public function test_blockdata()
{
$tar = new Tar();
$tar->setCompression(0);
$tar->create();
$tar->addData('block.txt', str_pad('', 512, 'x'));
$file = $tar->getArchive();
$this->assertEquals(512 * 4, strlen($file));
// 1 header block + data block + 2 footer blocks
}
