drupal screenshot on test failure

FeatureContext.php

<?php
  // Extracted from FeatureContext.php in Behat.
  // This may also require a Behat patch?
  
  /** @AfterStep */
  public function takeScreenshotOnFail(Behat\Behat\Hook\Scope\AfterStepScope $scope) {
    if (99 === $scope->getTestResult()->getResultCode()) {
      $this->takeScreenshot(true);
    }
  }

  /**
   * Take a screenshot of the current page.
   *
   * Images for Goutte require X server & wkhtmlto*, so disabled here, and
   * dump .html instead.
   *
   * @Given /^I take a screenshot$/
   */
  public function takeScreenshot($fail = FALSE) {
    // @see https://gist.github.com/Quilted/1ac94e717b50c486b3ed
    // @see https://github.com/Behat/Behat/issues/649
    $driver = $this->getSession()->getDriver();
    $filepath = $this->getMinkParameter('files_path' ) . '/debug';
    if ($fail) {
      $filename = sprintf('%s_%s_%s-FAIL', $this->getMinkParameter('browser_name'), date('c'), uniqid('', true));
    }
    else {
      $filename = sprintf('%s_%s_%s-DEBUG', $this->getMinkParameter('browser_name'), date('c'), uniqid('', true));
    }
    if (method_exists($driver, 'saveScreenshot')) {
      $this->saveScreenshot($filename . '.png', $filepath);
    }
    else {
      switch (get_class($driver)) {
        case 'Behat\Mink\Driver\GoutteDriver':
          $html = $this->getSession()->getDriver()->getContent();
          // @todo: process file to ensure all links/images have full domain...
          $url = $this->getSession()->getCurrentUrl();
          $scheme = parse_url($url, PHP_URL_SCHEME);
          $host = parse_url($url, PHP_URL_HOST);
          $html = str_replace('src="/', 'src="' . $scheme . '://' . $host . '/', $html);
          // $filepath = $filepath ? $filepath : (ini_get('upload_tmp_dir') ? ini_get('upload_tmp_dir') : sys_get_temp_dir());
          $file_markup = $filepath . '/' . $filename . '.html';
          file_put_contents($file_markup, $html);
          // Generate screenshot.
          $file_image = $filepath . '/' . $filename . '.png';
          // exec("wkhtmltoimage $file_markup $file_image");
          break;

      }
    }
    print 'Screenshot at: ' . $file_markup . PHP_EOL;
  }