public function testWriteShufflingGroup()
{
$shufflingGroup = new ShufflingGroup(new IdentifierCollection(array('id1', 'id2', 'id3')));
$shufflingGroup->setFixedIdentifiers(new IdentifierCollection(array('id2')));
$stream = new MemoryStream();
$stream->open();
$access = new QtiBinaryStreamAccessFsFile($stream);
$access->writeShufflingGroup($shufflingGroup);
$stream->rewind();
$shufflingGroup = $access->readShufflingGroup();
$this->assertEquals(array('id1', 'id2', 'id3'), $shufflingGroup->getIdentifiers()->getArrayCopy());
$this->assertEquals(array('id2'), $shufflingGroup->getFixedIdentifiers()->getArrayCopy());
}
