Laravel phpunit test issue offsetExists() does not exist on this mock object

I'm having an issue with phpunit and mockery to test my laravel controller.It always returning an error of:

BadMethodCallException: Method Mockery_4_Illuminate_Http_Request::offsetExists() does not exist on this mock object

here's my controller:

class ImageController extends Controller{
    protected $imageRepository;
    protected $authorizationKey;

    public function __contruct(ImageRepository $imageRepository){
        $this->imageRepository = $imageRepository;
    }

    public function getImage(Request $request){
        //i think error comes on this line
        $this->authorizationKey = (new AuthKey())->getAuthKey($request->token);

        $images = $this->imageRepository->getByCategory($request->image_category, $request->limit);

        return $images;
    }
}

and here's my test:

public function test_images_get(){
    $imageRepo = Mockery::mock(ImageRepository::class);

    $request = Mockery::mock(Request::class, function($request){
        $request->shouldReceive('offsetGet')->with('limit')->andReturn(10);
        $request->shouldReceive('offsetGet')->with('image_category')->andReturn('Houses');
        $request->shouldReceive('offsetGet')->with('token')->andReturn('234asjkdhf293');
    });

    $imageController = new ImageController($imageRepo);
    $response = $imageController->getImage($request);
}

Anyone have an idea to fix? Thanks in advance.

via Cris