After a Behat javascript scenario fails, taking a screenshot then sending it to wsend as an anonymous user. (could be improved, juste a POC really)

ScreenshotContext.php

<?php

namespace Context;

use Behat\MinkExtension\Context\RawMinkContext;
use Behat\Testwork\Tester\Result\TestResult;
use Behat\Mink\Driver\Selenium2Driver;

class ScreenshotContext extends RawMinkContext
{
    protected $scenarioTitle = null;
    protected static $wsendUser = null;

    /**
     * @BeforeScenario
     */
    public function keepScenarioTitle($event)
    {
        $this->scenarioTitle = $event->getScenario()->getTitle();
    }

    /**
     * @AfterStep
     */
    public function takeScreenshotAfterFailedStep($event)
    {
        if ($event->getTestResult()->getResultCode() !== TestResult::FAILED) {
            return;
        }

        $this->takeAScreenshot();
    }

    /**
     * @Then take a screenshot
     */
    public function takeAScreenshot()
    {
        if (!$this->getSession()->getDriver() instanceof Selenium2Driver) {
            print "Screenshot cannot be taken from non javascript scenario.";

            return;
        }

        $screenshot = $this->getSession()->getDriver()->getScreenshot();

        $filename = $this->getScreenshotFilename();
        file_put_contents($filename, $screenshot);

        $url = $this->sendScreenshot($filename);

        print sprintf("Screenshot is available :\n%s", $url);
    }

    protected function sendScreenshot($filename)
    {
        if (!self::$wsendUser) {
            self::$wsendUser = $this->getWsendUser();
        }

        exec(sprintf(
            'curl -F "uid=%s" -F "filehandle=@%s" https://wsend.net/upload_cli 2>/dev/null',
            self::$wsendUser,
            $filename
        ), $output, $return);

        if ($return !== 0) {
            throw new \RuntimeException('Sending screenshot failed : '.implode("\n", $output));
        }

        return $output[0];
    }

    protected function getWsendUser()
    {
        exec('curl -F "start=1" https://wsend.net/createunreg 2>/dev/null', $output, $return);

        if ($return !== 0) {
            throw new \RuntimeException('Sending screenshot failed : '.implode("\n", $output));
        }

        return $output[0];
    }

    protected function getScreenshotFilename()
    {
        $filename = $this->scenarioTitle;
        $filename = preg_replace("#[^a-zA-Z0-9\._-]#", '_', $filename);

        return sprintf('%s/%s.png', sys_get_temp_dir(), $filename);
    }
}