StructureModifier<List<WrappedWatchableObject>> watchableAccessor =
entityMetadata.getWatchableCollectionModifier();
assertNull(watchableAccessor.read(0));
WrappedDataWatcher watcher = new WrappedDataWatcher();
watcher.setObject(1, 10);
watcher.setObject(8, 10);
List<WrappedWatchableObject> list = watcher.getWatchableObjects();
// Insert and read back
watchableAccessor.write(0, list);
assertEquals(list, watchableAccessor.read(0));
}