final HttpCacheEntry updatedValue = HttpTestUtils.makeCacheEntry();
final byte[] oldBytes = HttpTestUtils.getRandomBytes(128);
CASValue<Object> casValue = new CASValue<Object>(1, oldBytes);
final byte[] newBytes = HttpTestUtils.getRandomBytes(128);
CacheConfig config = new CacheConfig();
config.setMaxUpdateRetries(0);
impl = new MemcachedHttpCacheStorage(mockMemcachedClient, config,
mockMemcachedCacheEntryFactory, mockKeyHashingScheme);
HttpCacheUpdateCallback callback = new HttpCacheUpdateCallback() {
public HttpCacheEntry update(HttpCacheEntry old) {