Chris@17: <?php
Chris@17: 
Chris@17: namespace Drupal\Core\Test;
Chris@17: 
Chris@17: use Drupal\Core\Cache\Cache;
Chris@17: 
Chris@17: /**
Chris@17:  * Provides a method to refresh in-memory configuration and state information.
Chris@17:  */
Chris@17: trait RefreshVariablesTrait {
Chris@17: 
Chris@17:   /**
Chris@17:    * Refreshes in-memory configuration and state information.
Chris@17:    *
Chris@17:    * Useful after a page request is made that changes configuration or state in
Chris@17:    * a different thread.
Chris@17:    *
Chris@17:    * In other words calling a settings page with $this->drupalPostForm() with a
Chris@17:    * changed value would update configuration to reflect that change, but in the
Chris@17:    * thread that made the call (thread running the test) the changed values
Chris@17:    * would not be picked up.
Chris@17:    *
Chris@17:    * This method clears the cache and loads a fresh copy.
Chris@17:    */
Chris@17:   protected function refreshVariables() {
Chris@17:     // Clear the tag cache.
Chris@17:     \Drupal::service('cache_tags.invalidator')->resetChecksums();
Chris@17:     foreach (Cache::getBins() as $backend) {
Chris@17:       if (is_callable([$backend, 'reset'])) {
Chris@17:         $backend->reset();
Chris@17:       }
Chris@17:     }
Chris@17: 
Chris@17:     \Drupal::service('config.factory')->reset();
Chris@17:     \Drupal::service('state')->resetCache();
Chris@17:   }
Chris@17: 
Chris@17: }