def test_list_services(self):
        with patch.object(firewalld, '__firewall_cmd', return_value=''):
            self.assertEqual(firewalld.list_services(), [])
Remove all widgets from the input canvas
dataset/ETHPy150Open saltstack/salt/tests/unit/modules/firewalld_test.py/FirewalldTestCase.test_list_services--crossover with--dataset/ETHPy150Open glue-viz/glue/glue/dialogs/link_editor/qt/link_equation.py/LinkEquation._clear_input_canvas