ClearTest.php

<?php

namespace Drupal\Tests\system\Functional\Cache;


/**
 * Tests our clearing is done the proper way.
 *
 * @group Cache
 */
use Drupal\Component\Render\FormattableMarkup;
use Drupal\Core\Cache\Cache;
class ClearTest extends CacheTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    $this->defaultBin = 'render';
    $this->defaultValue = $this->randomMachineName(10);
    parent::setUp();
  }
  
  /**
   * Tests drupal_flush_all_caches().
   */
  public function testFlushAllCaches() {
    // Create cache entries for each flushed cache bin.
    $bins = Cache::getBins();
    $this->assertNotEmpty($bins, 'Cache::getBins() returned bins to flush.');
    foreach ($bins as $bin => $cache_backend) {
      $cid = 'test_cid_clear' . $bin;
      $cache_backend->set($cid, $this->defaultValue);
    }
    // Remove all caches then make sure that they are cleared.
    drupal_flush_all_caches();
    foreach ($bins as $bin => $cache_backend) {
      $cid = 'test_cid_clear' . $bin;
      $this->assertFalse($this->checkCacheExists($cid, $this->defaultValue, $bin), new FormattableMarkup('All cache entries removed from @bin.', [
        '@bin' => $bin,
      ]));
    }
  }

}