public function testUpdate()
{
$s = new Sql(Db::factory('Sqlite', array('database' => __DIR__ . '/../tmp/test.sqlite')), 'users');
$s->update(array('username' => 'newuser'))->orderBy('id')->limit(1);
$this->assertEquals('UPDATE "users" SET "username" = \'newuser\' ORDER BY "id" ASC LIMIT 1', $s->render(true));
}