Frontline save screenshots on error

<?php

/**
 * @file
 * Provides code to handle failures in circleci.
 */

use Behat\Behat\Hook\Scope\AfterStepScope;
use Behat\Mink\Driver\Selenium2Driver;
use Behat\MinkExtension\Context\RawMinkContext;
use Behat\Gherkin\Node\FeatureNode;

class ErrorHandlingContext extends RawMinkContext {
  /**
   * If there are errors on circleci, save a screenshot.
   *
   * @param AfterStepScope $event
   *   AfterStepScope event object.
   *
   * @AfterStep
   */
  public function printLastResponseOnError(AfterStepScope $event) {
    if (!$event->getTestResult()->isPassed()) {
      $this->saveDebugScreenshot($event->getFeature());
    }
  }

  /**
   * Save an error screenshot.
   *
   * @param FeatureNode $feature
   *   FeatureNode feature object.
   *
   * @Then /^save screenshot$/
   */
  public function saveDebugScreenshot(FeatureNode $feature) {
    $driver = $this->getSession()->getDriver();

    if (!$driver instanceof Selenium2Driver) {
      return;
    }

    $filename = basename($feature->getFile()) . '_' . microtime(TRUE) . '.png';
    $this->saveScreenshot($filename, '/tmp/behat_screenshots');
  }
}