Automated javascript testing: where we are and what we actually want

First the issue will give a short overview about different kind of testing: Unit vs. Integration/Functional testing

After that let's talk about the current status of testing of our javascript (which will be more and more important in the future).

• Functional testing (is the PHP based approach what we want?)
• How do we integrate javascript unit testing (https://mochajs.org/  | https://jasmine.github.io/) etc.
• Visual regression testing
• How to scale the Drupal testing infrastructure for that