User userA = createUser();
_service.setLastSelectedStopIds(userA, Arrays.asList("A"));
_service.setDefaultLocation(userA, "here", 47.0, -122.0);
_service.addStopBookmark(userA, "bookmark a", Arrays.asList("A", "C"),
new RouteFilter());
User userB = createUser();
_service.setLastSelectedStopIds(userB, Arrays.asList("B"));
_service.setDefaultLocation(userB, "there", 48.0, -123.0);
_service.addStopBookmark(userB, "bookmark b", Arrays.asList("B", "A"),
new RouteFilter());
_service.mergeProperties(userA, userB);
UserPropertiesV1 props = getProperties(userB);
List<String> bookmarks = props.getBookmarkedStopIds();