drupal/modules/simpletest/tests/menu_test.module

<?php
// $Id$

/**
 * @file
 * Dummy module implementing hook menu.
 */

/**
 * Implementation of hook_menu().
 */
function menu_test_menu() {
  // The name of the menu changes during the course of the test. Using a $_GET.
  $items['menu_name_test'] = array(
    'title' => 'Test menu_name router item',
    'page callback' => 'node_save',
    'menu_name' => isset($_GET["hook_menu_name"]) ? $_GET["hook_menu_name"] : 'original',
  );
  // Use FALSE as 'title callback' to bypass t().
  $items['menu_no_title_callback'] = array(
    'title' => 'A title with @placeholder',
    'title callback' => FALSE,
    'title arguments' => array('@placeholder' => 'some other text'),
    'page callback' => 'menu_test_callback',
    'access arguments' => array('access content'),
  );
  return $items;
}

/**
 * Dummy callback for hook_menu() to point to.
 *
 * @return
 *  A random string.
 */
function menu_test_callback() {
  return $this->randomName();
}