Presented at DevClub.lv meeting http://devclub.lv/announcing-6th-devclub-lv (video recording of talk is here http://devclub.lv/test-driven-development-tdd-why-and-how-raimonds-simanovskis) and at Agile Tour Vilnius 2013 conference (http://www.agileturas.lt/vilnius#raimonds_simanovskis).