function testSchedulingMethods()
 {
     $backend = new PDO($this->pdo);
     $calData = "BEGIN:VCALENDAR\r\nEND:VCALENDAR\r\n";
     $backend->createSchedulingObject('principals/user1', 'schedule1.ics', $calData);
     $expected = ['calendardata' => $calData, 'uri' => 'schedule1.ics', 'etag' => '"' . md5($calData) . '"', 'size' => strlen($calData)];
     $result = $backend->getSchedulingObject('principals/user1', 'schedule1.ics');
     foreach ($expected as $k => $v) {
         $this->assertArrayHasKey($k, $result);
         $this->assertEquals($v, $result[$k]);
     }
     $results = $backend->getSchedulingObjects('principals/user1');
     $this->assertEquals(1, count($results));
     $result = $results[0];
     foreach ($expected as $k => $v) {
         $this->assertEquals($v, $result[$k]);
     }
     $backend->deleteSchedulingObject('principals/user1', 'schedule1.ics');
     $result = $backend->getSchedulingObject('principals/user1', 'schedule1.ics');
     $this->assertNull($result);
 }