mock_example_python2.7.xx

mock_example1.py

import unittest
from os import urandom
import mock


def simple_urandom(length):
    return 'f' * length


class TestRandom(unittest.TestCase):
    @mock.patch('__main__.urandom', side_effect=simple_urandom)
    def test_urandom(self, urandom_function):
        assert urandom(5) == 'fffff'
		
		
# from 
# http://fgimian.github.io/blog/2014/04/10/using-the-python-mock-library-to-fake-regular-functions-during-tests/