def test_delete_user_group_err(self):

        self.log_user()

        username = 'usergrouperr'

        groupname = 'usergroup_fail'

        fixture.create_user(name=username)

        ug = fixture.create_user_group(name=groupname, cur_user=username)

        new_user = Session().query(User)\

            .filter(User.username == username).one()

        response = self.app.delete(url('user', id=new_user.user_id))

        self.checkSessionFlash(response, 'User "%s" still '

                               'owns 1 user groups and cannot be removed. '

                               'Switch owners or remove those user groups: '

                               '%s' % (username, groupname))

        # TODO: why do this fail?

        #response = self.app.delete(url('delete_users_group', id=groupname))

        #self.checkSessionFlash(response, 'Removed user group %s' % groupname)

        fixture.destroy_user_group(ug.users_group_id)

        response = self.app.delete(url('user', id=new_user.user_id))

        self.checkSessionFlash(response, 'Successfully deleted user')