materio-base-d7/modules/simpletest/tests/update_script_test.module

<?php

/**
 * @file
 * This file provides testing functionality for update.php.
 */

/**
 * Implements hook_flush_caches().
 *
 * This sets a message to confirm that all caches are cleared whenever
 * update.php completes.
 *
 * @see UpdateScriptFunctionalTest::testRequirements()
 */
function update_script_test_flush_caches() {
  drupal_set_message(t('hook_flush_caches() invoked for update_script_test.module.'));
}