[LiveComponent] Tests class merging with whitespaces

src/LiveComponent/tests/Integration/LiveController/LiveControllerTest.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\UX\LiveComponent\Tests\Integration\LiveController;
+
+use Symfony\Component\Panther\PantherTestCase;
+
+/**
+ * @author Alexander Hofbauer <alex@derhofbauer.at>
+ */
+class LiveControllerTest extends PantherTestCase
+{
+    public function testWhitespaceClasses(): void
+    {
+        $client = self::createPantherClient();
+        $client->request('GET', '/whitespace-classes');
+        $client->clickLink('Remove class and render');
+
+        self::assertSelectorAttributeContains('p[id="content"]', 'class', 'second new');
+    }
+}

src/LiveComponent/tests/app/src/Twig/Component/WhitespaceClasses.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Twig\Component;
+
+use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
+use Symfony\UX\LiveComponent\Attribute\LiveAction;
+use Symfony\UX\LiveComponent\Attribute\LiveProp;
+use Symfony\UX\LiveComponent\DefaultActionTrait;
+
+/**
+ * @author Alexander Hofbauer <alex@derhofbauer.at>
+ */
+#[AsLiveComponent('whitespace_classes')]
+final class WhitespaceClasses
+{
+    use DefaultActionTrait;
+
+    #[LiveProp]
+    public string $class = 'third';
+
+    #[LiveAction]
+    public function click(): void
+    {
+        $this->class = 'new';
+    }
+}

src/LiveComponent/tests/app/templates/components/whitespace_classes.html.twig

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+<div{{ attributes }}>
+    <p
+        id="content"
+        class="
+            first
+            second
+            {{ class }}
+        "
+    >
+        <span>Class: {{ class }}</span>
+    </p>
+
+    <a
+        href="#"
+        data-action="live#action"
+        data-live-action-param="click"
+        onclick="document.querySelector('p').classList.remove('first')"
+    >
+        Remove class and render
+    </a>
+</div>

src/LiveComponent/tests/app/templates/whitespace_classes.html.twig

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+{% extends 'base.html.twig' %}
+
+{% block body %}
+    <twig:whitespace_classes />
+{% endblock %}