DeprecatedBackboneTest.php

<?php

namespace Drupal\KernelTests\Core\Asset;

use Drupal\KernelTests\KernelTestBase;

/**
 * Checks the deprecation status of Backbone.
 *
 * @group Asset
 * @group legacy
 */
class DeprecatedBackboneTest extends KernelTestBase {
    
    /**
     * The library discovery service.
     *
     * @var \Drupal\Core\Asset\LibraryDiscoveryInterface
     */
    protected $libraryDiscovery;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->libraryDiscovery = $this->container
            ->get('library.discovery');
    }
    
    /**
     * Tests that the Backbone library is deprecated.
     */
    public function testBackboneDeprecation() {
        $this->libraryDiscovery
            ->getLibraryByName('core', 'backbone');
        $this->expectDeprecation("The core/backbone asset library is deprecated in Drupal 9.4.0 and will be removed in Drupal 10.0.0.");
    }

}