update .env.example to include redis config

fix broken test

.env.example

@@ -13,5 +13,7 @@ DB_PASSWORD=jqbdui1bdb
 CACHE_DRIVER=redis
 QUEUE_DRIVER=sync
 
+REDIS_HOST=redis
+REDIS_PORT=6379
 
 IATACODE_API_KEY=8105c628-a86c-41af-85da-828bcf8190e0

app/Http/Controllers/FlightController.php

@@ -101,6 +101,6 @@ class FlightController extends Controller
             $deleted = $flight->delete();
         }
 
-        return response()->json(['message' => "flight $id has been removed"], 200);
+        return response()->json('', 204);
     }
 }

tests/acceptance/FlightsCest.php

@@ -136,6 +136,7 @@ class FlightsCest
         $I->sendDELETE($uri);
 
         $I->seeResponseCodeIs(204);
+        $I->seeResponseEquals('');
     }
 
     private function getFirstTripId(AcceptanceTester $I)