protected function _startcallback(CacheAbstract $cache)
{
$key = new CacheKey("startcallback", 1);
$cache->clean($key);
$this->assertFalse($cache->start($key));
echo "something ";
$this->assertTrue($cache->appendCallback('callbackTesterStart'));
echo " otherthing";
$output = $cache->end(false);
$this->assertContains(CALLBACKVALUE, $output);
// run again, we should have another value
$second = $cache->start($key, null, false);
$this->assertNotFalse($second);
$this->assertContains(CALLBACKVALUE, $second);
$this->assertNotEquals($second, $output);
}