assertTrue(rootFragmentElement instanceof Fragment);
Fragment root = (Fragment)rootFragmentElement;
assertNotNull(root.getFragments());
assertEquals(3, root.getFragments().size());
String removeId = ((BaseFragmentElement)root.getFragments().get(1)).getId();
assertNotNull(page.removeFragmentById(removeId));
SecurityConstraint pageConstraint = page.newSecurityConstraint();
pageConstraint.setUsers(Shared.makeListFromCSV("UPDATED"));
page.getSecurityConstraints().getSecurityConstraints().add(0, pageConstraint);
pageManager.updatePage(page);