extract auth test fakes

backend/tests/Fakes/FakeHasher.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\PasswordHasher;
+
+class FakeHasher implements PasswordHasher
+{
+    public function hash(string $password): string
+    {
+        return 'hashed-' . $password;
+    }
+
+    public function verify(string $password, string $hash): bool
+    {
+        return $hash === 'hashed-' . $password;
+    }
+}