add more controllers and fix tests

app/Services/Email/EmailAttachmentService.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Services\Email;
+
+use Illuminate\Http\UploadedFile;
+
+class EmailAttachmentService
+{
+    public function normalize($files): array
+    {
+        if ($files instanceof UploadedFile) {
+            $files = [$files];
+        }
+        if (!is_array($files)) {
+            return [];
+        }
+
+        $out = [];
+        foreach ($files as $file) {
+            if (!$file instanceof UploadedFile || !$file->isValid()) {
+                continue;
+            }
+            $path = $file->getRealPath();
+            if (!$path || !is_file($path)) {
+                continue;
+            }
+            $out[] = [
+                'path' => $path,
+                'name' => $file->getClientOriginalName(),
+            ];
+        }
+
+        return $out;
+    }
+}