ACP2E-3326: added unit test

Author: alzota

app/code/Magento/PageBuilder/Test/Unit/Model/Stage/HtmlFilterTest.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Copyright 2024 Adobe
+ * All Rights Reserved.
+ */
+declare(strict_types=1);
+
+namespace Magento\PageBuilder\Test\Unit\Model\Stage;
+
+use Magento\PageBuilder\Model\Stage\HtmlFilter;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+
+class HtmlFilterTest extends TestCase
+{
+    /**
+     * @var LoggerInterface|MockObject
+     */
+    private $loggerMock;
+
+    /**
+     * @var HtmlFilter
+     */
+    private $htmlFilter;
+
+    protected function setUp(): void
+    {
+        $this->loggerMock = $this->createMock(LoggerInterface::class);
+        $this->htmlFilter = new HtmlFilter($this->loggerMock);
+    }
+
+    public function testFilterHtml()
+    {
+        //test for script tag
+        $inputHtml = '<div><script>alert("test")</script><p>Content</p></div>';
+        $expectedOutput = '<div><p>Content</p></div>';
+
+        $result = $this->htmlFilter->filterHtml($inputHtml);
+        $this->assertEquals($expectedOutput, $result);
+
+        //test for PB placeholder
+        $inputHtml = '
+<div data-content-type="html" data-appearance="default" data-element="main" class="test">
+<div class="block-123">Test</div>
+</div>';
+        $expectedOutput = '
+<div data-content-type="html" data-appearance="default" data-element="main" class="test placeholder-html-code">
+&lt;div class="block-123"&gt;Test&lt;/div&gt;
+</div>';
+
+        $result = $this->htmlFilter->filterHtml($inputHtml);
+        $this->assertEquals($expectedOutput, $result);
+    }
+}