flexmock reproducer

gistfile1.py

from flexmock import flexmock
import unittest

class A:
  def x(self):
    return 'a'

class B(A):
  def x(self):
    return 'b'

class TC(unittest.TestCase):
  def setUp(self):
    self.b = B()

  def test_1(self):
    flexmock(B).should_receive('x').and_return('1')
    print self.b.x()

  def test_2(self):
    print self.b.x()