Laravel unable to test job with mocked Service and object. The Mockery spy fails to detect called method

I want to test my functionality of my Job:

namespace App\Jobs;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use App\Model\Model;
use App\Services\Service;

class MyJob implements ShouldQueue
{
    use Dispatchable;
    use InteractsWithQueue;
    use Queueable;

    /**
     * Undocumented variable
     *
     * @var User
     */
    private $model;

    public function __construct(Model $model)
    {