public void ischildnodeTest() throws Exception {
Tree tree = root.getTree("/");
Tree parents = tree.addChild("parents");
parents.addChild("p0").setProperty("id", "0");
parents.addChild("p1").setProperty("id", "1");
parents.addChild("p2").setProperty("id", "2");
Tree children = tree.addChild("children");
children.addChild("c1").setProperty("p", "1");
children.addChild("c2").setProperty("p", "2");
children.addChild("c3").setProperty("p", "3");
children.addChild("c4").setProperty("p", "4");