Route::group(['prefix'=>'v1', 'namespace' => 'Api'],function($app){
    Route::get('/test', function(){
        return "HEllo";
    });
    Route::get('test',              'AuthController@test');
});

<?php

namespace AppHttpControllers;

use IlluminateHttpRequest;
use AppHttpControllersController;

class AuthController extends Controller
{


    public function test() {
        return "Hello";
    }
}