public function testClassMerge()
{
$decorator = new HtmlTag('div');
$decorator->setOption('class', 'class');
$toMerge = new HtmlTag(array('class' => 'second'));
$decorator->merge($toMerge);
$expected = '<div class="class second">foo</div>';
$actual = $decorator->render('foo');
$this->assertSame($expected, $actual);
}