assertNotNull(groups);
assertTrue(groups.size() == 1);
assertTrue(groups.iterator().next().getId().equals(group1.getId()));
// remove user group
testUser.removeGroup(group1);
coreUserDAO.saveEntityModel(testUser);
BaseUser testUser2 = coreUserDAO.loadEntityModel(testUser.getId());
assertTrue(testUser2.getGroups().size() == 0);
// remove user