old_contents: from unittest.case import TestCase
  
  from mock import Mock
  
  from robber import expect
  from robber.matchers.called import Called
  
  
  class TestCalled(TestCase):
      def test_matches(self):
          mock = Mock()
          mock()
          expect(Called(mock).matches()) == True
  
      def test_failure_message(self):
          mock = Mock()
          called = Called(mock)
          message = called.failure_message()
          expect(message) == 'Expected {function} to be called'.format(function=mock)
  
      def test_register(self):
          expect(expect.matcher('called')) == Called
          expect(expect.matcher('__called__')) == Called
  
      def test_not_a_mock(self):
          with self.assertRaises(TypeError):
              expect(Called("a").matches()) == True
          with self.assertRaises(TypeError):
              expect(Called(1).matches()) == True
  
new_contents: from unittest import TestCase
  
  from mock import Mock
  
  from robber import expect
  from robber.matchers.called import Called
  
  
  class TestCalled(TestCase):
      def test_matches(self):
          mock = Mock()
          mock()
          expect(Called(mock).matches()) == True
  
      def test_failure_message(self):
          mock = Mock()
          called = Called(mock)
          message = called.failure_message()
          expect(message) == 'Expected {function} to be called'.format(function=mock)
  
      def test_register(self):
          expect(expect.matcher('called')) == Called
          expect(expect.matcher('__called__')) == Called
  
      def test_not_a_mock(self):
          with self.assertRaises(TypeError):
              expect(Called("a").matches()) == True
          with self.assertRaises(TypeError):
              expect(Called(1).matches()) == True
  
subject: Make import compatible with python 2.6