LiveInstance instance = helixDataAccessor.getProperty(propertyKey);
Map<String, String> map = new TreeMap<String, String>();
map.put("k1", "v1");
instance.getRecord().setMapField("test", map);
Assert.assertTrue(helixDataAccessor.updateProperty(propertyKey, instance),
"Failed to update live instance node");
instances = changeList.poll(1, TimeUnit.SECONDS);
Assert.assertNotNull(instances, "Expecting a list of live instance");
Assert.assertEquals(instances.get(0).getRecord().getMapField("test"), map, "Wrong map data.");