### Question:
KafkaCache implements Cache<K, V> { @Override public void close() throws IOException { if (kafkaTopicReader != null) { try { kafkaTopicReader.shutdown(); } catch (InterruptedException e) { } } if (producer != null) { producer.close(); log.debug("Kafka cache producer shut down for {}", clientId); } localCache.close(); if (checkpointFile != null) { checkpointFile.close(); } if (cacheUpdateHandler != null) { cacheUpdateHandler.close(); } log.info("Kafka cache shut down complete for {}", clientId); } KafkaCache(String bootstrapServers,
                      Serde<K> keySerde,
                      Serde<V> valueSerde);  KafkaCache(KafkaCacheConfig config,
                      Serde<K> keySerde,
                      Serde<V> valueSerde);  KafkaCache(KafkaCacheConfig config,
                      Serde<K> keySerde,
                      Serde<V> valueSerde,
                      CacheUpdateHandler<K, V> cacheUpdateHandler,
                      Cache<K, V> localCache);  KafkaCache(KafkaCacheConfig config,
                      Serde<K> keySerde,
                      Serde<V> valueSerde,
                      CacheUpdateHandler<K, V> cacheUpdateHandler,
                      String backingCacheName,
                      Comparator<K> comparator); @Override Comparator<? super K> comparator(); @Override boolean isPersistent(); @Override void init(); @Override void sync(); @Override int size(); @Override boolean isEmpty(); @Override boolean containsKey(Object key); @Override boolean containsValue(Object value); @Override V get(Object key); @Override V put(K key, V value); @Override void putAll(Map<? extends K, ? extends V> entries); @Override @SuppressWarnings("unchecked") V remove(Object key); @Override void clear(); @Override Set<K> keySet(); @Override Collection<V> values(); @Override Set<Map.Entry<K, V>> entrySet(); @Override K firstKey(); @Override K lastKey(); @Override Cache<K, V> subCache(K from, boolean fromInclusive, K to, boolean toInclusive); @Override KeyValueIterator<K, V> range(K from, boolean fromInclusive, K to, boolean toInclusive); @Override KeyValueIterator<K, V> all(); @Override Cache<K, V> descendingCache(); @Override void flush(); @Override void close(); @Override void destroy();  }### Answer:
@Test public void testInitialization() throws IOException { Cache<String, String> kafkaCache = createAndInitKafkaCacheInstance(bootstrapServers); kafkaCache.close(); }