public void UpdateUsageTest() { string key = "key"; object value = "value"; TimeSpan expiration = TimeSpan.FromSeconds(2); var cachePolicy = new CachePolicy { SlidingExpiration = expiration }; var cacheItem = new CacheItem(key, value, cachePolicy); bool hasExpiration = cacheItem.CanExpire(); Assert.AreEqual(true, hasExpiration); bool isExpired = cacheItem.IsExpired(); Assert.AreEqual(false, isExpired); Thread.Sleep(TimeSpan.FromSeconds(1)); cacheItem.UpdateUsage(); isExpired = cacheItem.IsExpired(); Assert.AreEqual(false, isExpired); Thread.Sleep(expiration); isExpired = cacheItem.IsExpired(); Assert.AreEqual(true, isExpired); cacheItem.UpdateUsage(); isExpired = cacheItem.IsExpired(); Assert.AreEqual(false, isExpired); }