public static function setUpBeforeClass()
{
/* first parameter */
$ultra = Db::forTablePrefix('categories')->create();
$ultra->set(['title' => 'Ultra', 'alias' => 'ultra', 'parent' => 0])->save();
/* second parameter */
$lightweight = Db::forTablePrefix('categories')->create();
$lightweight->set(['title' => 'Lightweight', 'alias' => 'lightweight', 'parent' => $ultra->id()])->save();
/* third parameter */
$cms = Db::forTablePrefix('articles')->create();
$cms->set(['title' => 'CMS', 'alias' => 'cms', 'category' => $lightweight->id()])->save();
}