Issue #3479160 by longwave, catch, fjgarlin, nod_: 11.0.x yarn dependencies have mushroomed

<?php

declare(strict_types=1);

namespace Drupal\Tests\ckeditor5\Unit;

use Drupal\Tests\UnitTestCase;

/**

 * @group ckeditor5

 * @internal

 */

class VersionTest extends UnitTestCase {

  /**

   * Ensure that CKEditor5 versions are aligned.

   */

  public function testVersionAlignment(): void {

    $package_json = json_decode(file_get_contents(__DIR__ . '/../../../../../package.json'), TRUE);

    $ckeditor_dependencies = array_filter($package_json['devDependencies'], fn ($key) => str_starts_with($key, '@ckeditor/ckeditor5-'), ARRAY_FILTER_USE_KEY);

    $this->assertCount(1, array_unique($ckeditor_dependencies));

  }

}