Tomas, I really like this idea.
I created a really heavy end-to-end test as an example for a book I co-wrote with Alex Soto. I found myself wanting exactly what you are offering. I didn’t want to confuse the reader with too much information at that point, so ended up providing some JUnit rules to manage the ‘other’ containers.
As microservices really starts to mean something then starting multiple containers of any type is becoming a requirement. Yes, Cube and Docker ‘can’ solve this, but it would still be nice to do it your way when Docker is too much pain.