class RouteCachingNonPathLanguageNegotiationTest

class RouteCachingNonPathLanguageNegotiationTest extends BrowserTestBase {
  use PathAliasTestTrait;
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'language',
    'block',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * The admin user.
   *
   * @var \Drupal\user\UserInterface
   */
  protected $adminUser;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Create and log in user.
    $this->adminUser = $this->drupalCreateUser([
      'administer blocks',
      'administer languages',
      'access administration pages',
    ]);
    $this->drupalLogin($this->adminUser);
    // Add language.
    ConfigurableLanguage::createFromLangcode('fr')->save();
    // Enable session language detection and selection.
    $edit = [
      'language_interface[enabled][language-url]' => FALSE,
      'language_interface[enabled][language-session]' => TRUE,
    ];
    $this->drupalGet('admin/config/regional/language/detection');
    $this->submitForm($edit, 'Save settings');
    // A more common scenario is domain-based negotiation but that can not be
    // tested. Session negotiation by default is not considered by the URL
    // language type that is used to resolve the alias. Explicitly enable
    // that to be able to test this scenario.
    // @todo Improve in https://www.drupal.org/project/drupal/issues/1125428.
    $this->config('language.types')
      ->set('negotiation.language_url.enabled', [
      'language-session' => 0,
    ])
      ->save();
    // Enable the language switching block.
    $this->drupalPlaceBlock('language_block:' . LanguageInterface::TYPE_INTERFACE, [
      'id' => 'test_language_block',
    ]);
  }
  
  /**
   * Tests aliases when the negotiated language is not in the path.
   */
  public function testAliases() {
    // Switch to French and try to access the now inaccessible block.
    $this->drupalGet('');
    // Create an alias for user/UID just for en, make sure that this is a 404
    // on the french page exist in english, no matter which language is
    // checked first. Create the alias after visiting frontpage to make sure
    // there is no existing cache entry for this that affects the tests.
    $this->createPathAlias('/user/' . $this->adminUser
      ->id(), '/user-page', 'en');
    $this->clickLink('French');
    $this->drupalGet('user-page');
    $this->assertSession()
      ->statusCodeEquals(404);
    // Switch to english, make sure it works now.
    $this->clickLink('English');
    $this->drupalGet('user-page');
    $this->assertSession()
      ->statusCodeEquals(200);
    // Clear cache and repeat the check, this time with english first.
    $this->resetAll();
    $this->drupalGet('user-page');
    $this->assertSession()
      ->statusCodeEquals(200);
    $this->clickLink('French');
    $this->drupalGet('user-page');
    $this->assertSession()
      ->statusCodeEquals(404);
  }

}