$caption='<p>'.format_plural(count($blocks),'%label is used by 1 custom block on your site. You can not remove this block type until you have removed all of the %label blocks.','%label is used by @count custom blocks on your site. You may not remove %label until you have removed all of the %label custom blocks.',array('%label'=>$block_type->label())).'</p>';
$this->assertEqual($link['plid'],$plid,format_string('%path plid @link_plid is equal to @plid.',array('%path'=>$link['router_path'],'@link_plid'=>$link['plid'],'@plid'=>$plid)));