Symfony ile içinde behat ile dosya eklentisi olan API şeklindeki istekleri test etmek

parameters:
    upload_dir: %kernel.root_dir%/../src/Application/FrontendBundle/Resources/upload/

Feature: Uploading files as part of request
  In order to upload files
  As a user
  I should be able to send a request that contains message body and files

  Scenario: I can send request with files attached to it
    Given there are dummy files to test
    And I attach files to my request
    Then I send "POST" request to "/message" with body:
    """
    {
      "body": "I also have attachments in this request"
    }
    """

namespace Application\FrontendBundle\Features\Context;

use Behat\Gherkin\Node\PyStringNode;
use Behat\MinkExtension\Context\MinkContext;
use Behat\Symfony2Extension\Context\KernelAwareContext;
use Symfony\Bundle\FrameworkBundle\Client;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Symfony\Component\HttpKernel\KernelInterface;

class FeatureContext extends MinkContext implements KernelAwareContext
{
    const DUMMY_FILE_PNG = 'dummy.png';
    const DUMMY_FILE_DOC = 'dummy.doc';

    private $attachments;

    /** @var KernelInterface */
    private $kernel;

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

    /**
     * @Given /^there are dummy files to test$/
     */
    public function thereAreDummyFilesToTest()
    {
        file_put_contents($this->getCacheTestDir().self::DUMMY_FILE_PNG, 'PNG');
        file_put_contents($this->getCacheTestDir().self::DUMMY_FILE_DOC, 'DOC');
    }

    /**
     * @Then /^I attach files to my request$/
     */
    public function iAttachFilesToMyRequest()
    {
        $this->attachments[] = new UploadedFile(
            $this->getCacheTestDir().self::DUMMY_FILE_PNG,
            self::DUMMY_FILE_PNG,
            'image/png',
            3
        );
        $this->attachments[] = new UploadedFile(
            $this->getCacheTestDir().self::DUMMY_FILE_DOC,
            self::DUMMY_FILE_DOC,
            'application/msword',
            3
        );
    }

    /**
     * @param string $method
     * @param string $url
     * @param PyStringNode $data
     *
     * @Then /^I send "([^"]*)" request to "([^"]*)" with body:$/
     */
    public function iSendRequestWithBody($method, $url, PyStringNode $data)
    {
        /** @var Client $client */
        $client = $this->getSession()->getDriver()->getClient();
        $client->request($method, $url, [], $this->attachments, [], $data);
    }

    /**
     * @return string
     */
    private function getCacheTestDir()
    {
        return $this->kernel->getCacheDir().'/';
    }
}