}
protected List<MagicKey> init() {
List<MagicKey> keys = new ArrayList<MagicKey>(Arrays.asList(
new MagicKey("k1", c1), new MagicKey("k2", c2),
new MagicKey("k3", c3), new MagicKey("k4", c4)
));
assertEquals(caches.size(), keys.size(), "Received caches" + caches);
int i = 0;
for (Cache<Object, String> c : caches) c.put(keys.get(i++), "v" + i);