public function testAuthor($fileName)
{
$content = $this->getContent($fileName);
$item = $this->getItem($content);
$expected = $this->getFirstValueFromXpath($content, "*/ns:email");
$this->assertEquals($expected, $item->getAuthor(), 'Fail asserting that first element of ' . $fileName . ' has author "' . $expected . '"');
}