LanguageBrowserDetectionTest.php

<?php

namespace Drupal\Tests\language\Functional;

use Drupal\Core\Url;
use Drupal\Tests\BrowserTestBase;

/**
 * Tests browser language detection.
 *
 * @group language
 */
class LanguageBrowserDetectionTest extends BrowserTestBase {
    protected static $modules = [
        'language',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests mappings between browser language codes and Drupal language codes.
     */
    public function testUIBrowserLanguageMappings() {
        // User to manage languages.
        $admin_user = $this->drupalCreateUser([
            'administer languages',
            'access administration pages',
        ]);
        $this->drupalLogin($admin_user);
        // Check that the configure link exists.
        $this->drupalGet('admin/config/regional/language/detection');
        $this->assertSession()
            ->linkByHrefExists('admin/config/regional/language/detection/browser');
        // Check that defaults are loaded from language.mappings.yml.
        $this->drupalGet('admin/config/regional/language/detection/browser');
        $this->assertSession()
            ->fieldValueEquals('edit-mappings-zh-cn-browser-langcode', 'zh-cn');
        $this->assertSession()
            ->fieldValueEquals('edit-mappings-zh-cn-drupal-langcode', 'zh-hans');
        // Delete zh-cn language code.
        $browser_langcode = 'zh-cn';
        $this->drupalGet('admin/config/regional/language/detection/browser/delete/' . $browser_langcode);
        $this->assertSession()
            ->pageTextContains("Are you sure you want to delete {$browser_langcode}?");
        // Confirm the delete.
        $edit = [];
        $this->drupalGet('admin/config/regional/language/detection/browser/delete/' . $browser_langcode);
        $this->submitForm($edit, 'Confirm');
        $this->assertSession()
            ->statusMessageContains("The mapping for the {$browser_langcode} browser language code has been deleted.", 'status');
        // Check we went back to the browser negotiation mapping overview.
        $this->assertSession()
            ->addressEquals(Url::fromRoute('language.negotiation_browser'));
        // Check that Chinese browser language code no longer exists.
        $this->assertSession()
            ->fieldNotExists('edit-mappings-zh-cn-browser-langcode');
        // Add a new custom mapping.
        $edit = [
            'new_mapping[browser_langcode]' => 'xx',
            'new_mapping[drupal_langcode]' => 'en',
        ];
        $this->drupalGet('admin/config/regional/language/detection/browser');
        $this->submitForm($edit, 'Save configuration');
        $this->assertSession()
            ->addressEquals(Url::fromRoute('language.negotiation_browser'));
        $this->assertSession()
            ->fieldValueEquals('edit-mappings-xx-browser-langcode', 'xx');
        $this->assertSession()
            ->fieldValueEquals('edit-mappings-xx-drupal-langcode', 'en');
        // Add the same custom mapping again.
        $this->drupalGet('admin/config/regional/language/detection/browser');
        $this->submitForm($edit, 'Save configuration');
        $this->assertSession()
            ->statusMessageContains('Browser language codes must be unique.', 'error');
        // Change browser language code of our custom mapping to zh-sg.
        $edit = [
            'mappings[xx][browser_langcode]' => 'zh-sg',
            'mappings[xx][drupal_langcode]' => 'en',
        ];
        $this->drupalGet('admin/config/regional/language/detection/browser');
        $this->submitForm($edit, 'Save configuration');
        $this->assertSession()
            ->statusMessageContains('Browser language codes must be unique.', 'error');
        // Change Drupal language code of our custom mapping to zh-hans.
        $edit = [
            'mappings[xx][browser_langcode]' => 'xx',
            'mappings[xx][drupal_langcode]' => 'zh-hans',
        ];
        $this->drupalGet('admin/config/regional/language/detection/browser');
        $this->submitForm($edit, 'Save configuration');
        $this->assertSession()
            ->addressEquals(Url::fromRoute('language.negotiation_browser'));
        $this->assertSession()
            ->fieldValueEquals('edit-mappings-xx-browser-langcode', 'xx');
        $this->assertSession()
            ->fieldValueEquals('edit-mappings-xx-drupal-langcode', 'zh-hans');
    }

}