users and institutions route, tests fixed

backend/app/Http/Controllers/UserPositionController.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Traits\ApiResponse;
+use App\Models\Lists\UserPosition;
+use Illuminate\Http\JsonResponse;
+
+class UserPositionController extends Controller
+{
+    use ApiResponse;
+
+    /**
+     * Elenco delle position.
+     */
+    public function index(): JsonResponse
+    {
+        return $this->collectionResponse(UserPosition::all());
+    }
+
+    /**
+     * Dettaglio di una position.
+     */
+    public function show(UserPosition $userPosition): JsonResponse
+    {
+        return $this->okResponse($userPosition);
+    }
+}