dummy datetime mocking (Better use a DUMMY class the is cmp/eq True always)

gistfile1.py

import unittest2 as unittest
from mock import patch
from mock import Mock
from datetime import datetime as dt

class TestMock(unittest.TestCase):
    NOW = datetime.datetime(1970, 1, 1, 0, 0)
    datetime_mock = Mock(side_effect = lambda *args, **kw:
        dt(*args, **kw))
    datetime_mock.now.return_value = NOW


    def setUp(self):
        super(TestMock, self).setUp()
        self.datetime_mock.reset_mock()


    @patch('datetime.datetime', new=datetime_mock)
    def test_foo(self):
        self.assertEqual(
            datetime.datetime(1970, 1, 1, 0, 0),
            datetime.datetime.now())
        self.assertEqual(1, self.datetime_mock.call_count)

    @patch('datetime.datetime', new=datetime_mock)
    def test_bar(self):
        self.assertEqual(
            datetime.datetime(1970, 1, 1, 0, 0),
            datetime.datetime.now())
        self.assertEqual(1, self.datetime_mock.call_count)