test: couverture 100% ServiceLog (8/8 methods, 13/13 lines)

ServiceLogTest (2 tests) :
- testConstructorDefaults : id null, service, fromStatus, toStatus, source=manual,
  changedBy null, createdAt
- testConstructorWithSourceAndUser : source=cron, changedBy=User

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Entity/ServiceLogTest.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Tests\Entity;
+
+use App\Entity\Service;
+use App\Entity\ServiceCategory;
+use App\Entity\ServiceLog;
+use App\Entity\User;
+use PHPUnit\Framework\TestCase;
+
+class ServiceLogTest extends TestCase
+{
+    private function createService(): Service
+    {
+        return new Service('Esy-Web', 'esy-web', new ServiceCategory('Web', 'web'));
+    }
+
+    public function testConstructorDefaults(): void
+    {
+        $service = $this->createService();
+        $log = new ServiceLog($service, 'up', 'down');
+
+        $this->assertNull($log->getId());
+        $this->assertSame($service, $log->getService());
+        $this->assertSame('up', $log->getFromStatus());
+        $this->assertSame('down', $log->getToStatus());
+        $this->assertSame('manual', $log->getSource());
+        $this->assertNull($log->getChangedBy());
+        $this->assertInstanceOf(\DateTimeImmutable::class, $log->getCreatedAt());
+    }
+
+    public function testConstructorWithSourceAndUser(): void
+    {
+        $service = $this->createService();
+        $user = new User();
+        $user->setEmail('admin@test.com');
+        $user->setFirstName('A');
+        $user->setLastName('B');
+        $user->setPassword('h');
+
+        $log = new ServiceLog($service, 'down', 'up', 'cron', $user);
+
+        $this->assertSame('cron', $log->getSource());
+        $this->assertSame($user, $log->getChangedBy());
+    }
+}