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

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Test\Integrity\Modular;
+
+class EventConfigFilesTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var string
+     */
+    protected $_schemaFile;
+
+    protected function setUp(): void
+    {
+        $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+        $this->_schemaFile = $objectManager->get(\Magento\Framework\Event\Config\SchemaLocator::class)->getSchema();
+    }
+
+    /**
+     * @param string $file
+     * @dataProvider eventConfigFilesDataProvider
+     */
+    public function testEventConfigFiles($file)
+    {
+        $errors = [];
+        $validationStateMock = $this->createMock(\Magento\Framework\Config\ValidationStateInterface::class);
+        $validationStateMock->method('isValidationRequired')
+            ->willReturn(true);
+        $dom = new \Magento\Framework\Config\Dom(file_get_contents($file), $validationStateMock);
+        $result = $dom->validate($this->_schemaFile, $errors);
+        $message = "Invalid XML-file: {$file}\n";
+        foreach ($errors as $error) {
+            $message .= "{$error->message} Line: {$error->line}\n";
+        }
+        $this->assertTrue($result, $message);
+    }
+
+    /**
+     * @return array
+     */
+    public function eventConfigFilesDataProvider()
+    {
+        return \Magento\Framework\App\Utility\Files::init()->getConfigFiles('{*/events.xml,events.xml}');
+    }
+}