public function setUp()
{
$this->sut = Extractor::fromHtml(<<<HTML
<html>
\t<body>
\t\t<span class="s1">foo</span>
\t\t<div class="c1">
\t\t\t<div>xxx</div>
\t\t\t<div>
\t\t\t\t<span>yyy</span>
\t\t\t\t<span>zzz</span>
\t\t\t\t<span class="s1">baz</span>
\t\t\t</div>
\t\t</div>
\t</body>
</html>
HTML
);
}