public function testGetWebDriverSessionId()
 {
     /** @var Selenium2Driver $driver */
     $driver = $this->getSession()->getDriver();
     $this->assertNotEmpty($driver->getWebDriverSessionId(), 'Started session has an ID');
     $driver = new Selenium2Driver();
     $this->assertNull($driver->getWebDriverSessionId(), 'Not started session don\'t have an ID');
 }