/** Verify the cache can put and delete a KV pair successfully. */
@Test
public void singlePutAndDel() {
KVCache cache = new KVCache(1, 4);
cache.put("hello", "world");
assertEquals("world", cache.get("hello"));
cache.del("hello");
assertEquals(null, cache.get("hello"));
System.out.println("Test2 Success");
}
