Update makefile, tweak topictest

Makefile

@@ -20,4 +20,12 @@ phar: ## Build .phar using pharlite
 
 .PHONY: phpstan
 phpstan: ## Run static analysis
-	phpstan --no-progress
+	@phpstan --no-progress
+
+.PHONY: phpunit
+phpunit: ## Run unit tests
+	@phpunit --testdox --no-progress
+
+.PHONY: coverage
+coverage: ## Code coverage
+	@XDEBUG_MODE=coverage phpunit --coverage-text --no-progress

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
 {