class ImageModuleTestHooks

class ImageModuleTestHooks {
  
  /**
   * Implements hook_image_effect_info_alter().
   */
  public function imageEffectInfoAlter(&$effects) : void {
    $state = \Drupal::state();
    // The 'image_module_test.counter' state variable value is set and accessed
    // from the ImageEffectsTest::testImageEffectsCaching() test and used to
    // signal if the image effect plugin definitions were computed or were
    // retrieved from the cache.
    // @see \Drupal\Tests\image\Kernel\ImageEffectsTest::testImageEffectsCaching()
    $counter = $state->get('image_module_test.counter');
    // Increase the test counter, signaling that image effects were processed,
    // rather than being served from the cache.
    $state->set('image_module_test.counter', ++$counter);
  }
  
  /**
   * Implements hook_ENTITY_TYPE_presave().
   *
   * Used to save test third party settings in the image style entity.
   */
  public function imageStylePresave(ImageStyleInterface $style) : void {
    $style->setThirdPartySetting('image_module_test', 'foo', 'bar');
  }
  
  /**
   * Implements hook_image_style_flush().
   */
  public function imageStyleFlush($style, $path = NULL) : void {
    $state = \Drupal::state();
    $state->set('image_module_test_image_style_flush.called', $path);
  }
  
  /**
   * Implements hook_file_download().
   */
  public function fileDownload($uri) : array {
    $default_uri = \Drupal::keyValue('image')->get('test_file_download', FALSE);
    if ($default_uri == $uri) {
      return [
        'X-Image-Owned-By' => 'image_module_test',
      ];
    }
    return [];
  }

}