I got your point. I thought was a good idea to test more cases considering the little amount of code needed. 

If we delete `cache_*` files I think we have to change the value for `max-age` here https://github.com/hpatoio/FOSHttpCache/blob/nginx/tests/Functional/Fixtures/web/cache.php#L2 otherwise the tests that check the cache expiration https://github.com/hpatoio/FOSHttpCache/blob/nginx/tests/Functional/NginxTest.php#L36 will be slow.  

So:

1) Shall I delete the Nginx related files and the code in the tests ?
2) Is it ok if I change the `max-age` so the expires tests run faster ?

Let me know.