When\When::byminute PHP Method

    public function byminute($minutes, $delimiter = ",")
    {
        if ($this->byminutes = self::prepareItemsList($minutes, $delimiter, 'minute')) {
            return $this;
        }
        throw new \InvalidArgumentException("byminute: Accepts numeric values between 0 and 59");
    }

 /**
  * @expectedException InvalidArgumentException
  */
 public function testInvalidByMinuteTwo()
 {
     $test = new When();
     $test->byminute('-1, -2');
 }