em.getTransaction().begin();
game.getRainDates().add(1, rainDates.get(1));
game.getRainDates().add(6, rainDates.get(6));
em.getTransaction().commit();
em.clear();
newGame = em.find(Game.class, game.getId());
assertNotNull(newGame);
assertNotNull(game.getRainDates());
assertEquals(12, game.getRainDates().size());