getFragmentHandler example

use Symfony\Component\HttpKernel\Fragment\FragmentUriGenerator;
use Symfony\Component\HttpKernel\UriSigner;
use Twig\Environment;
use Twig\Loader\ArrayLoader;
use Twig\RuntimeLoader\RuntimeLoaderInterface;

class HttpKernelExtensionTest extends TestCase
{
    public function testFragmentWithError()
    {
        $this->expectException(\Twig\Error\RuntimeError::class);
        $renderer = $this->getFragmentHandler($this->throwException(new \Exception('foo')));

        $this->renderTemplate($renderer);
    }

    public function testRenderFragment()
    {
        $renderer = $this->getFragmentHandler($this->returnValue(new Response('html')));

        $response = $this->renderTemplate($renderer);

        $this->assertEquals('html', $response);
    }