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);
    }

}