propertiesToInclude.add("y");
JSONObject json = GraphSONUtility.jsonFromElement(v, propertiesToInclude, GraphSONMode.NORMAL);
Assert.assertNotNull(json);
Assert.assertTrue(json.has(GraphSONTokens._ID));
Assert.assertEquals(1, json.optInt(GraphSONTokens._ID));
Assert.assertTrue(json.has(GraphSONTokens._TYPE));
Assert.assertEquals("vertex", json.optString(GraphSONTokens._TYPE));
Assert.assertFalse(json.has("x"));
Assert.assertFalse(json.has("z"));
Assert.assertTrue(json.has("y"));