cron_queue_test.module

<?php

/**
 * Implements hook_cron_queue_info().
 */
function cron_queue_test_cron_queue_info() {
  $queues['cron_queue_test_exception'] = array(
    'worker callback' => 'cron_queue_test_exception',
  );
  $queues['cron_queue_test_callback'] = array(
    'worker callback' => array(
      'CronQueueTestCallbackClass',
      'foo',
    ),
  );
  return $queues;
}
function cron_queue_test_exception($item) {
  throw new Exception('That is not supposed to happen.');
}
class CronQueueTestCallbackClass {
  public static function foo() {

    // Do nothing.
  }

}