public function testLoadString() { $xml = '<?xml version="1.0"?><config><node>1</node></config>'; $config = new \Magento\Framework\Simplexml\Config(); $this->assertFalse($config->loadString('')); $this->assertTrue($config->loadString($xml)); $this->assertXmlStringEqualsXmlString($xml, $config->getXmlString()); }