atk4\data\tests\ReferenceTest::testModelProperty PHP Method

    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);
    }