Set<UserRole> roles = testGroup.getRoles();
assertNotNull(roles);
assertTrue(roles.size() == 1);
assertTrue(roles.iterator().next().getRole().equals(role1.getRole()));
testGroup.removeRole(role1);
userGroupDAO.saveEntityModel(testGroup);
assertEquals(testGroup.getId(), group.getId());
UserGroup testGroup2 = userGroupDAO.loadEntityModel(testGroup.getId());
assertTrue(testGroup2.getRoles().size() == 0);