add test for rendering embedded components as live

Author: kbond

src/LiveComponent/tests/Fixtures/templates/render_embedded.html.twig

@@ -0,0 +1,2 @@
+{% component component2 %}
+{% endcomponent %}

src/LiveComponent/tests/Integration/EventListener/AddLiveAttributesSubscriberTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Symfony\UX\LiveComponent\Tests\Integration\EventListener;
+
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Symfony\UX\TwigComponent\EventListener\PreRenderEvent;
+use Twig\Environment;
+use Twig\Error\RuntimeError;
+
+/**
+ * @author Kevin Bond <[email protected]>
+ */
+final class AddLiveAttributesSubscriberTest extends KernelTestCase
+{
+    public function testCannotUseEmbeddedComponentAsLive(): void
+    {
+        if (!method_exists(PreRenderEvent::class, 'isEmbedded')) {
+            $this->markTestSkipped('Embedded components not available.');
+        }
+
+        $twig = self::getContainer()->get(Environment::class);
+
+        $this->expectException(RuntimeError::class);
+        $this->expectExceptionMessage('Embedded components cannot be live.');
+
+        $twig->render('render_embedded.html.twig');
+    }
+}