protected function _callback(CacheAbstract $cache)
{
$base = 'callback';
$key1 = new CacheKey($base, 1);
$cache->clean($key1);
$this->assertEquals(CALLBACKVALUE, $cache->startCallback($key1, 'callbackTester'));
try {
$data = $cache->getData($key1);
$this->assertEquals(CALLBACKVALUE, $data->stringify($cache));
} catch (Cachearium\Exceptions\NotCachedException $e) {
$this->fail();
}
}