create( \Magento\Framework\View\Layout\Reader\Context::class ); $pageXml = new \Magento\Framework\View\Layout\Element(__DIR__ . '/_files/_layout_update.xml', 0, true); $parentElement = new \Magento\Framework\View\Layout\Element(''); $html = new Html(); foreach ($pageXml->xpath('html') as $htmlElement) { $html->interpret($readerContext, $htmlElement, $parentElement); } $structure = $readerContext->getPageConfigStructure(); $this->assertEquals(['html' => ['test-name' => 'test-value']], $structure->getElementAttributes()); } }