ThemeEngineExtensionListTest.php

<?php

declare (strict_types=1);
namespace Drupal\KernelTests\Core\Extension;

use Drupal\Core\Extension\ThemeEngineExtensionList;
use Drupal\KernelTests\KernelTestBase;
use PHPUnit\Framework\Attributes\CoversClass;
use PHPUnit\Framework\Attributes\Group;
// cspell:ignore nyan

/**
 * Tests Drupal\Core\Extension\ThemeEngineExtensionList.
 */
class ThemeEngineExtensionListTest extends KernelTestBase {
  
  /**
   * Tests get list.
   *
   * @legacy-covers ::getList
   */
  public function testGetList() : void {
    // Confirm that all theme engines are available.
    $theme_engines = \Drupal::service('extension.list.theme_engine')->getList();
    $this->assertArrayHasKey('twig', $theme_engines);
    $this->assertArrayHasKey('nyan_cat', $theme_engines);
    $this->assertCount(2, $theme_engines);
  }

}