public function testModelProperty()
{
$db = new Persistence();
$user = new Model($db, ['table' => 'user']);
$user->id = 1;
$user->hasOne('order_id', ['model' => ['atk4/data/Model', 'table' => 'order']]);
$o = $user->ref('order_id');
$this->assertEquals('order', $o->table);
}