What I Learned Today: Drupal Behat Breakpoints

/**
 * Take screenshot when step fails.
 * Works only with Selenium2Driver.
 *
 * @AfterStep
 */
public function takeScreenshotAfterFailedStep($event)
{
    if (4 === $event->getResult()) {
        $driver = $this->getSession()->getDriver();
        if (!($driver instanceof Selenium2Driver)) {
            //throw new UnsupportedDriverActionException('Taking screenshots is not supported by %s, use Selenium2Driver instead.', $driver);
            return;
        }
        $step = $event->getStep();
        $stepLine = $step->getLine();
        $fileName = '/tmp/stepAtLine' . $stepLine . '.png';
        $screenshot = $driver->getWebDriverSession()->screenshot();
        file_put_contents($fileName, base64_decode($screenshot));
        echo "Saved Screenshot To $fileName \n";
        $fileName = '/tmp/stepAtLine' . $stepLine .'.html';
        $source = $driver->getWebDriverSession()->source();
        file_put_contents($fileName, $source);
        echo "Saved Source To $fileName\n";
    }
}