What are the best frameworks or tools for automated testing in Android Automotive?
I read about Spectatio but I couldn't find code examples or anything other than what's mentioned on the Android page.
If you look into CATBox documentation, it's based on Spectatio framework. You can build and run catbox from AOSP by following Build CATBox documentation.
BTW, Are you looking for testing framework for your unbundled applications? (which means app will be installed to Android Automotive through Play or else) or, your Android Automotive builds with preinstalled apps?