### Question:
SpyMemcachedAdapter implements MemcachedAdapter { @Override public void destroy() { memcachedClient.shutdown(); }  void setMemcachedClient(MemcachedClientIF memcachedClient); void setCacheKeyPrefix(String cacheKeyPrefix); @Override void init(OverridableReadOnlyProperties properties); @Override void destroy(); @Override Object get(CacheNamespace cacheNamespace, String key); @Override void set(CacheNamespace cacheNamespace, String key, Object value, int expirySeconds); @Override void delete(CacheNamespace cacheNamespace, String key); @Override long increaseCounter(CacheNamespace cacheNamespace, String key, long by, long defaultValue, int expirySeconds); @Override long getCounter(CacheNamespace cacheNamespace, String key, long defaultValue, int expirySeconds); @Override void evictAll(CacheNamespace cacheNamespace); static final String PROPERTY_KEY_PREFIX; static final String HOST_PROPERTY_KEY; static final String HASH_ALGORITHM_PROPERTY_KEY; static final String OPERATION_TIMEOUT_MILLIS_PROPERTY_KEY; static final String TRANSCODER_PROPERTY_KEY; static final String CACHE_KEY_PREFIX_PROPERTY_KEY; static final String AUTH_GENERATOR_PROPERTY_KEY; static final String AUTH_WAIT_TIME_MILLIS_PROPERTY_KEY; static final String NAMESPACE_NAME_SQUENCE_SEPARATOR; static final int DEFAULT_NAMESPACE_SEQUENCE_EXPIRY_SECONDS; static final long DEFAULT_AUTH_WAIT_TIME_MILLIS; }### Answer:
@Test public void destroy() throws Exception { spyMemcachedAdapter.destroy(); verify(memcachedClient).shutdown(); }