I was speaking about automated tests: unit and integration testing approach. See description here: https://www.meetup.com/Warszawa-JUG/events/258813049/
It was a very good meeting! The room was full and we had interesting discussions during that evening.
Video is here (in Polish)
And materials (slides + source code) here: https://github.com/yacekmm/testingDemo
Looks OK! 