public function testCanSetMultipleValuesForSameAttribute()
{
$expected = "<h1 class='one two'>{$this->testContent}</h1>";
$el = new HTMLElement();
$el->setNodeType('h1');
$el->setContent($this->testContent);
$el->class = 'one';
$el->setAttribute('class', 'two');
$this->assertEquals($expected, $el->getNode());
}