Fixed tests

Author: rennokki

tests/TestCase.php

@@ -274,7 +274,7 @@ protected function configurePubSub()
 
         // Replace the publish and subscribe clients with a Mocked
         // factory lazy instance on boot.
-        $this->app->singleton(ReplicationInterface::class, function () {
+        $this->app->singleton(ReplicationInterface::class, function () use ($replicationDriver) {
             $client = config(
                 "websockets.replication.{$replicationDriver}.client",
                 \BeyondCode\LaravelWebSockets\PubSub\Drivers\LocalClient::class