public function testRenderNonPairedElement()
 {
     $element = new DOMElement('input');
     $element->setIsPairTag(false)->setClass('input')->setAttributes(['type' => 'text', 'value' => 'foo']);
     $result = '<input class="input" type="text" value="foo">';
     $this->assertEquals($result, $element->render());
 }