ConfigurableLanguageValidationTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\language\Kernel;

use Drupal\KernelTests\Core\Config\ConfigEntityValidationTestBase;
use Drupal\language\Entity\ConfigurableLanguage;

/**
 * Tests validation of configurable_language entities.
 *
 * @group language
 */
class ConfigurableLanguageValidationTest extends ConfigEntityValidationTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'language',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->entity = ConfigurableLanguage::createFromLangcode('fr');
        $this->entity
            ->save();
    }

}