drupal-civicrm/modules/simpletest/tests/image_test.module

<?php

/**
 * @file
 * Helper module for the image tests.
 */

/**
 * Implements hook_image_toolkits().
 */
function image_test_image_toolkits() {
  return array(
    'test' => array(
      'title' => t('A dummy toolkit that works'),
      'available' => TRUE,
    ),
    'broken' => array(
      'title' => t('A dummy toolkit that is "broken"'),
      'available' => FALSE,
    ),
  );
}

/**
 * Reset/initialize the history of calls to the toolkit functions.
 *
 * @see image_test_get_all_calls()
 */
function image_test_reset() {
  // Keep track of calls to these operations
  $results = array(
    'load' => array(),
    'save' => array(),
    'settings' => array(),
    'resize' => array(),
    'rotate' => array(),
    'crop' => array(),
    'desaturate' => array(),
  );
  variable_set('image_test_results', $results);
}

/**
 * Get an array with the all the calls to the toolkits since image_test_reset()
 * was called.
 *
 * @return
 *   An array keyed by operation name ('load', 'save', 'settings', 'resize',
 *   'rotate', 'crop', 'desaturate') with values being arrays of parameters
 *   passed to each call.
 */
function image_test_get_all_calls() {
  return variable_get('image_test_results', array());
}

/**
 * Store the values passed to a toolkit call.
 *
 * @param $op
 *   One of the image toolkit operations: 'get_info', 'load', 'save',
 *   'settings', 'resize', 'rotate', 'crop', 'desaturate'.
 * @param $args
 *   Values passed to hook.
 *
 * @see image_test_get_all_calls()
 * @see image_test_reset()
 */
function _image_test_log_call($op, $args) {
  $results = variable_get('image_test_results', array());
  $results[$op][] = $args;
  variable_set('image_test_results', $results);
}

/**
 * Image tookit's settings operation.
 */
function image_test_settings() {
  _image_test_log_call('settings', array());
  return array();
}

/**
 * Image toolkit's get_info operation.
 */
function image_test_get_info(stdClass $image) {
  _image_test_log_call('get_info', array($image));
  return array();
}

/**
 * Image tookit's load operation.
 */
function image_test_load(stdClass $image) {
  _image_test_log_call('load', array($image));
  return $image;
}

/**
 * Image tookit's save operation.
 */
function image_test_save(stdClass $image, $destination) {
  _image_test_log_call('save', array($image, $destination));
  // Return false so that image_save() doesn't try to chmod the destination
  // file that we didn't bother to create.
  return FALSE;
}

/**
 * Image tookit's crop operation.
 */
function image_test_crop(stdClass $image, $x, $y, $width, $height) {
  _image_test_log_call('crop', array($image, $x, $y, $width, $height));
  return TRUE;
}

/**
 * Image tookit's resize operation.
 */
function image_test_resize(stdClass $image, $width, $height) {
  _image_test_log_call('resize', array($image, $width, $height));
  return TRUE;
}

/**
 * Image tookit's rotate operation.
 */
function image_test_rotate(stdClass $image, $degrees, $background = NULL) {
  _image_test_log_call('rotate', array($image, $degrees, $background));
  return TRUE;
}

/**
 * Image tookit's desaturate operation.
 */
function image_test_desaturate(stdClass $image) {
  _image_test_log_call('desaturate', array($image));
  return TRUE;
}