How to use the nose2.util.call_with_args_if_expected function in nose2

def tearDown(self):
                for func in teardowns:
                    util.call_with_args_if_expected(func, self)
            attr['tearDown'] = tearDown

def setUp(cls):
            for func in cls.setups:
                util.call_with_args_if_expected(func, self)

def setUp(self):
                for func in setups:
                    util.call_with_args_if_expected(func, self)
            attr['setUp'] = setUp

def tearDown(cls):
            for func in cls.teardowns:
                util.call_with_args_if_expected(func, self)

def __call__(self, testcase, *args):
        # ... only if it takes an arg
        self._helper = testcase
        util.call_with_args_if_expected(self.func, testcase, *args)