Test Guzzle

Hola! tengo un problema con el test:

Es el consumo de una api con autenticación. No tengo problemas en obtener los datos el problema es en el test
que me da error.

Clase que consume cliente guzzle:

namespace App\Repositories;
use GuzzleHttp\Client;

class Communes
{
    public function get()
    {

        $client = new Client([
            'base_uri' => 'https://api.shipit.cl/v/',
        ]);

        $headers = [
            'Content-Type' => 'application/json' ,
            'X-Shipit-Email' => 'prueba_front@shipit.cl',
            'X-Shipit-Access-Token' => 'MWhEAdkHKYdscen_4cxR',
            'Accept'        => 'application/vnd.shipit.v2',
        ];

        $reponse = $client->request('GET', 'communes',[
            'headers' => $headers
        ]);

        return json_decode($reponse->getBody()->getContents());
    }

}

Controlador:

namespace App\Http\Controllers;
use App\Repositories\Communes;

class CommunesController extends Controller
{
    protected $communes;

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

    public function  index(){
        $comunas = $this->communes->get();
        return view('welcome',compact('comunas'));
    }
}

test:

/**
 * @test
 */
 public function shipit_communes(){

    $this->withHeaders([
         'Content-Type' => 'application/json' ,
         'X-Shipit-Email' => 'prueba_front@shipit.cl',
         'X-Shipit-Access-Token' => 'MWhEAdkHKYdscen_4cxR',
         'Accept' => 'application/vnd.shipit.v2',
       ])->json('GET', 'https://api.shipit.cl/v/communes')
         ->assertStatus(200);
   }

error:

Expected status code 200 but received 404.
Failed asserting that false is true.