LanguageDependencyInjectionTest.php

<?php

namespace Drupal\Tests\language\Kernel;

use Drupal\language\Entity\ConfigurableLanguage;
use Drupal\language\Exception\DeleteDefaultLanguageException;

/**
 * Tests that a language object can be injected.
 *
 * @group language
 */
class LanguageDependencyInjectionTest extends LanguageTestBase {
    
    /**
     * Tests dependency injected languages against a new Language object.
     *
     * @see \Drupal\Core\Language\LanguageInterface
     */
    public function testDependencyInjectedNewLanguage() {
        $expected = $this->languageManager
            ->getDefaultLanguage();
        $result = $this->languageManager
            ->getCurrentLanguage();
        $this->assertSame($expected, $result);
    }
    
    /**
     * Tests dependency injected Language object.
     *
     * @see \Drupal\Core\Language\Language
     */
    public function testDependencyInjectedNewDefaultLanguage() {
        $default_language = ConfigurableLanguage::load(\Drupal::languageManager()->getDefaultLanguage()
            ->getId());
        // Change the language default object to different values.
        $fr = ConfigurableLanguage::createFromLangcode('fr');
        $fr->save();
        $this->config('system.site')
            ->set('default_langcode', 'fr')
            ->save();
        // The language system creates a Language object which contains the
        // same properties as the new default language object.
        $result = \Drupal::languageManager()->getCurrentLanguage();
        $this->assertSame('fr', $result->getId());
        // Delete the language to check that we fallback to the default.
        try {
            $fr->delete();
            $this->fail('Expected DeleteDefaultLanguageException thrown.');
        } catch (DeleteDefaultLanguageException $e) {
            // Expected exception; just continue testing.
        }
        // Re-save the previous default language and the delete should work.
        $this->config('system.site')
            ->set('default_langcode', $default_language->getId())
            ->save();
        $fr->delete();
        $result = \Drupal::languageManager()->getCurrentLanguage();
        $this->assertSame($default_language->getId(), $result->getId());
    }

}