Setting up and running the Aurora test suite

[nagisa]

In order to run the Aurora test suite (on Ubuntu):

1. Make sure you have a recent version (^12.0 is the requirement, I believe) of nodejs and node-yarn installed. In particular, note that the packages provided by Ubuntu are too old and won't work. For yarn I used instructions here;
2. Make sure docker is installed and that you're able to run docker ps – this may require adding your user to the docker group (sudo usermod -aG docker $USER);
3. After cloning the repository, run make check.