drupal/modules/simpletest/tests/system_test.module

<?php
// $Id$

/**
 * Implement hook_menu().
 */
function system_test_menu() {
  $items['system-test/sleep/%'] = array(
    'page callback' => 'system_test_sleep',
    'page arguments' => array(2),
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  $items['system-test/auth'] = array(
    'page callback' => 'system_test_basic_auth_page',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  $items['system-test/redirect/%'] = array(
    'title' => 'Redirect',
    'page callback' => 'system_test_redirect',
    'page arguments' => array(2),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['system-test/set-header'] = array(
    'page callback' => 'system_test_set_header',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['system-test/redirect-noscheme'] = array(
    'page callback' => 'system_test_redirect_noscheme',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['system-test/redirect-noparse'] = array(
    'page callback' => 'system_test_redirect_noparse',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['system-test/redirect-invalid-scheme'] = array(
    'page callback' => 'system_test_redirect_invalid_scheme',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  $items['system-test/destination'] = array(
    'title' => 'Redirect',
    'page callback' => 'system_test_destination',
    'page arguments' => array(2),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );

  $items['system-test/variable-get'] = array(
    'title' => 'Variable Get',
    'page callback' => 'variable_get',
    'page arguments' => array('simpletest_bootstrap_variable_test', NULL),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );

  $items['system-test/lock-acquire'] = array(
    'title' => 'Lock acquire',
    'page callback' => 'system_test_lock_acquire',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  $items['system-test/lock-exit'] = array(
    'title' => 'Lock acquire then exit',
    'page callback' => 'system_test_lock_exit',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  return $items;
}

function system_test_sleep($seconds) {
  sleep($seconds);
}

function system_test_basic_auth_page() {
  $output = t('$_SERVER[\'PHP_AUTH_USER\'] is @username.', array('@username' => $_SERVER['PHP_AUTH_USER']));
  $output .= t('$_SERVER[\'PHP_AUTH_PW\'] is @password.', array('@password' => $_SERVER['PHP_AUTH_PW']));
  return $output;
}

function system_test_redirect($code) {
  $code = (int)$code;
  if ($code != 200) {
    header("Location: " . url('system-test/redirect/200', array('absolute' => TRUE)), TRUE, $code);
    exit;
  }
  return '';
}

function system_test_set_header() {
  drupal_set_header($_GET['name'], $_GET['value']);
  return t('The following header was set: %name: %value', array('%name' => $_GET['name'], '%value' => $_GET['value']));
}

function system_test_redirect_noscheme() {
  header("Location: localhost/path", TRUE, 301);
  exit;
}

function system_test_redirect_noparse() {
  header("Location: http:///path", TRUE, 301);
  exit;
}

function system_test_redirect_invalid_scheme() {
  header("Location: ftp://localhost/path", TRUE, 301);
  exit;
}

function system_test_destination() {
  return 'The destination: ' . drupal_get_destination();
}

/**
 * Implement hook_modules_installed().
 */
function system_test_modules_installed($modules) {
  if (in_array('aggregator', $modules)) {
    drupal_set_message(t('hook_modules_installed fired for aggregator'));
  }
}

/**
 * Implement hook_modules_enabled().
 */
function system_test_modules_enabled($modules) {
  if (in_array('aggregator', $modules)) {
    drupal_set_message(t('hook_modules_enabled fired for aggregator'));
  }
}

/**
 * Implement hook_modules_disabled().
 */
function system_test_modules_disabled($modules) {
  if (in_array('aggregator', $modules)) {
    drupal_set_message(t('hook_modules_disabled fired for aggregator'));
  }
}

/**
 * Implement hook_modules_uninstalled().
 */
function system_test_modules_uninstalled($modules) {
  if (in_array('aggregator', $modules)) {
    drupal_set_message(t('hook_modules_uninstalled fired for aggregator'));
  }
}

/**
 * Implement hook_boot().
 */
function system_test_boot() {
  watchdog('system_test', 'hook_boot');
}

/**
 * Implement hook_init().
 */
function system_test_init() {
  // Used by FrontPageTestCase to get the results of drupal_is_front_page().
  if (variable_get('front_page_output', 0) && drupal_is_front_page()) {
    drupal_set_message(t('On front page.'));
  }
}

/**
 * Implement hook_exit().
 */
function system_test_exit() {
  watchdog('system_test', 'hook_exit');
}

/**
 * Implement hook_system_info_alter().
 */
function system_test_system_info_alter(&$info, $file) {
  // We need a static otherwise the last test will fail to alter common_test.
  static $test;
  if (($dependencies = variable_get('dependencies', array())) || $test) {
    if ($file->name == 'module_test') {
      $info['hidden'] = FALSE;
      $info['dependencies'][] = array_shift($dependencies);
      variable_set('dependencies', $dependencies);
      $test = TRUE;
    }
    if ($file->name == 'common_test') {
      $info['hidden'] = FALSE;
      $info['version'] = '7.x-2.4-beta3';
    }
  }
}

/**
 * Try to acquire a named lock and report the outcome.
 */
function system_test_lock_acquire() {
  if (lock_acquire('system_test_lock_acquire')) {
    lock_release('system_test_lock_acquire');
    return 'TRUE: Lock successfully acquired in system_test_lock_acquire()';
  }
  else {
    return 'FALSE: Lock not acquired in system_test_lock_acquire()';
  }
}

/**
 * Try to acquire a specific lock, and then exit.
 */
function system_test_lock_exit() {
  if (lock_acquire('system_test_lock_exit', 900)) {
    echo 'TRUE: Lock successfully acquired in system_test_lock_exit()';
    // The shut-down function should release the lock.
    exit();
  }
  else {
    return 'FALSE: Lock not acquired in system_test_lock_exit()';
  }
}