human
Solve the following python programming problem given the following code:
@ patch ('os.path.isfile', MagicMock (return_value = True)) 
def test_push_success(self) : 
    '
        Test if push succeeds.
        ' 
    path = '/srv/salt/saltines' 
    file_data = '' 
    mock_buf_size = len (file_data) 
    mock_id = "You don't need to see his identification." 
    ret = True 
    class MockChannel (object) : 
        @ staticmethod 
        def factory(__opts__) : 
            return MockChannel () 
def send(self, load) : 
            return 'channel info' 
class MockAuth (object) : 
        def gen_token(self, salt) : 
            return 'token info' 
def mock_auth_factory() : 
        return MockAuth () 
with patch ('salt.transport.Channel', MockChannel) : 
        with patch ('salt.modules.cp._auth', <MASK>) : 
            with patch ('salt.utils.fopen', mock_open (read_data = file_data)) : 
                with patch.dict (cp.__opts__, { 
                    'file_buffer_size' : mock_buf_size, 
                    'id' : mock_id, 
}) : 
                    self.assertEqual (cp.push (path), ret) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def mock_auth_factory(