ISPN-2932 Verify that preloading a read only index in a cache will never...

... hit the cacheloader

https://issues.jboss.org/browse/ISPN-2932



Not sure if I follow, once the index on disk is gone (line 40), any access via cache loader will cause the test to fail with FileNotFoundException. That's how the chunk size bug got exposed :)
Good point about Windows, it's probably better to instrument the test rather than used files.