unittest dependencies

[urielka]

i am using unittest to test a project,and one thing i really want is a
way to say that test a depends on test b,so it need to run before it
and be successful in order to run this test.

i just wanted to know if anyone have done it before(i searched for it
but didn`t find something useful),i think it can be done easily using
a decorator that will run the test which is depend on and mark it as
successful,the only problem will be detecting circular test
dependencies,but that can be fixed by keeping all the functions that
the decorator have seen.

what do you guys think? did someone did it before?