add unit tests for user and auth

backend/tests/Fakes/FakeUserRepository.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Shared\ValueObject\EmailAddress;
+use App\User\CreateUserDto;
+use App\User\User;
+use App\User\UserRepository;
+
+class FakeUserRepository implements UserRepository
+{
+    private array $usersById = [];
+    private array $usersByEmail = [];
+
+    public function create(CreateUserDto $dto): User
+    {
+        $id = count($this->usersById) + 1;
+        $user = new User($id, $dto->email, $dto->passwordHash);
+        $this->usersById[$id] = $user;
+        $this->usersByEmail[$dto->email->value()] = $user;
+
+        return $user;
+    }
+
+    public function findByEmail(EmailAddress $email): ?User
+    {
+        if (! isset($this->usersByEmail[$email->value()])) {
+            return null;
+        }
+
+        $stored = $this->usersByEmail[$email->value()];
+
+        return new User(
+            $stored->getId(),
+            $stored->getEmail(),
+            $stored->getPasswordHash()
+        );
+    }
+
+    public function findByEmailDomain(string $domain): array
+    {
+        $result = [];
+        foreach ($this->usersByEmail as $email => $stored) {
+            if (str_ends_with($email, '@' . $domain)) {
+                $result[] = new User(
+                    $stored->getId(),
+                    $stored->getEmail(),
+                    $stored->getPasswordHash()
+                );
+            }
+        }
+
+        return $result;
+    }
+
+    public function find(int $id): ?User
+    {
+        if (! isset($this->usersById[$id])) {
+            return null;
+        }
+
+        $stored = $this->usersById[$id];
+
+        return new User(
+            $stored->getId(),
+            $stored->getEmail(),
+            $stored->getPasswordHash()
+        );
+    }
+}