[Pharo-project] Who is working on which tests? Why are there new, broken tests?

I looked at the wiki page http://code.google.com/p/pharo/wiki/CurrentlyWorkingOn but it does not say much. I would like to work through some tests, but I cannot find an overview. The tests CharacterTest>>testHex and IntegerTest>>testHex are broken but seem to be very new. Stef, are you working on these? You seem to have written the tests ... - on