### Question:
SecurityServiceImpl extends RemoteServiceServlet implements SecurityService { @Override public void deleteGroup(long groupId) throws ServerException { Session session = ServiceUtil.checkMenu(getThreadLocalRequest(), Menu.SECURITY); try { UserDAO userDao = (UserDAO) Context.get().getBean(UserDAO.class); GroupDAO groupDao = (GroupDAO) Context.get().getBean(GroupDAO.class); Group grp = groupDao.findById(groupId); groupDao.initialize(grp); for (User user : grp.getUsers()) { user.removeGroup(groupId); userDao.store(user); } groupDao.delete(groupId); } catch (Throwable t) { ServiceUtil.throwServerException(session, log, t); } }  static GUITenant getTenant(long tenantId); static GUITenant fromTenant(Tenant tenant); static GUITenant getTenant(String tenantName); GUISession loadSession(Session sess, String locale); @Override GUISession getSession(String locale); @Override void logout(); @Override int changePassword(Long requestorUserId, long userId, String oldPassword, String newPassword,
			boolean notify); @Override void addUserToGroup(long groupId, long userId); @Override void deleteGroup(long groupId); @Override void deleteUser(long userId); @Override GUIGroup getGroup(long groupId); @Override GUIUser getUser(long userId); @Override void removeFromGroup(long groupId, long[] userIds); @Override GUIGroup saveGroup(GUIGroup group); @Override GUIUser saveUser(GUIUser user, GUIInfo info); @Override GUIUser saveProfile(GUIUser user); @Override GUIUser saveInterfaceSettings(GUIUser user); @Override void kill(String sid); @Override GUISecuritySettings loadSettings(); @Override boolean saveSettings(GUISecuritySettings settings); @Override void applyRights(GUIMenu menu); @Override GUIMenu getMenu(long menuId); @Override GUIUser[] searchUsers(String username, String groupId); @Override GUISequence[] loadBlockedEntities(); @Override void removeBlockedEntities(long[] ids); @Override void replicateUsersSettings(long masterUserId, Long[] userIds, boolean gui, boolean groups);  }### Answer:
@Test public void testDeleteGroup() throws ServerException { Assert.assertNotNull(groupDAO.findById(10)); service.deleteGroup(10); Assert.assertNull(groupDAO.findById(10)); Assert.assertNotNull(groupDAO.findById(1)); service.deleteGroup(1); Assert.assertNotNull(groupDAO.findById(1)); }