Convert all existing tests to the latest technologies

History of Convert all existing tests to the latest technologies — revisions from 1.2 to 5.2
From	To	Version	Editor	Date	Summary
From	To	5.2	Vincent Massol	2022/02/25 09:25	Updated class property name
From	To	4.2	Vincent Massol	2022/02/25 09:22	Updated class property name
From	To	3.1	Vincent Massol	2022/02/25 09:18	Migrated property [difficulty] from class [GoogleSummerOfCode.ProjectClass]
From	To	2.1	Vincent Massol	2015/02/20 09:45
From	To	1.2	Eduard Moraru	2015/02/19 11:10