I would like to develop GNOME Shell extensions and found it's really easy to step into the development process but I still can't figure out how to debug / test my extensions effectively.
Are there any tools for that purpose? Is there any kind of real time console like we have on modern browsers or javascript servers environments?
Yes, the real-time console is called "Looking Glass" and can be started by pressing Alt+F2 and typing lg
at the prompt.