It is 0.9 release. Few of the tests for io_edit() is not implemented yet, but you can start testing your functions while I am implementing the rest of the tests.
Since this is not the final release there may be bugs. If you find any, I'll appreciate if you blog about it here and also send an email to me. (But if you find a bug, make sure it is a bug and not a problem with your assignment)
Happy testing :)