PHPUnit - Failed test listener

WebTestCase.php

<?php

namespace ClipKit\Test;

/**
 * Base class for the selenium tests
 *
 * @author Serhiy Hlushko <s.hlushko@gmail.com>
 */
abstract class WebTestCase extends \PHPUnit_Framework_TestCase
{
    public function onNotSuccessfulTest(\Exception $e)
    {
        if ($e instanceof \PHPUnit_Framework_ExpectationFailedException
            && getenv('SELENIUM_SCREENSHOT_CAPTURE')
        ) {
            if ($fileUrl = $this->saveCurrentScreenshot()) {
                echo PHP_EOL . PHP_EOL . 'ScreenshotUrl: ' . $fileUrl;
            }
        }
        parent::onNotSuccessfulTest($e);
    }
}