final DummyTransactionManager tm = dummyTm(ORIGINATOR_INDEX);
Future<DummyTransaction> f = fork(new Callable<DummyTransaction>() {
@Override
public DummyTransaction call() throws Exception {
tm.begin();
originatorCache.put(key, "value");
final DummyTransaction tx = tm.getTransaction();
final boolean success = tx.runPrepare();
assert success;