add unit tests for user and auth

backend/tests/Unit/Auth/UseCases/LogoutTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Tests\Unit\Auth\UseCases;
+
+use App\Auth\UseCases\Logout\Logout;
+use App\Shared\ValueObject\EmailAddress;
+use App\User\User;
+use PHPUnit\Framework\TestCase;
+use Tests\Fakes\FakeSessionRepository;
+
+class LogoutTest extends TestCase
+{
+    private FakeSessionRepository $sessionRepo;
+    private Logout $logout;
+
+    protected function setUp(): void
+    {
+        $this->sessionRepo = new FakeSessionRepository();
+        $this->logout = new Logout($this->sessionRepo);
+    }
+
+    public function testDeletesSessionByToken(): void
+    {
+        $email = new EmailAddress('user@example.com');
+        $user = new User(1, $email, 'hashed-password');
+
+        $session = $this->sessionRepo->create(new \App\Auth\CreateSessionDto(
+            'session-token',
+            $user,
+            new \DateTimeImmutable(),
+            new \DateTimeImmutable('+1 hour')
+        ));
+
+        $this->logout->execute('session-token');
+
+        $this->assertNull($this->sessionRepo->findByToken('session-token'));
+    }
+}