/**
  * Returns Session ID of WebDriver or `null`, when session not started yet.
  *
  * @return string|null
  */
 public function getWebDriverSessionId()
 {
     return $this->isStarted() ? basename($this->wdSession->getUrl()) : null;
 }
 /**
  * Returns current URL address.
  *
  * @return  string
  */
 public function getCurrentUrl()
 {
     return $this->wdSession->getUrl();
 }