public void test() {
TSMasterTwo m0 = new TSMasterTwo();
m0.setName("m1");
m0.addDetail(new TSDetailTwo("m1 detail 1"));
m0.addDetail(new TSDetailTwo("m1 detail 2"));
Ebean.save(m0);
TSMasterTwo master = Ebean.find(TSMasterTwo.class, m0.getId());
List<TSDetailTwo> details = master.getDetails();
TSDetailTwo removedDetail = details.remove(1);
BeanCollection<?> bc = (BeanCollection<?>) details;
Set<?> modifyRemovals = bc.getModifyRemovals();
Assert.assertNotNull(modifyRemovals);