Testing using mock deocorators.

users_test4.py

import unittest
import mock
import users
import file_utils


class UsersTest(unittest.TestCase):
    _file_path = "INSERT_PATH_HERE"

    @mock.patch("file_utils.read_file", return_value="user1")
    def test_get_users(self, mock_read):
        result = users.get_users()
        self.assertEqual("user1", result)
        mock_read.assert_called_once_with(self._file_path)

    def test_get_users_whoops(self):
        print file_utils.read_file


if __name__ == '__main__':
    unittest.main()