I have one question : all the examples in the part of the tutorial for setting up the development environment (i.e sudo apt-get install rerun ruby-foreman apt-cacher-ng|moreutils lighttpd rabbitmq-server) are relative to the specific package of 'rubby'? So when i want to set up the environment for running test in another package i will have to change these commands accordingly?I suspect apt-cacher-ng is in there as a performance enhancement.apt-cacher-ng can help speed frequent rebuilding of packages because it can download and store locally packages.When you're first starting to test build an application you'd do:apt source <package name>apt build-dep <package name>cd <package directory>dpkg-buildpackage(with the stretch release they added apt as an improvement to apt-get)Debian maintianers will usually build packages in a temporary environment using tools like pbuilder or sbuild. Those tools automate extracting the package, installing the dependencies, building, and running tests. It's just a bit of work to get them setup.And it looks like autopkgtest expects to be running in a temporary build environment so it can install things and change the system configuration.Hope that helpsDiane