def _get_text_header(self):
        raise Exception('Abstract method _get_text_header called in FormattedLayerFile. ' +
                        'This method needs to be overridden.')
Verifies the default sort key and direction.
dataset/ETHPy150Open modflowpy/flopy/flopy/utils/formattedfile.py/FormattedLayerFile._get_text_header--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/tests/unit/api/openstack/test_common.py/SortParamUtilsTest.test_get_sort_params_defaults