        {
            var x = new ConcurrentTLru <int, int>(3, TimeSpan.FromSeconds(1));

            x.GetOrAdd(1, k => k).Should().Be(1);
        }
 public ConcurrentTLruTests()
 {
     lru = new ConcurrentTLru <int, string>(1, capacity, EqualityComparer <int> .Default, timeToLive);
 }