django test (nose) stuck after add package fixtures

Question

I have django test run with nosetests.

But after I add package fixtures, python manage.py test can't run as normal and get stuck.

package fixtures (I had minimize it to debug failure reason):

def setup_package():
    pass

def teardown_package():
    pass

And after I run test as normal, the shell get stucked:

$ python manage.py test myapp