Source of frocate.com - pragmatic programming tasks platform
Frocate is a platform with programming tasks. It tries to be different from others by focusing on real life task solving environment - use any 3rd party libraries you want, google whatever you want - just provide the solution.
Since sometimes it is difficult to debug your solution when it is run on remote host and you only can view logs - we provide full source of tests here. Perhaps it will help on your path to knowledge.
Good luck and have fun solving tasks!