fix leterSendAction

app/Letter/Actions/LetterSendAction.php

@@ -31,7 +31,7 @@ class LetterSendAction
     /**
      * Execute the console command.
      */
-    private function handle(): int
+    public function handle(): int
     {
         foreach (app(DocumentFactory::class)->types as $type) {
             $letters = app(DocumentFactory::class)->repoCollection($type, 'E-Mail');

tests/Feature/Letter/LetterSendActionTest.php

@@ -37,7 +37,7 @@ class LetterSendActionTest extends TestCase
     {
         Mail::fake();
 
-        LetterSendAction::run();
+        app(LetterSendAction::class)->handle();
 
         Mail::assertSent(PaymentMail::class, fn ($mail) => Storage::path('rechnung-fur-mom.pdf') === $mail->filename);
     }