@Override
  public Object getSubstituteValue(EntryEvent event) {
    return new GatewayEventSubstituteObject(this, SUBSTITUTION_PREFIX + event.getKey());
  }
Returns true if the test should create off-heap regions. OffHeap tests should over-ride this
method and return false.
geode-dunit/src/main/java/org/apache/geode/internal/cache/wan/AsyncEventQueueTestBase.java