Add static test to detect blocks without name attribute

Author: ihor-sviziev

dev/tests/static/testsuite/Magento/Test/Integrity/Layout/BlockNamesTest.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * Test block names exists
+ *
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Test\Integrity\Layout;
+
+class BlockNamesTest extends \PHPUnit\Framework\TestCase
+{
+    public function testBlocksHasName()
+    {
+        $invoker = new \Magento\Framework\App\Utility\AggregateInvoker($this);
+        $invoker(
+        /**
+         * Test validate that blocks without name doesn't exist in layout file
+         *
+         * @param string $layoutFile
+         */
+            function ($layoutFile) {
+                $dom = new \DOMDocument();
+                $dom->load($layoutFile);
+                $xpath = new \DOMXpath($dom);
+                $count = $xpath->query('//block[not(@name)]')->length;
+
+                if ($count) {
+                    $this->fail('Following file contains ' . $count . ' blocks without name. ' .
+                        'File Path:' . "\n" . $layoutFile);
+                }
+            },
+            \Magento\Framework\App\Utility\Files::init()->getLayoutFiles()
+        );
+    }
+}