When\When::until PHP Méthode

    public function until($endDate)
    {
        if (Valid::dateTimeObject($endDate)) {
            $this->until = clone $endDate;
            return $this;
        }
        throw new \InvalidArgumentException("until: Accepts valid DateTime objects");
    }

 /**
  * @expectedException InvalidArgumentException
  */
 public function testInvalidUntil()
 {
     $test = new When();
     $test->until("test");
 }