String mmName = "mm";
TestHazelcastInstanceFactory factory = createHazelcastInstanceFactory(2);
final Config config = new Config();
final MultiMapConfig multiMapConfig = config.getMultiMapConfig(mmName);
multiMapConfig.setValueCollectionType(MultiMapConfig.ValueCollectionType.LIST);
final HazelcastInstance instance1 = factory.newHazelcastInstance(config);
final HazelcastInstance instance2 = factory.newHazelcastInstance(config);
final String key = generateKeyOwnedBy(instance1);
final MultiMap<Object, Object> mm1 = instance1.getMultiMap("mm");
mm1.put(key, 1);