public function testExistingXml()
{
// default is null
$this->assertEquals(null, $this->fixture->getExistingXml());
$this->fixture->setExistingXml('<?xml version="1.0" ?><project version="1.0"></project>');
$this->assertInstanceOf('DOMDocument', $this->fixture->getExistingXml());
$this->assertEquals('1.0', $this->fixture->getExistingXml()->documentElement->getAttribute('version'));
}