@Test public void toJson_fromJson() { Nodes.frameworkId = "id"; Node n0 = Nodes.addNode(new Node("n0")); Node n1 = Nodes.addNode(new Node("n1", Node.Type.DATANODE)); JSONObject json = Nodes.toJson(); Nodes.fromJson(json); assertEquals("id", Nodes.frameworkId); assertEquals(Arrays.asList(n0, n1), Nodes.getNodes()); }