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 [];
    }

}