function testReadXMLStream()
{
$data = <<<XML
<?xml version="1.0" encoding="utf-8"?>
<icalendar xmlns="urn:ietf:params:xml:ns:icalendar-2.0">
<vcalendar>
</vcalendar>
</icalendar>
XML;
$stream = fopen('php://memory', 'r+');
fwrite($stream, $data);
rewind($stream);
$result = Reader::readXML($stream);
$this->assertInstanceOf('Sabre\\VObject\\Component', $result);
$this->assertEquals('VCALENDAR', $result->name);
$this->assertEquals(0, count($result->children));
}