def test_check_month_last_year_calc(self): latest_month = {'date': datetime.strptime('2015-01-01T00:00:00'[:10], '%Y-%m-%d'), 'value': 0} month_last_year = {'date': datetime.strptime('2014-01-01T00:00:00'[:10], '%Y-%m-%d'), 'value': 1} result = DataPoint.check_month_last_year(latest_month, month_last_year) self.assertEquals(result['date'], datetime(2014, 1, 1, 0, 0))