def test_replace(self):
        d = Delorean(datetime=datetime.datetime(2015, 1, 1, 12, 15), timezone='UTC')
        d.replace(hour=8)

        assert Delorean(datetime=datetime.datetime(2015, 1, 1, 8, 15), timezone='UTC') == d

self = Delorean(datetime=datetime.datetime(2015, 1, 1, 12, 15), timezone='UTC')
name = 'replace'

    def __getattr__(self, name):
        """
            Implement __getattr__ to call `shift_date` function when function
            called does not exist
            """
        func_parts = name.split('_')
        # is the func we are trying to call the right length?
        if len(func_parts) != 2:
>           raise AttributeError
E           AttributeError