added it_delete_user_with_all_data test

app/Services/HelperService.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Services;
+
+use DB;
+use Illuminate\Support\Facades\Storage;
+
+class HelperService
+{
+    /**
+     * Delete all user data including files, folders, avatar etc.
+     *
+     * @param $user
+     */
+    public function erase_user_data($user)
+    {
+        // Delete user avatar if exists
+        if ($user->settings->getRawOriginal('avatar')) {
+            Storage::delete($user->settings->getRawOriginal('avatar'));
+        }
+
+        // Delete all user files
+        Storage::deleteDirectory("files/$user->id");
+
+        // Delete all user records in database
+        collect(['folders', 'files', 'user_settings', 'shares', 'favourite_folder', 'zips'])
+            ->each(function ($table) use ($user) {
+                DB::table($table)
+                    ->whereUserId($user->id)
+                    ->delete();
+            });
+    }
+}