protected function _testEmptyResponse()
{
$cache = new Horde_ActiveSync_SyncCache(self::$state, 'dev123', 'mike', self::$logger->getLogger());
// Reset these from other tests.
$cache->hbinterval = 100;
$cache->save();
$collections = $this->getCollectionHandler();
// False since we don't have hangingSync.
$this->assertEquals(false, $collections->canSendEmptyResponse());
$collections->hangingSync = true;
$this->assertEquals(true, $collections->canSendEmptyResponse());
$collections->importedChanges = true;
$this->assertEquals(false, $collections->canSendEmptyResponse());
}