It would be useful to have automated tests checking whether Varnish caching is working correctly.

Goal:
create a simple scenario that verifies that browser contains correct browser headers (with values MISS/HIT) when executing basic actions.

Approach:
1. Switch to ChromeDriver (at least in these tests) as it supports both JavaScript and Response headers (http://mink.behat.org/en/latest/guides/drivers.html)
2. Add possibility to edit Content using BehatBundle
3. Add a BrowserContext to BehatBundle that will allow to visit frontend websites and verify cache responses