@Test public void testRemoveAllActors() throws Exception { Role base = ROLE_FACTORY.getNext(); Role second = ROLE_FACTORY.getNext(); Role third = ROLE_FACTORY.getNext(); Collection<Role> toAdd = new HashSet<>(); toAdd.add(base); toAdd.add(second); toAdd.add(third); Collection<Role> toRemove = new HashSet<>(); toRemove.add(second); toRemove.add(third); actors.addAll(toAdd); entity.addAllActors(toAdd); actors.removeAll(toRemove); entity.removeAllActors(toRemove); assertEquals(actors, entity.getActors()); }