Test post-processing functionality.
public function testPostProcess() {
$feed = $this
->createFeed(NULL, array(
'refresh' => 1800,
));
$this
->updateFeedItems($feed);
// Reload the feed to get new values.
$feed = entity_load('aggregator_feed', $feed
->id(), TRUE);
// Make sure its refresh rate doubled.
$this
->assertEqual($feed->refresh->value, 3600);
}