### Question:
JCache implements net.sf.jsr107cache.Cache { public Set keySet() { List list = cache.getKeys(); Set set = new HashSet(); set.addAll(list); return set; } JCache(Ehcache cache);  JCache(Ehcache cache, net.sf.jsr107cache.CacheLoader cacheLoader);  JCache(Ehcache cache, JCacheLoader cacheLoader); void setCacheLoader(JCacheLoader cacheLoader); void addListener(CacheListener cacheListener); void evict(); Map getAll(Collection keys); Map getAll(Collection keys, Object loaderArgument); CacheLoader getCacheLoader(); CacheEntry getCacheEntry(Object key); CacheStatistics getCacheStatistics(); void load(final Object key); void loadAll(final Collection keys); void loadAll(final Collection keys, final Object loaderArgument); Object peek(Object key); void removeListener(CacheListener cacheListener); int size(); boolean isEmpty(); boolean containsKey(Object key); boolean containsValue(Object value); Object get(Object key); Object get(Object key, Object loaderArgument); Object get(Object key, JCacheLoader loader); Object get(Object key, JCacheLoader loader, Object loaderArgument); Object put(Object key, Object value); Object put(Object key, Object value, int timeToLiveSeconds); Object remove(Object key); void putAll(Map sourceMap); void clear(); Set keySet(); Collection values(); Set entrySet(); void setStatisticsAccuracy(int statisticsAccuracy); Ehcache getBackingCache(); String toString();  }### Answer:
@Test public void testKeySet() { Ehcache ehcache = new net.sf.ehcache.Cache("testKeySet", 2, true, false, 500, 200); manager.addCache(ehcache); Cache cache = new JCache(ehcache); for (int i = 0; i < 10; i++) { cache.put(i + "", new Date()); } cache.put(0 + "", new Date()); Set set = cache.keySet(); assertEquals(10, set.size()); }
@Test public void testKeySet() { Ehcache ehcache = new net.sf.ehcache.Cache("testKeySet", 2, true, true, 500, 200); manager.addCache(ehcache); Cache cache = new JCache(ehcache); for (int i = 0; i < 10; i++) { cache.put(i + "", new Date()); } cache.put(0 + "", new Date()); Set set = cache.keySet(); assertEquals(10, set.size()); }