ENGCOM-7278: Fix #24656: allow 'group' attribute on referenceBlock layout XML element #27575

 - Merge Pull Request #27575 from korostii/magento2:korostii-patch-24656
 - Merged commits:
   1. 20a97cd
   2. d1126e7
   3. 5c7e2cd
   4. fa49d55

Author: magento-engcom-team

dev/tests/integration/testsuite/Magento/Test/Integrity/Modular/LayoutConfigFilesTest.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Test\Integrity\Modular;
+
+class LayoutConfigFilesTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * Path to schema file
+     *
+     * @var string
+     */
+    protected $schemaFile;
+
+    protected function setUp()
+    {
+        $urnResolver = new \Magento\Framework\Config\Dom\UrnResolver();
+        $this->schemaFile = $urnResolver->getRealPath('urn:magento:framework:View/Layout/etc/elements.xsd');
+    }
+
+    /**
+     * Test a valid layout XML file
+     */
+    public function testValidLayoutXmlFile()
+    {
+        $validationStateMock = $this->createMock(\Magento\Framework\Config\ValidationStateInterface::class);
+        $validationStateMock->method('isValidationRequired')->willReturn(true);
+        $domConfig = new \Magento\Framework\Config\Dom(
+            '<referenceBlock name="product.info.something" group="column_left"></referenceBlock>',
+            $validationStateMock
+        );
+        $result = $domConfig->validate($this->schemaFile, $errors);
+        $this->assertTrue($result);
+        $this->assertEmpty($errors);
+    }
+
+    /**
+     * Test a layout XML file having an invalid tag element
+     */
+    public function testBrokenLayoutXmlFile()
+    {
+        $validationStateMock = $this->createMock(\Magento\Framework\Config\ValidationStateInterface::class);
+        $validationStateMock->method('isValidationRequired')->willReturn(true);
+        $domConfig = new \Magento\Framework\Config\Dom(
+            '<invalidElement name="some.name"></invalidElement>',
+            $validationStateMock
+        );
+        $result = $domConfig->validate($this->schemaFile, $errors);
+        $this->assertFalse($result);
+        $this->assertNotEmpty($errors);
+    }
+}

lib/internal/Magento/Framework/View/Layout/etc/elements.xsd

@@ -328,6 +328,7 @@
         <xs:attribute type="elementNameType" name="name" use="required"/>
         <xs:attribute type="xs:string" name="template" use="optional"/>
         <xs:attribute type="xs:string" name="class" use="optional"/>
+        <xs:attribute type="xs:string" name="group" use="optional"/>
         <xs:attribute type="xs:boolean" name="display" default="true" use="optional"/>
         <xs:attribute type="xs:boolean" name="remove" use="optional"/>
     </xs:complexType>