Introduce browser-less testing in the tutorial #1685
Description
We should consider introducing the new TestBench browser-less testing (aka UI Unit Testing) in the tutorial. The latter now only covers:
- Unit and Integration testing in general, without covering the possibility of UI unit testing
- End-to-end testing (or browser-based testing)
Given the speed and reliability of browser-less testing, we should also consider mentioning it in the tutorial.