add unit tests for user and auth

backend/tests/Fakes/FakeSessionRepository.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\CreateSessionDto;
+use App\Auth\Session;
+use App\Auth\SessionRepository;
+use DateTimeImmutable;
+
+class FakeSessionRepository implements SessionRepository
+{
+    private array $sessionsByToken = [];
+
+    public function create(CreateSessionDto $dto): Session
+    {
+        $session = new Session(
+            $dto->token,
+            $dto->user,
+            $dto->createdAt,
+            $dto->expiresAt
+        );
+        $this->sessionsByToken[$dto->token] = $session;
+
+        return $session;
+    }
+
+    public function findByToken(string $token): ?Session
+    {
+        if (! isset($this->sessionsByToken[$token])) {
+            return null;
+        }
+
+        $stored = $this->sessionsByToken[$token];
+
+        return new Session(
+            $stored->getToken(),
+            $stored->getUser(),
+            $stored->getCreatedAt(),
+            $stored->getExpiresAt()
+        );
+    }
+
+    public function deleteByToken(string $token): void
+    {
+        unset($this->sessionsByToken[$token]);
+    }
+}