function testGetDateTimeCached()
 {
     $tz = new \DateTimeZone('Europe/Amsterdam');
     $dt1 = new \DateTime('1985-07-04 01:30:00', $tz);
     $dt2 = new \DateTime('1986-07-04 01:30:00', $tz);
     $dt1->settimezone($tz);
     $dt2->settimezone($tz);
     $elem = new MultiDateTime('DTSTART');
     $elem->setDateTimes(array($dt1, $dt2));
     $this->assertEquals($elem->getDateTimes(), array($dt1, $dt2));
 }