PhpUnit + Selenium WebDriver

SeleniumServer.php

<?php

class SeleniumServer
{
    private $downloadUrl = 'http://selenium-release.storage.googleapis.com/2.40/selenium-server-standalone-2.40.0.jar';
    private $jarLocation;
    private $process;

    public function __constuct($location = null, $downloadUrl = null)
    {
        if ($downloadUrl) {
            $this->downloadUrl = $downloadUrl;
        }

        if ($location) {
            $this->jarLocation = $location;
        } else {
            $this->jarLocation = __DIR__ . DIRECTORY_SEPARATOR . basename($this->downloadUrl);
        }
    }

    public function start()
    {
        if (!file_exists($this->jarLocation))
            $this->download();

        $this->process = proc_open(
            'java -jar selenium-server-standalone-2.40.0.jar',
            array(
                0 => array('pipe', 'r'),
                1 => array('pipe', 'w'),
                2 => array('pipe', 'a'),
            ),
            $pipes
        );

        while ($str = fgets($pipes[1])) {
            if (strpos($str, 'Started SocketListener') !== false)
                break;
        }
    }

    public function stop()
    {
        if ($this->process)
            proc_terminate($this->process);
    }

    public function download()
    {
        $jarContents = file_get_contents($this->downloadUrl);
        file_put_contents($this->jarLocation, $jarContents);
    }
}

WebTest.php

<?php

require_once 'SeleniumServer.php';

class WebTest extends PHPUnit_Framework_TestCase
{
    /**
     * @var \WebDriver\Session
     */
    protected static $session;

    public static function setUpBeforeClass()
    {
        static::startSession();
    }

    public static function tearDownAfterClass()
    {
        static::stopSession();
    }

    protected function setUp()
    {

    }

    public function testTitle()
    {
        $session = $this->getSession();
        $session->open('http://ya.ru/');
        $this->assertEquals('Яндекс', $session->title());
        $this->assertNotEmpty($session->element('css selector', '[type=submit]'));
    }

    /**
     * @expectedException WebDriver\Exception\Timeout
     */
    public function testLocalhost()
    {
        $session = $this->getSession();
        $session->open('http://localhost/');
        $session->element('css selector', 'body');
        $session->timeouts()->wait(function () { return false; }, 2, 5);
    }

    /**
     * @return \WebDriver\Session
     */
    protected function getSession()
    {
        return static::$session;
    }

    protected static function startSession()
    {
        static::ensureSeleniumServerRun();
        $webDriver = new WebDriver\WebDriver();
        if (!static::$session)
            static::$session = $webDriver->session('firefox');
    }

    protected static function stopSession()
    {
        if (static::$session) {
            static::$session->close();
            static::$session = null;
        }
    }

    protected static function restartSession()
    {
        static::stopSession();
        static::startSession();
    }

    private static function ensureSeleniumServerRun()
    {
        try {
            $webDriver = new WebDriver\WebDriver();
            $webDriver->status();
        } catch (WebDriver\Exception\CurlExec $e) {
            $seleniumServer = new SeleniumServer();
            $seleniumServer->start();
        }
    }
}