public function testRelations()
{
// post
$this->injectDocument(array('title' => 'Test'), array('title' => 'Test', 'site' => array('id' => 123, 'type' => 'Site')));
// site
$this->injectDocument(array('_id' => 123), array('name' => 'Site 1', '_id' => 123));
$site1 = Site::findOne(array('_id' => 123));
$post = BlogPost::findOne(array('title' => 'Test'));
$postSite = $post->site;
$this->assertEquals($site1->id(), $postSite->id());
}