final TestHazelcastInstanceFactory factory = createHazelcastInstanceFactory(2);
final HazelcastInstance h1 = factory.newHazelcastInstance(config);
final IMap map = h1.getMap("default");
map.put("1", "1");
boolean b = h1.executeTransaction(options, new TransactionalTask<Boolean>() {
public Boolean execute(TransactionalTaskContext context) throws TransactionException {
final TransactionalMap<Object, Object> txMap = context.getMap("default");
txMap.delete("1");
assertEquals(false, txMap.containsKey("1"));
assertEquals(true, map.containsKey("1"));