### Question:
MapCache implements Cache<K, V> { @Override public MapCache<K, V> set(K key, V value) { if (value == null) { return this; } validateKey(key); mCache.put(key, value); return this; } <O extends MapCache.Options> MapCache(O opts); @Override V get(K key); @Override MapCache<K, V> set(K key, V value); static final float DEFAULT_LOAD_FACTOR; }### Answer:
@Test public void testNullNoOp() { gimmeCacheOfOne().set("key", null); }