add fake token generator

tests/Fakes/FakeTokenGenerator.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\TokenGenerator;
+
+class FakeTokenGenerator implements TokenGenerator
+{
+    private int $callCount = 0;
+
+    /**
+     * @param string[] $predefinedTokens
+     */
+    public function __construct(
+        private array $predefinedTokens = ['fake-token-0'],
+    ) {}
+
+    public function generate(): string
+    {
+        $index = $this->callCount % count($this->predefinedTokens);
+        $this->callCount++;
+
+        return $this->predefinedTokens[$index];
+    }
+}