PHPUnit > Best approach to mock container objects? (e.g. $item->id)

I'm using PHPUnit test doubles to mock models, libraries etc. But when I want to return an array perhaps of container objects, how best to do so. Here is what I'm currently doing:

/**
* This is just a mock of the response from http client
*/
class Container {
    public $values;

    public function __construct($values) {
        $this->values = $values;
    }

    public function __get($name) {
        return (isset($values[$name])) ? $values[$name] : null;
    }

    public function __set($name, $value) {
        $values[$name] = $value;
    }
}

.. then in my test* methods I may do something like:

$userMock = new Container(array('id' => 2, 'name'=>'Tom'));
$this->mock
    ->method('find') // called within BaseController
    ->with(2)
    ->willReturn( $userMock );

So I don't know if I can use PHPUnit tets doubles or Mockery to create such classes, can I? It seems simpler to just do this way, is this a good approach though?