symfony-flex-recipes/behat/symfony2-extension/2.1/features/bootstrap/FeatureContext.php

<?php

use Behat\Behat\Context\Context;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\KernelInterface;

class FeatureContext implements Context
{
    /**
     * @var KernelInterface
     */
    private $kernel;

    /**
     * @var Response|null
     */
    private $response;

    public function __construct(KernelInterface $kernel)
    {
        $this->kernel = $kernel;
    }

    /**
     * @When a demo scenario sends a request to :path
     */
    public function aDemoScenarioSendsARequestTo(string $path)
    {
        $this->response = $this->kernel->handle(Request::create($path, 'GET'));
    }

    /**
     * @Then the response should be received
     */
    public function theResponseShouldBeReceived()
    {
        assert($this->response !== null);
    }
}