CayenneContext context = new CayenneContext(channel);
ClientMtTable1 o = context.newObject(ClientMtTable1.class);
ObjectId tempId = o.getObjectId();
o.setServerAttribute1("YY");
context.commitChanges();
assertEquals(2, diffReader.size);
assertEquals(1, diffs.size());
assertEquals(tempId, diffs.get(0).sourceId);
assertEquals(ClientMtTable1.GLOBAL_ATTRIBUTE1_PROPERTY, diffs.get(0).property);