assertEquals(MobileEvent.FALLEN, publisher4.getUpdateObjects().get(0));
assertEquals(1, publisher5.nbUpdated());
assertEquals(MobileEvent.FALLEN, publisher5.getUpdateObjects().get(0));
assertEquals(1, publisher6.nbUpdated());
assertEquals(MobileEvent.FALLEN, publisher6.getUpdateObjects().get(0));
assertEquals(1, publisher7.nbUpdated());
assertEquals(MobileEvent.FALLEN, publisher7.getUpdateObjects().get(0));
// only mobile1 and mobile2 should still be in the list of mobile
assertTrue(gravity.getMobiles().contains(mobile1));
assertTrue(gravity.getMobiles().contains(mobile2));