@Test
public void testNodeChanges() {
JsopDiff diff;
NodeState before = MemoryNodeState.EMPTY_NODE;
NodeState after = new MemoryNodeState(
ImmutableMap.<String, PropertyState>of(
"a", LongPropertyState.createLongProperty("a", 1L)),
ImmutableMap.of(
"x", MemoryNodeState.EMPTY_NODE));