def test_mock_up_thing(self):
thing = Phonebook()
#<MagicMock id='140115817358032'>
thing.method = MagicMock(return_value=3)
# It is going to return 3
thing.method(3, 4, 5, key='value')
thing.method.assert_called_with(3, 4, 5, key='value')
