tcase_add_test (tc, controller_interpolation_unset);
tcase_add_test (tc, controller_interpolation_unset_all);
tcase_add_test (tc, controller_interpolation_linear_value_array);
tcase_add_test (tc, controller_interpolation_linear_invalid_values);
tcase_add_test (tc, controller_interpolation_linear_default_values);
tcase_add_test (tc, controller_interpolation_unset);
tcase_add_test (tc, controller_interpolation_unset_all);
tcase_add_test (tc, controller_interpolation_linear_value_array);
tcase_add_test (tc, controller_interpolation_linear_invalid_values);
tcase_add_test (tc, controller_interpolation_linear_default_values);