### Question:
SecurityServiceImpl extends RemoteServiceServlet implements SecurityService { @Override public GUIGroup getGroup(long groupId) throws ServerException { ServiceUtil.validateSession(getThreadLocalRequest()); GroupDAO groupDao = (GroupDAO) Context.get().getBean(GroupDAO.class); Group group = groupDao.findById(groupId); if (group != null) { GUIGroup grp = new GUIGroup(); grp.setId(groupId); grp.setDescription(group.getDescription()); grp.setName(group.getName()); grp.setSource(group.getSource()); return grp; } return null; }  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 testGetGroup() throws ServerException { GUIGroup group = service.getGroup(10); Assert.assertNotNull(group); Assert.assertEquals("testGroup", group.getName()); group = service.getGroup(999); Assert.assertNull(group); }