TwigExtension example

use Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer;
use Symfony\Component\Form\FormRenderer;
use Symfony\Component\Mailer\Mailer;
use Symfony\Component\Stopwatch\Stopwatch;
use Twig\Environment;

class TwigExtensionTest extends TestCase
{
    public function testLoadEmptyConfiguration()
    {
        $container = $this->createContainer();
        $container->registerExtension(new TwigExtension());
        $container->loadFromExtension('twig');
        $this->compileContainer($container);

        $this->assertEquals(Environment::class, $container->getDefinition('twig')->getClass(), '->load() loads the twig.xml file');

        $this->assertContains('form_div_layout.html.twig', $container->getParameter('twig.form.resources'), '->load() includes default template for form resources');

        // Twig options         $options = $container->getDefinition('twig')->getArgument(1);
        $this->assertEquals('%kernel.cache_dir%/twig', $options['cache'], '->load() sets default value for cache option');
        $this->assertEquals('%kernel.charset%', $options['charset'], '->load() sets default value for charset option');
        

  protected function setUp(): void {
    parent::setUp();

    $this->renderer = $this->createMock('\Drupal\Core\Render\RendererInterface');
    $this->urlGenerator = $this->createMock('\Drupal\Core\Routing\UrlGeneratorInterface');
    $this->themeManager = $this->createMock('\Drupal\Core\Theme\ThemeManagerInterface');
    $this->dateFormatter = $this->createMock('\Drupal\Core\Datetime\DateFormatterInterface');
    $this->fileUrlGenerator = $this->createMock(FileUrlGeneratorInterface::class);

    $this->systemUnderTest = new TwigExtension($this->renderer, $this->urlGenerator, $this->themeManager, $this->dateFormatter, $this->fileUrlGenerator);
  }

  /** * Tests the escaping. * * @dataProvider providerTestEscaping */
  public function testEscaping($template, $expected) {
    $loader = new FilesystemLoader();
    $twig = new Environment($loader, [
      'debug' => TRUE,