server.addNotificationListener(objectName2, listener, null, null);
assertEquals(emitter1.getNotificationListeners().size(), 1);
assertEquals(emitter2.getNotificationListeners().size(), 1);
server.removeNotificationListener(objectName1, listener, null, null);
assertEquals(emitter1.getNotificationListeners().size(), 0);
assertEquals(emitter2.getNotificationListeners().size(), 1);
server.removeNotificationListener(objectName2, listener, null, null);
assertEquals(emitter1.getNotificationListeners().size(), 0);