No sessions in testing environment?

Hi,

The code below (system\Session\Session.php) appears to block sessions when your environment is set to testing 

Code:

/**
* Starts the session.
* Extracted for testing reasons.
*/
protected function startSession()
{
  if (ENVIRONMENT === 'testing')
  {
    $_SESSION = [];
    return;
  }

  session_start(); // @codeCoverageIgnore
}