Update makefile, tweak topictest

tests/Broker/TopicTest.php

@@ -5,6 +5,7 @@ namespace NoccyLabs\Mercureact\Broker;
 use PHPUnit\Framework\Attributes\CoversClass;
 
 #[CoversClass(Topic::class)]
+#[CoversClass(Message::class)]
 class TopicTest extends \PHPUnit\Framework\TestCase
 {
 
@@ -64,4 +65,4 @@ class TopicTest extends \PHPUnit\Framework\TestCase
         $this->assertEquals(0, count($unauthorizedSubscriber->messages));
     }
 
-}
+}