public function testVeventDtstartMustComeBeforeDtend()
 {
     $this->expectException(new qCal_Exception_InvalidProperty('DTSTART property must come before DTEND'));
     $event = new qCal_Component_Vevent(array('dtstart' => new qCal_Property_Dtstart('09/09/2009'), 'dtend' => new qCal_Property_Dtend('09/08/2009')));
     $event->validate();
 }