protected function _testPartialSyncWithOnlyChangedHbInterval()
{
$this->markTestIncomplete('No idea why the cache does not load the collections here.');
$collections = $this->getCollectionHandler();
$collections->loadCollectionsFromCache();
$collections->setHeartbeat(array('hbinterval' => 1));
$result = $collections->initPartialSync();
$this->assertEquals(true, $result);
}