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<  * Flush all caches. If new test is added of test name is changed the cache_clear_all()
<  * function  does not help to update menu of tests, so drupal_flush_all_caches() is used.
<  */
< function simpletest_flush_all_caches() {
<   drupal_flush_all_caches();
<   drupal_set_message(t('All caches are cleared.'));
< }
< 
< /**