gistfile1.py

from mock import Mock
from functools import wraps

class AuthenticationRequiredError(Exception):
    pass

def authentication_required(fn):
    @wraps(fn)
    def wrapper(self, *args, **kwargs):
        username = hasattr(self, 'username')
        password = hasattr(self, 'password')
        auth_tuple = (username, password)
        if not all(auth_tuple): # only True if all elements are not False-like value
            raise AuthenticationRequiredError
        return fn(self, *args, **kwargs)
    return wrapper


cls = Mock()
cls.__class__.__name__ = 'cls'
cls.username = '123'
cls.password = '456'

authentication_required(cls.method)


====

Traceback (most recent call last):
  File "test_auth.py", line 12, in <module>
    authentication_required(cls.method)
  File "/home/yeukhon/hg/bitbucket-python-api/bitbucket/auth.py", line 7, in authentication_required
    @wraps(fn)
  File "/usr/lib/python2.7/functools.py", line 33, in update_wrapper
    setattr(wrapper, attr, getattr(wrapped, attr))
  File "/home/yeukhon/hg/bbpy/local/lib/python2.7/site-packages/mock.py", line 660, in __getattr__
    raise AttributeError(name)
AttributeError: __name__