We have to work in this function definition. What about associated ressources, roles ... Must be destroyed?

/**
 * Deletes a course from the course table
 *
 * @private ?
 * @param string $field
 * Possible values:
 * <ul>
 * <li>id</li>
 * <li>name</li>
 * <li>idnumber</li>
 * <li>shortname</li>
 * </ul>
 *
 * @param string $value
 *
 * @return boolean
 */
function delete_course($value, $field){
}

/**
 * Deletes some courses from the course table
 *
 * @param string $field
 * Possible values:
 * <ul>
 * <li>id</li>
 * <li>name</li>
 * <li>idnumber</li>
 * <li>shortname</li>
 * </ul>
 *
 * @param array $values
 *
 * @uses delete_course
 *
 * @return boolean
 */
function delete_courses($field, $values){
}

This funcionality is completed in CVS.
We have commit a simpletest.