OXDEV-9497 Add UserService test

Signed-off-by: Anton Fedurtsya <anton@fedurtsya.com>

Author: Sieg

src/Greeting/Service/UserService.php

@@ -14,6 +14,8 @@
 
 /**
  * @extendable-class
+ *
+ * @todo: getting the user should go through the user repository
  */
 readonly class UserService implements UserServiceInterface
 {

tests/Integration/Greeting/Service/UserServiceTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Copyright © . All rights reserved.
+ * See LICENSE file for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Greeting\Service;
+
+use OxidEsales\EshopCommunity\Tests\Integration\IntegrationTestCase;
+use OxidEsales\ExamplesModule\Extension\Model\User;
+use OxidEsales\ExamplesModule\Greeting\Infrastructure\UserModelFactoryInterface;
+use OxidEsales\ExamplesModule\Greeting\Service\UserService;
+use PHPUnit\Framework\Attributes\Test;
+
+final class UserServiceTest extends IntegrationTestCase
+{
+    public function setUp(): void
+    {
+        // @todo: its a temporary hack for broken autoloader solution 9474. Remove this when the case is solved.
+        oxNew(User::class);
+    }
+
+    #[Test]
+    public function getUserByIdLoadsUserAndReturnsIt(): void
+    {
+        $userId = uniqid();
+
+        $userModelSpy = $this->createMock(User::class);
+        $userModelSpy->expects($this->once())
+            ->method('load')
+            ->with($userId);
+
+        $userModelFactoryMock = $this->createConfiguredStub(UserModelFactoryInterface::class, [
+            'create' => $userModelSpy,
+        ]);
+
+        $sut = new UserService(
+            userModelFactory: $userModelFactoryMock
+        );
+
+        $result = $sut->getUserById($userId);
+        $this->assertSame($userModelSpy, $result);
+    }
+}