function testGetChanges()
{
$backend = new PDO($this->pdo);
$id = $backend->createCalendar('principals/user1', 'bla', []);
$result = $backend->getChangesForCalendar($id, null, 1);
$this->assertEquals(['syncToken' => 1, 'modified' => [], 'deleted' => [], 'added' => []], $result);
$currentToken = $result['syncToken'];
$dummyTodo = "BEGIN:VCALENDAR\r\nBEGIN:VTODO\r\nEND:VTODO\r\nEND:VCALENDAR\r\n";
$backend->createCalendarObject($id, "todo1.ics", $dummyTodo);
$backend->createCalendarObject($id, "todo2.ics", $dummyTodo);
$backend->createCalendarObject($id, "todo3.ics", $dummyTodo);
$backend->updateCalendarObject($id, "todo1.ics", $dummyTodo);
$backend->deleteCalendarObject($id, "todo2.ics");
$result = $backend->getChangesForCalendar($id, $currentToken, 1);
$this->assertEquals(['syncToken' => 6, 'modified' => ["todo1.ics"], 'deleted' => ["todo2.ics"], 'added' => ["todo3.ics"]], $result);
$result = $backend->getChangesForCalendar($id, null, 1);
$this->assertEquals(['syncToken' => 6, 'modified' => [], 'deleted' => [], 'added' => ["todo1.ics", "todo3.ics"]], $result);
}
/**
* @depends testGetChanges
* @expectedException \InvalidArgumentException
*/
function testGetChangesBadId()
{
$backend = new PDO($this->pdo);
$id = $backend->createCalendar('principals/user1', 'bla', []);
$backend->getChangesForCalendar('bad-id', null, 1);
}