### Question:
JCache implements net.sf.jsr107cache.Cache { public boolean isEmpty() { return (size() == 0); } 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 testIsEmpty() throws Exception { Ehcache ehcache = new net.sf.ehcache.Cache("testIsEmpty", 1, true, false, 500, 200); manager.addCache(ehcache); Cache cache = new JCache(ehcache); assertTrue(cache.isEmpty()); cache.put("key1", "value1"); assertFalse(cache.isEmpty()); cache.put("key2", "value1"); assertFalse(cache.isEmpty()); assertNotNull(cache.get("key1")); assertNotNull(cache.get("key2")); }
@Test public void testIsEmpty() throws Exception { Ehcache ehcache = new net.sf.ehcache.Cache("testIsEmpty", 1, true, true, 500, 200); manager.addCache(ehcache); Cache cache = new JCache(ehcache); assertTrue(cache.isEmpty()); cache.put("key1", "value1"); assertFalse(cache.isEmpty()); cache.put("key2", "value1"); assertFalse(cache.isEmpty()); assertNotNull(cache.get("key1")); assertNotNull(cache.get("key2")); }