Learned that I should not refer to env vars directly so I removed all references.

app/Factory/TransactionFactory.php

@@ -50,7 +50,7 @@ class TransactionFactory
      */
     public function __construct()
     {
-        if ('testing' === env('APP_ENV')) {
+        if ('testing' === config('app.env')) {
             Log::warning(sprintf('%s should not be instantiated in the TEST environment!', \get_class($this)));
         }
     }