public function createZipArchive()
{
$zip = new ZipArchive();
$this->assertTrue($zip->open(vfsStream::url('root/test.zip'), ZipArchive::CREATE));
$this->assertTrue($zip->addFromString("testfile1.txt", "#1 This is a test string added as testfile1.txt.\n"));
$this->assertTrue($zip->addFromString("testfile2.txt", "#2 This is a test string added as testfile2.txt.\n"));
$zip->setArchiveComment('a test');
var_dump($zip);
$this->assertTrue($zip->close());
var_dump($zip->getStatusString());
var_dump($zip->close());
var_dump($zip->getStatusString());
var_dump($zip);
var_dump(file_exists(vfsStream::url('root/test.zip')));
}