gm.add(entity, GROUPIE2);
assertEquals(1, gm.getEntities(GROUPIE).size());
assertEquals(1, gm.getEntities(GROUPIE2).size());
entity.deleteFromWorld();
world.process();
assertEquals(0, gm.getEntities(GROUPIE).size());
assertEquals(0, gm.getEntities(GROUPIE2).size());
assertFalse(gm.isInAnyGroup(entity));