ClearCacheBlockTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\system\Functional\Block;

use Drupal\block\BlockInterface;
use Drupal\Tests\BrowserTestBase;

/**
 * Tests clear cache block behavior.
 *
 * @group Block
 *
 * @see \Drupal\system\Plugin\Block\ClearCacheBlock
 */
class ClearCacheBlockTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'block',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * The clear cache block instance.
   *
   * @var \Drupal\block\BlockInterface
   */
  protected BlockInterface $clearCacheBlock;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $admin_user = $this->drupalCreateUser([
      'administer site configuration',
    ]);
    $this->drupalLogin($admin_user);
    $this->clearCacheBlock = $this->placeBlock('system_clear_cache_block', [
      'label' => 'Clear cache block',
    ]);
  }
  
  /**
   * Tests block behavior and access based on permissions.
   */
  public function testCacheClearBlock() : void {
    $this->drupalGet('<front>');
    $this->assertSession()
      ->pageTextContains('Clear cache block');
    $page = $this->getSession()
      ->getPage();
    $page->pressButton('Clear all caches');
    $this->assertSession()
      ->statusMessageContains('Caches cleared.');
    // Confirm that access is not allowed for non-authorized users.
    $this->drupalLogout();
    $this->drupalGet('<front>');
    $this->assertSession()
      ->pageTextNotContains('Clear cache block');
  }

}