Sounds very good, Mirek, but i don't know wether it is possible, because you need to write Testfunctions for all of your methods and new classes you add, so maybee with a subdirectory ... and the functions/packages that will be checked with unit test should be selecteable .... I have eg done test with 10000 loop with random data ... would take a lot of time to check every function of U++ with testcases like that