LanguageNegotiationSessionTest.php

<?php

namespace Drupal\Tests\language\Functional;

use Drupal\language\Entity\ConfigurableLanguage;
use Drupal\Tests\BrowserTestBase;

/**
 * Tests the session language negotiation method.
 *
 * @group language
 */
class LanguageNegotiationSessionTest extends BrowserTestBase {
    
    /**
     * An administrative user to configure the test environment.
     *
     * @var \Drupal\user\Entity\User
     */
    protected $adminUser;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'language',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create a new user with permission to manage the languages.
        $this->adminUser = $this->drupalCreateUser([
            'administer languages',
        ]);
        $this->drupalLogin($this->adminUser);
        ConfigurableLanguage::createFromLangcode('fr')->save();
    }
    
    /**
     * Tests language negotiation via query/session parameters.
     */
    public function testSessionLanguageNegotiationMethod() {
        // Enable Session and Selected language for interface language detection.
        $this->drupalGet('admin/config/regional/language/detection');
        $edit = [
            'language_interface[enabled][language-session]' => 1,
            'language_interface[enabled][language-selected]' => 1,
            'language_interface[weight][language-session]' => -6,
            'language_interface[weight][language-selected]' => 12,
        ];
        $this->submitForm($edit, 'Save settings');
        // Set language via query parameter.
        $this->drupalGet('user/' . $this->adminUser
            ->id(), [
            'query' => [
                'language' => 'fr',
            ],
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->responseHeaderEquals('Content-language', 'fr');
        // Verify that the language is persisted in the session.
        $this->drupalGet('user/' . $this->adminUser
            ->id());
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->responseHeaderEquals('Content-language', 'fr');
        // Set language via query parameter.
        $this->drupalGet('user/' . $this->adminUser
            ->id(), [
            'query' => [
                'language' => 'en',
            ],
        ]);
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->responseHeaderEquals('Content-language', 'en');
        // Verify that the language is persisted in the session.
        $this->drupalGet('admin/config/regional/language');
        $this->assertSession()
            ->statusCodeEquals(200);
        $this->assertSession()
            ->responseHeaderEquals('Content-language', 'en');
    }

}