function testCalendarQueryTimeRangeNoEnd()
 {
     $backend = new PDO($this->pdo);
     $backend->createCalendarObject(1, "todo", "BEGIN:VCALENDAR\r\nBEGIN:VTODO\r\nEND:VTODO\r\nEND:VCALENDAR\r\n");
     $backend->createCalendarObject(1, "event", "BEGIN:VCALENDAR\r\nBEGIN:VEVENT\r\nDTSTART:20120101\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n");
     $backend->createCalendarObject(1, "event2", "BEGIN:VCALENDAR\r\nBEGIN:VEVENT\r\nDTSTART:20120103\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n");
     $filters = ['name' => 'VCALENDAR', 'comp-filters' => [['name' => 'VEVENT', 'comp-filters' => [], 'prop-filters' => [], 'is-not-defined' => false, 'time-range' => ['start' => new \DateTime('20120102'), 'end' => null]]], 'prop-filters' => [], 'is-not-defined' => false, 'time-range' => null];
     $this->assertEquals(["event2"], $backend->calendarQuery(1, $filters));
 }