add fake clock

tests/Fakes/FakeClock.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\Clock;
+use DateTimeImmutable;
+
+class FakeClock implements Clock
+{
+    public function __construct(
+        private DateTimeImmutable $currentTime,
+    ) {}
+
+    public function now(): DateTimeImmutable
+    {
+        return $this->currentTime;
+    }
+
+    public function setTime(DateTimeImmutable $newTime): void
+    {
+        $this->currentTime = $newTime;
+    }
+}