Added unit test validating output of rendertag

Author: basvanpoppel

lib/internal/Magento/Framework/View/Test/Unit/Helper/SecureHtmlRenderer/HtmlRendererTest.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\View\Test\Unit\Helper\SecureHtmlRenderer;
+
+use Magento\Framework\Escaper;
+use Magento\Framework\View\Helper\SecureHtmlRender\HtmlRenderer;
+use Magento\Framework\View\Helper\SecureHtmlRender\TagData;
+use PHPUnit\Framework\TestCase;
+
+class HtmlRendererTest extends TestCase
+{
+    /**
+     * @return void
+     */
+    protected function setUp(): void
+    {
+        $this->escaperMock = $this->createMock(Escaper::class);
+    }
+
+    /**
+     * @covers \Magento\Framework\View\Helper\SecureHtmlRender\HtmlRenderer::renderTag
+     */
+    public function testRenderTag()
+    {
+        $helper = new HtmlRenderer($this->escaperMock);
+
+        /** Test void element to have closing tag */
+        $tag = new TagData('hr', [], null, true);
+        $this->assertEquals(
+            "<hr/>",
+            $helper->renderTag($tag)
+        );
+
+        /** Test void element to never have content */
+        $tag = new TagData('hr', [], 'content', false);
+        $this->assertEquals(
+            "<hr/>",
+            $helper->renderTag($tag)
+        );
+
+        /** Test any non-void element to not have a closing tag and allow content */
+        $tags = new TagData('script', [], 'content', false);
+        $this->assertEquals(
+            "<script>content</script>",
+            $helper->renderTag($tags)
+        );
+    }
+}