Document how tests are being invoked
Document how tests are being invoked

This aims at helping debugging and ease development experience.

xlqian/navitia,CanalTP/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,Tisseo/navitia,CanalTP/navitia,xlqian/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,CanalTP/navitia,xlqian/navitia,Tisseo/navitia,Tisseo/navitia