ExpressionExtension example

use PHPUnit\Framework\TestCase;
use Symfony\Bridge\Twig\Extension\ExpressionExtension;
use Twig\Environment;
use Twig\Loader\ArrayLoader;

class ExpressionExtensionTest extends TestCase
{
    public function testExpressionCreation()
    {
        $template = "{{ expression('1 == 1') }}";
        $twig = new Environment(new ArrayLoader(['template' => $template]), ['debug' => true, 'cache' => false, 'autoescape' => 'html', 'optimizations' => 0]);
        $twig->addExtension(new ExpressionExtension());

        $output = $twig->render('template');
        $this->assertEquals('1 == 1', $output);
    }
}