LanguageConfigFactoryOverrideTest.php

<?php

namespace Drupal\Tests\language\Kernel;

use Drupal\language\Entity\ConfigurableLanguage;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests \Drupal\language\Config\LanguageConfigFactoryOverride.
 *
 * @group language
 */
class LanguageConfigFactoryOverrideTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'system',
        'language',
    ];
    
    /**
     * Tests language.config_factory_override service has the default language.
     */
    public function testLanguageConfigFactoryOverride() {
        $this->installConfig('system');
        $this->installConfig('language');
        
        /** @var \Drupal\language\Config\LanguageConfigFactoryOverride $config_factory_override */
        $config_factory_override = \Drupal::service('language.config_factory_override');
        $this->assertEquals('en', $config_factory_override->getLanguage()
            ->getId());
        ConfigurableLanguage::createFromLangcode('de')->save();
        // Invalidate the container.
        $this->config('system.site')
            ->set('default_langcode', 'de')
            ->save();
        $this->container
            ->get('kernel')
            ->rebuildContainer();
        $config_factory_override = \Drupal::service('language.config_factory_override');
        $this->assertEquals('de', $config_factory_override->getLanguage()
            ->getId());
    }

}